Author: "Gesa, L" - Searchworks@Jio Institute Digital Library Search Results

Your search keyword '"Gesa, L"' showing total 270 results

Start Over Author "Gesa, L"

270 results on '"Gesa, L"'

1. Tilt-to-length coupling in LISA Pathfinder: long-term stability

Author: Armano, M, Audley, H, Baird, J, Binetruy, P, Born, M, Bortoluzzi, D, Castelli, E, Cavalleri, A, Cesarini, A, Cruise, A M, Danzmann, K, Silva, M de Deus, Diepholz, I, Dixon, G, Dolesi, R, Ferraioli, L, Ferroni, V, Fitzsimons, E D, Freschi, M, Gesa, L, Giardini, D, Gibert, F, Giusteri, R, Grimani, C, Grzymisch, J, Harrison, I, Hartig, M-S, Heinzel, G, Hewitson, M, Hollington, D, Hoyland, D, Hueller, M, Inchauspé, H, Jennrich, O, Jetzer, P, Johann, U, Johlander, B, Karnesis, N, Kaune, B, Killow, C J, Korsakova, N, Lobo, J A, López-Zaragoza, J P, Maarschalkerweerd, R, Mance, D, Martín, V, Martin-Polo, L, Martin-Porqueras, F, Martino, J, McNamara, P W, Mendes, J, Mendes, L, Meshksar, N, Nofrarias, M, Paczkowski, S, Perreur-Lloyd, M, Petiteau, A, Plagnol, E, Ramos-Castro, J, Reiche, J, Rivas, F, Robertson, D I, Russano, G, Sanjuan, J, Slutsky, J, Sopuerta, C F, Sumner, T, Texier, D, Thorpe, J I, Vetrugno, D, Vitale, S, Wanner, G, Ward, H, Wass, P J, Weber, W J, Wissel, L, Wittchen, A, and Zweifel, P
Subjects: Astrophysics - Instrumentation and Methods for Astrophysics
Abstract: The tilt-to-length coupling during the LISA Pathfinder mission has been numerically and analytically modeled for particular timespans. In this work, we investigate the long-term stability of the coupling coefficients of this noise. We show that they drifted slowly (by 1\,$\mu$m/rad and 6$\times10^{-6}$ in 100 days) and strongly correlated to temperature changes within the satellite (8\,$\mu$m/rad/K and 30$\times10^{-6}$/K). Based on analytical TTL coupling models, we attribute the temperature-driven coupling changes to rotations of the test masses and small distortions in the optical setup. Particularly, we show that LISA Pathfinder's optical baseplate was bent during the cooldown experiment, which started in late 2016 and lasted several months.
Published: 2024
Full Text: View/download PDF

2. Precision measurements of the magnetic parameters of LISA Pathfinder test masses

Author: Armano, M, Audley, H, Baird, J, Binetruy, P, Born, M, Bortoluzzi, D, Castelli, E, Cavalleri, A, Cesarini, A, Cruise, A M, Danzmann, K, Silva, M De Deus, Diepholz, I, Dixon, G, Dolesi, R, Ferraioli, L, Ferroni, V, Fitzsimons, E D, Freschi, M, Gesa, L, Giardini, D, Gibert, F, Giusteri, R, Grimani, C, Grzymisch, J, Harrison, I, Hartig, M S, Heinzel, G, Hewitson, M, Hollington, D, Hoyland, D, Hueller, M, Inchauspé, H, Jennrich, O, Jetzer, P, Karnesis, N, Kaune, B, Korsakova, N, Killow, C J, Liu, L, Lobo, J A, López-Zaragoza, J P, Maarschalkerweerd, R, Mance, D, Martín, V, Martino, J, Martin-Polo, L, Martin-Porqueras, F, McNamara, P W, Mendes, J, Mendes, L, Meshksar, N, Nofrarias, M, Paczkowski, S, Perreur-Lloyd, M, Petiteau, A, Pivato, P, Plagnol, E, Ramos-Castro, J, Reiche, J, Rivas, F, Robertson, D I, Russano, G, Sala, L, Serrano, D, Slutsky, J, Sopuerta, C F, Sumner, T, Texier, D, Thorpe, J I, Vetrugno, D, Vitale, S, Wanner, G, Ward, H, Wass, P, Weber, W J, Wissel, L, Wittchen, A, and Zweifel, P
Subjects: Astrophysics - Instrumentation and Methods for Astrophysics, General Relativity and Quantum Cosmology
Abstract: A precise characterization of the magnetic properties of LISA Pathfinder free falling test-masses is of special interest for future gravitational wave observatory in space. Magnetic forces have an important impact on the instrument sensitivity in the low frequency regime below the millihertz. In this paper we report on the magnetic injection experiments performed throughout LISA Pathfinder operations. We show how these experiments allowed a high precision estimate of the instrument magnetic parameters. The remanent magnetic moment was found to have a modulus of $(0.245\pm0.081)\,\rm{nAm}^2$, the x-component of the background magnetic field within the test masses position was measured to be $(414 \pm 74)$ nT and its gradient had a value of $(-7.4\pm 2.1)\,\mu$T/m. Finally, we also measured the test mass magnetic susceptibility to be $(-3.35\pm0.15)\times$10$^{-5}$ in the low frequency regime. All results are in agreement with on-ground estimates.
Published: 2024

3. Magnetic-induced force noise in LISA Pathfinder free-falling test masses

Author: Armano, M, Audley, H, Baird, J, Binetruy, P, Born, M, Bortoluzzi, D, Castelli, E, Cavalleri, A, Cesarini, A, Cruise, A M, Danzmann, K, Silva, M De Deus, Diepholz, I, Dixon, G, Dolesi, R, Ferraioli, L, Ferroni, V, Fitzsimons, E D, Freschi, M, Gesa, L, Giardini, D, Gibert, F, Giusteri, R, Grimani, C, Grzymisch, J, Harrison, I, Hartig, M S, Heinzel, G, Hewitson, M, Hollington, D, Hoyland, D, Hueller, M, Inchauspé, H, Jennrich, O, Jetzer, P, Karnesis, N, Kaune, B, Korsakova, N, Killow, C J, Liu, L, Lobo, J A, López-Zaragoza, J P, Maarschalkerweerd, R, Mance, D, Martín, V, Martino, J, Martin-Polo, L, Martin-Porqueras, F, McNamara, P W, Mendes, J, Mendes, L, Meshksar, N, Nofrarias, M, Paczkowski, S, Perreur-Lloyd, M, Petiteau, A, Pivato, P, Plagnol, E, Ramos-Castro, J, Reiche, J, Rivas, F, Robertson, D I, Russano, G, Sala, L, Serrano, D, Slutsky, J, Sopuerta, C F, Sumner, T, Texier, D, Thorpe, J I, Vetrugno, D, Vitale, S, Wanner, G, Ward, H, Wass, P, Weber, W J, Wissel, L, Wittchen, A, and Zweifel, P
Subjects: Astrophysics - Instrumentation and Methods for Astrophysics, General Relativity and Quantum Cosmology
Abstract: LISA Pathfinder was a mission designed to test key technologies required for gravitational wave detection in space. Magnetically driven forces play a key role in the instrument sensitivity in the low-frequency regime, which corresponds to the measurement band of interest for future space-borne gravitational wave observatories. Magnetic-induced forces couple to the test mass motion, introducing a contribution to the relative acceleration noise between the free falling test masses. In this Letter we present the first complete estimate of this term of the instrument performance model. Our results set the magnetic-induced acceleration noise during the February 2017 noise run of $\rm 0.25_{-0.08}^{+0.15}\,fm\,s^{-2}/\sqrt{Hz}$ at 1 mHz and $\rm 1.01_{-0.24}^{+0.73}\, fm\,s^{-2}/\sqrt{Hz}$ at 0.1 mHz. We also discuss how the non-stationarities of the interplanetary magnetic field can affect these values during extreme space weather conditions.
Published: 2024

4. In-depth analysis of LISA Pathfinder performance results: Time evolution, noise projection, physical models, and implications for LISA

Author: Armano, M., Audley, H., Baird, J., Binetruy, P., Born, M., Bortoluzzi, D., Castelli, E., Cavalleri, A., Cesarini, A., Chiavegato, V., Cruise, A. M., Bosco, D. Dal, Danzmann, K., Silva, M. De Deus, Diepholz, I., Dixon, G., Dolesi, R., Ferraioli, L., Ferroni, V., Fitzsimons, E. D., Freschi, M., Gesa, L., Giardini, D., Gibert, F., Giusteri, R., Grimani, C., Grzymisch, J., Harrison, I., Hartig, M. S., Heinzel, G., Hewitson, M., Hollington, D., Hoyland, D., Hueller, M., Inchauspé, H., Jennrich, O., Jetzer, P., Johlander, B., Karnesis, N., Kaune, B., Korsakova, N., Killow, C. J., Lobo, J. A., Lopez-Zaragoza, J. P., Maarschalkerweerd, R., Mance, D., Martın, V., Martin-Polo, L., Martin-Porqueras, F., Martino, J., McNamara, P. W., Mendes, J., Mendes, L., Meshksar, N., Nofrarias, M., Paczkowski, S., Perreur-Lloyd, M., Petiteau, A., Plagnol, E., Ramos-Castro, J., Reiche, J., Rivas, F., Robertson, D. I., Russano, G., Sala, L., Slutsky, J., Sopuerta, C. F., Sumner, T., Texier, D., Thorpe, J. I., Vetrugno, D., Vitale, S., Wanner, G., Ward, H., Wass, P., Weber, W. J., Wissel, L., Wittchen, A., Zanoni, C., and Zweifel, P.
Subjects: Astrophysics - Instrumentation and Methods for Astrophysics
Abstract: We present an in-depth analysis of the LISA Pathfinder differential acceleration performance over the entire course of its science operations, spanning approximately 500 days. We find that: 1) the evolution of the Brownian noise that dominates the acceleration amplitude spectral density (ASD), for frequencies $f\gtrsim 1\,\text{mHz}$, is consistent with the decaying pressure due to the outgassing of a single gaseous species. 2) between $f=36\,\mu\text{Hz}$ and $1\,\text{mHz}$, the acceleration ASD shows a $1/f$ tail in excess of the Brownian noise of almost constant amplitude, with $\simeq 20\%$ fluctuations over a period of a few days, with no particular time pattern over the course of the mission; 3) at the lowest considered frequency of $f=18\,\mu\text{Hz}$, the ASD significantly deviates from the $1/f$ behavior, because of temperature fluctuations that appear to modulate a quasi-static pressure gradient, sustained by the asymmetries of the outgassing pattern. We also present the results of a projection of the observed acceleration noise on the potential sources for which we had either a direct correlation measurement, or a quantitative estimate from dedicated experiments. These sources account for approximately $40\%$ of the noise power in the $1/f$ tail. Finally, we analyze the possible sources of the remaining unexplained fraction, and identify the possible measures that may be taken to keep those under control in LISA.
Published: 2024
Full Text: View/download PDF

5. NanoNewton electrostatic force actuators for femtoNewton-sensitive measurements: system performance test in the LISA Pathfinder mission

Author: Armano, M, Audley, H, Baird, J, Bassan, M, Binetruy, P, Born, M, Bortoluzzi, D, Castelli, E, Cavalleri, A, Cesarini, A, Chiavegato, V, Cruise, A M, Bosco, D Dal, Danzmann, K, Silva, M De Deus, De Rosa, R, Di Fiore, L, Diepholz, I, Dixon, G, Dolesi, R, Ferroni, L Ferraioli V, Fitzsimons, E D, Freschi, M, Gesa, L, Giardini, D, Gibert, F, Giusteri, R, Grado, A, Grimani, C, Grzymisch, J, Harrison, I, Hartig, M S, Heinzel, G, Hewitson, M, Hollington, D, Hoyland, D, Hueller, M, Inchauspé, H, Jennrich, O, Jetzer, P, Johlander, B, Karnesis, N, Kaune, B, Korsakova, N, Killow, C J, Liu, L, Lobo, J A, López-Zaragoza, J P, Maarschalkerweerd, R, Mance, D, Martín, V, Martin-Polo, L, Martin-Porqueras, F, Martino, J, McNamara, P W, Mendes, J, Mendes, L, Meshksar, N, Moerschell, J, Nofrarias, M, Paczkowski, S, Perreur-Lloyd, M, Petiteau, A, Plagnol, E, Praplan, C, Ramos-Castro, J, Reiche, J, Rivas, F, Robertson, D I, Russano, G, Sala, L, Sarra, P, Schule-Walewski, S L, Slutsky, J, Sopuerta, C F, Stanga, R, Sumner, T, Pierick, J ten, Texier, D, Thorpe, J I, Vetrugno, D, Vitale, S, Wanner, G, Ward, H, Wass, P, Weber, W J, Wissel, L, Wittchen, A, Zanoni, C, and Zweifel, P
Subjects: Astrophysics - Instrumentation and Methods for Astrophysics, General Relativity and Quantum Cosmology
Abstract: Electrostatic force actuation is a key component of the system of geodesic reference test masses (TM) for the LISA orbiting gravitational wave observatory and in particular for performance at low frequencies, below 1 mHz, where the observatory sensitivity is limited by stray force noise. The system needs to apply forces of order 10$^{-9}$ N while limiting fluctuations in the measurement band to levels approaching 10$^{-15}$ N/Hz$^{1/2}$. We present here the LISA actuation system design, based on audio-frequency voltage carrier signals, and results of its in-flight performance test with the LISA Pathfinder test mission. In LISA, TM force actuation is used to align the otherwise free-falling TM to the spacecraft-mounted optical metrology system, without any forcing along the critical gravitational wave-sensitive interferometry axes. In LISA Pathfinder, on the other hand, the actuation was used also to stabilize the TM along the critical $x$ axis joining the two TM, with the commanded actuation force entering directly into the mission's main differential acceleration science observable. The mission allowed demonstration of the full compatibility of the electrostatic actuation system with the LISA observatory requirements, including dedicated measurement campaigns to amplify, isolate, and quantify the two main force noise contributions from the actuation system, from actuator gain noise and from low frequency ``in band'' voltage fluctuations. These campaigns have shown actuation force noise to be a relevant, but not dominant, noise source in LISA Pathfinder and have allowed performance projections for the conditions expected in the LISA mission.
Published: 2023

6. Tilt-to-length coupling in LISA Pathfinder: a data analysis

Author: Armano, M, Audley, H, Baird, J, Binetruy, P, Born, M, Bortoluzzi, D, Castelli, E, Cavalleri, A, Cesarini, A, Cruise, A M, Danzmann, K, Silva, M de Deus, Diepholz, I, Dixon, G, Dolesi, R, Ferraioli, L, Ferroni, V, Fitzsimons, E D, Freschi, M, Gesa, L, Giardini, D, Gibert, F, Giusteri, R, Grimani, C, Grzymisch, J, Harrison, I, Hartig, M-S, Heinzel, G, Hewitson, M, Hollington, D, Hoyland, D, Hueller, M, Inchauspé, H, Jennrich, O, Jetzer, P, Johann, U, Johlander, B, Karnesis, N, Kaune, B, Killow, C J, Korsakova, N, Lobo, J A, López-Zaragoza, J P, Maarschalkerweerd, R, Mance, D, Martín, V, Martin-Polo, L, Martin-Porqueras, F, Martino, J, McNamara, P W, Mendes, J, Mendes, L, Meshksar, N, Nofrarias, M, Paczkowski, S, Perreur-Lloyd, M, Petiteau, A, Plagnol, E, Ramos-Castro, J, Reiche, J, Rivas, F, Robertson, D I, Russano, G, Sanjuan, J, Slutsky, J, Sopuerta, C F, Sumner, T, Tevlin, L, Texier, D, Thorpe, J I, Vetrugno, D, Vitale, S, Wanner, G, Ward, H, Wass, P J, Weber, W J, Wissel, L, Wittchen, A, and Zweifel, P
Subjects: Astrophysics - Instrumentation and Methods for Astrophysics
Abstract: We present a study of the tilt-to-length coupling noise during the LISA Pathfinder mission and how it depended on the system's alignment. Tilt-to-length coupling noise is the unwanted coupling of angular and lateral spacecraft or test mass motion into the primary interferometric displacement readout. It was one of the major noise sources in the LISA Pathfinder mission and is likewise expected to be a primary noise source in LISA. We demonstrate here that a recently derived and published analytical model describes the dependency of the LISA Pathfinder tilt-to-length coupling noise on the alignment of the two freely falling test masses. This was verified with the data taken before and after the realignments performed in March (engineering days) and June 2016, and during a two-day experiment in February 2017 (long cross-talk experiment). The latter was performed with the explicit goal of testing the tilt-to-length coupling noise dependency on the test mass alignment. Using the analytical model, we show that all realignments performed during the mission were only partially successful and explain the reasons why. In addition to the analytical model, we computed another physical tilt-to-length coupling model via a minimising routine making use of the long cross-talk experiment data. A similar approach could prove useful for the LISA mission.
Published: 2023
Full Text: View/download PDF

7. Charging of free-falling test masses in orbit due to cosmic rays: results from LISA Pathfinder

Author: LISA Pathfinder Collaboration, Armano, M., Audley, H., Baird, J., Binetruy, P., Born, M., Bortoluzzi, D., Castelli, E., Cesarini, A. Cavalleri A., Cruise, A. M, Danzmann, K., Silva, M. de Deus, Diepholz, I., Dixon, G., Dolesi, R., Ferraioli, L., Ferroni, V., Fitzsimons, E. D., Freschi, M., Gesa, L., Giardini, D., Gibert, F., Giusteri, R., Grimani, C., Grzymisch, J., Harrison, I., Hartig, M. -S., Heinzel, G., Hewitson, M., Hollington, D., Hoyland, D., Hueller, M., Inchauspé, H., Jennrich, O., Jetzer, P., Karnesis, N., Kaune, B., Killow, C. J., Korsakova, N., Lobo, J. A., López-Zaragoza, J. P., Maarschalkerweerd, R., Mance, D., Martín, V., Martino, J., Martin-Polo, L., Martin-Porqueras, F., McNamara, P. W., Mendes, J., Mendes, L., Meshksar, N., Nofrarias, M., Paczkowski, S., Perreur-Lloyd, M., Petiteau, A., Plagnol, E., Ramos-Castro, J., Reiche, J., Rivas, F., Robertson, D. I., Russano, G., Slutsky, J., Sopuerta, C. F., Sumner, T. J., Texier, D., Thorpe, J. I., Vetrugno, D., Vitale, S., Wanner, G., Ward, H., Wass, P. J., Weber, W. J., Wissel, L., Wittchen, A., and Zweifel, P.
Subjects: Astrophysics - Instrumentation and Methods for Astrophysics
Abstract: A comprehensive summary of the measurements made to characterize test mass charging due to the space environment during the LISA Pathfinder mission is presented. Measurements of the residual charge of the test mass after release by the grabbing and positioning mechanism, show that the initial charge of the test masses was negative after all releases, leaving the test mass with a potential in the range $-12$ mV to $-512$ mV. Variations in the neutral test mass charging rate between $21.7$ e s$^{-1}$ and $30.7$ e s$^{-1}$ were observed over the course of the 17-month science operations produced by cosmic ray flux changes including a Forbush decrease associated with a small solar energetic particle event. A dependence of the cosmic ray charging rate on the test mass potential between $-30.2$ e s$^{-1}$ V$^{-1}$ and $-40.3$ e s$^{-1}$ V$^{-1}$ was observed and this is attributed to a contribution to charging from low-energy electrons emitted from the gold surfaces of the gravitational reference sensor. Data from the on-board particle detector show a reliable correlation with the charging rate and with other environmental monitors of the cosmic ray flux. This correlation is exploited to extrapolate test mass charging rates to a 20-year period giving useful insight into the expected range of charging rate that may be observed in the LISA mission., Comment: 17 pages, 10 figures
Published: 2022
Full Text: View/download PDF

8. Spacecraft and interplanetary contributions to the magnetic environment on-board LISA Pathfinder

Author: Armano, M., Audley, H., Baird, J., Binetruy, P., Born, M., Bortoluzzi, D., Castelli, E., Cavalleri, A., Cesarini, A., Cruise, A. M., Danzmann, K., Silva, M. de Deus, Diepholz, I., Dixon, G., Dolesi, R., Ferraioli, L., Ferroni, V., Fitzsimons, E. D., Freschi, M., Gesa, L., Gibert, F., Giardini, D., Giusteri, R., Grimani, C., Grzymisch, J., Harrison, I., Hartig, M-S., Heinzel, G., Hewitson, M., Hollington, D., Hoyland, D., Hueller, M., Inchauspé, H., Jennrich, O., Jetzer, P., Karnesis, N., Kaune, B., Korsakova, N., Killow, C. J., Lobo, J. A., Liu, L., López-Zaragoza, J. P., Maarschalkerweerd, R., Mance, D., Martín, V., Martin-Polo, L., Martino, J., Martin-Porqueras, F., Mateos, I., McNamara, P. W., Mendes, J., Mendes, L., Meshksar, N., Nofrarias, M., Paczkowski, S., Perreur-Lloyd, M., Petiteau, A., Pivato, P., Plagnol, E., Ramos-Castro, J., Reiche, J., Rivas, F., Robertson, D. I., Roma-Dollase, D., Russano, G., Slutsky, J., Sopuerta, C. F., Sumner, T., Telloni, D., Texier, D., Thorpe, J. I., Trenkel, C., Vetrugno, D., Vitale, S., Wanner, G., Ward, H., Wass, P. J., Wealthy, D., Weber, W. J., Wissel, L., Wittchen, A., and Zweifel, P.
Subjects: Astrophysics - Instrumentation and Methods for Astrophysics
Abstract: LISA Pathfinder (LPF) has been a space-based mission designed to test new technologies that will be required for a gravitational wave observatory in space. Magnetically driven forces play a key role in the instrument sensitivity in the low-frequency regime (mHz and below), the measurement band of interest for a space-based observatory. The magnetic field can couple to the magnetic susceptibility and remanent magnetic moment from the test masses and disturb them from their geodesic movement. LISA Pathfinder carried on-board a dedicated magnetic measurement subsystem with noise levels of 10 $ \rm nT \ Hz^{-1/2}$ from 1 Hz down to 1 mHz. In this paper we report on the magnetic measurements throughout LISA Pathfinder operations. We characterise the magnetic environment within the spacecraft, study the time evolution of the magnetic field and its stability down to 20 $\mu$Hz, where we measure values around 200 $ \rm nT \ Hz^{-1/2}$ and identify two different frequency regimes, one related to the interplanetary magnetic field and the other to the magnetic field originating inside the spacecraft. Finally, we characterise the non-stationary component of the fluctuations of the magnetic field below the mHz and relate them to the dynamics of the solar wind., Comment: 16 pages, 17 figures. MNRAS LaTeX style file version 3.0
Published: 2020
Full Text: View/download PDF

9. A giant exoplanet orbiting a very low-mass star challenges planet formation models

Author: Morales, J. C., Mustill, A. J., Ribas, I., Davies, M. B., Reiners, A., Bauer, F. F., Kossakowski, D., Herrero, E., Rodríguez, E., López-González, M. J., Rodríguez-López, C., Béjar, V. J. S., González-Cuesta, L., Luque, R., Pallé, E., Perger, M., Baroch, D., Johansen, A., Klahr, H., Mordasini, C., Anglada-Escudé, G., Caballero, J. A., Cortés-Contreras, M., Dreizler, S., Lafarga, M., Nagel, E., Passegger, V. M., Reffert, S., Rosich, A., Schweitzer, A., Tal-Or, L., Trifonov, T., Zechmeister, M., Quirrenbach, A., Amado, P. J., Guenther, E. W., Hagen, H. -J., Henning, T., Jeffers, S. V., Kaminski, A., Kürster, M., Montes, D., Seifert, W., Abellán, F. J., Abril, M., Aceituno, J., Aceituno, F. J., Alonso-Floriano, F. J., Eiff, M. Ammler-von, Antona, R., Arroyo-Torres, B., Azzaro, M., Barrado, D., Becerril-Jarque, S., Benítez, D., Berdiñas, Z. M., Bergond, G., Brinkmöller, M., del Burgo, C., Burn, R., Calvo-Ortega, R., Cano, J., Cárdenas, M. C., Guillén, C. Cardona, Carro, J., Casal, E., Casanova, V., Casasayas-Barris, N., Chaturvedi, P., Cifuentes, C., Claret, A., Colomé, J., Czesla, S., Díez-Alonso, E., Dorda, R., Emsenhuber, A., Fernández, M., Fernández-Martín, A., Ferro, I. M., Fuhrmeister, B., Galadí-Enríquez, D., Cava, I. Gallardo, Vargas, M. L. García, Garcia-Piquer, A., Gesa, L., González-Álvarez, E., Hernández, J. I. González, González-Peinado, R., Guàrdia, J., Guijarro, A., de Guindos, E., Hatzes, A. P., Hauschildt, P. H., Hedrosa, R. P., Hermelo, I., Arabi, R. Hernández, Otero, F. Hernández, Hintz, D., Holgado, G., Huber, A., Huke, P., Johnson, E. N., de Juan, E., Kehr, M., Kemmer, J., Kim, M., Klüter, J., Klutsch, A., Labarga, F., Labiche, N., Lalitha, S., Lampón, M., Lara, L. M., Launhardt, R., Lázaro, F. J., Lizon, J. -L., Llamas, M., Lodieu, N., del Fresno, M. López, Salas, J. F. López, López-Santiago, J., Madinabeitia, H. Magán, Mall, U., Mancini, L., Mandel, H., Marfil, E., Molina, J. A. Marín, Martín, E. L., Martín-Fernández, P., Martín-Ruiz, S., Martínez-Rodríguez, H., Marvin, C. J., Mirabet, E., Moya, A., Naranjo, V., Nelson, R. P., Nortmann, L., Nowak, G., Ofir, A., Pascual, J., Pavlov, A., Pedraz, S., Medialdea, D. Pérez, Pérez-Calpena, A., Perryman, M. A. C., Rabaza, O., Ballesta, A. Ramón, Rebolo, R., Redondo, P., Rix, H. -W., Rodler, F., Trinidad, A. Rodríguez, Sabotta, S., Sadegi, S., Salz, M., Sánchez-Blanco, E., Carrasco, M. A. Sánchez, Sánchez-López, A., Sanz-Forcada, J., Sarkis, P., Sarmiento, L. F., Schäfer, S., Schlecker, M., Schmitt, J. H. M. M., Schöfer, P., Solano, E., Sota, A., Stahl, O., Stock, S., Stuber, T., Stürmer, J., Suárez, J. C., Tabernero, H. M., Tulloch, S. M., Veredas, G., Vico-Linares, J. I., Vilardell, F., Wagner, K., Winkler, J., Wolthoff, V., Yan, F., and Osorio, M. R. Zapatero
Subjects: Astrophysics - Earth and Planetary Astrophysics, Astrophysics - Solar and Stellar Astrophysics
Abstract: Statistical analyses from exoplanet surveys around low-mass stars indicate that super-Earth and Neptune-mass planets are more frequent than gas giants around such stars, in agreement with core accretion theory of planet formation. Using precise radial velocities derived from visual and near-infrared spectra, we report the discovery of a giant planet with a minimum mass of 0.46 Jupiter masses in an eccentric 204-day orbit around the very low-mass star GJ 3512. Dynamical models show that the high eccentricity of the orbit is most likely explained from planet-planet interactions. The reported planetary system challenges current formation theories and puts stringent constraints on the accretion and migration rates of planet formation and evolution models, indicating that disc instability may be more efficient in forming planets than previously thought., Comment: Manuscript author version. 41 pages, 11 figures
Published: 2019
Full Text: View/download PDF

10. LISA Pathfinder Performance Confirmed in an Open-Loop Configuration: Results from the Free-Fall Actuation Mode

Author: Armano, M., Audley, H., Baird, J., Binetruy, P., Born, M., Bortoluzzi, D., Castelli, E., Cavalleri, A., Cesarini, A., Cruise, A. M., Danzmann, K., Silva, M. de Deus, Diepholz, I., Dixon, G., Dolesi, R., Ferraioli, L., Ferroni, V., Fitzsimons, E. D., Freschi, M., Gesa, L., Gibert, F., Giardini, D., Giusteri, R., Grimani, C., Grzymisch, J., Harrison, I., Hartig, M-S., Heinzel, G., Hewitson, M., Hollington, D., Hoyland, D., Hueller, M., Inchauspé, H., Jennrich, O., Jetzer, P., Karnesis, N., Kaune, B., Korsakova, N., Killow, C. J., Lobo, J. A., Liu, L., Llopez-Zaragoza, J. P., Maarschalkerweerd, R., Mance, D., Meshksar, N., Martìn, V., Martin-Polo, L., Martino, J., Martin-Porqueras, F., Mateos, I., McNamara, P. W., Mendes, J., Mendes, L., Nofrarias, M., Paczkowski, S., Perreur-Lloyd, M., Petiteau, A., Pivato, P., Plagnol, E., Ramos-Castro, J., Reiche, J., Robertson, D. I., Rivas, F., Russano, G., Slutsky, J., Sopuerta, C. F., Sumner, T., Texier, D., Thorpe, J. I., Vetrugno, D., Vitale, S., Wanner, G., Ward, H., Wass, P. J., Weber, W. J., Wissel, L., Wittchen, A., and Zweifel, P.
Subjects: Physics - Space Physics, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract: We report on the results of the LISA Pathfinder (LPF) free-fall mode experiment, in which the control force needed to compensate the quasistatic differential force acting on two test masses is applied intermittently as a series of "impulse" forces lasting a few seconds and separated by roughly 350 s periods of true free fall. This represents an alternative to the normal LPF mode of operation in which this balancing force is applied continuously, with the advantage that the acceleration noise during free fall is measured in the absence of the actuation force, thus eliminating associated noise and force calibration errors. The differential acceleration noise measurement presented here with the free-fall mode agrees with noise measured with the continuous actuation scheme, representing an important and independent confirmation of the LPF result. An additional measurement with larger actuation forces also shows that the technique can be used to eliminate actuation noise when this is a dominant factor.
Published: 2019
Full Text: View/download PDF

11. The CARMENES search for exoplanets around M dwarfs. Two temperate Earth-mass planet candidates around Teegarden's Star

Author: Zechmeister, M., Dreizler, S., Ribas, I., Reiners, A., Caballero, J. A., Bauer, F. F., Béjar, V. J. S., González-Cuesta, L., Herrero, E., Lalitha, S., López-González, M. J., Luque, R., Morales, J. C., Pallé, E., Rodríguez, E., López, C. Rodríguez, Tal-Or, L., Anglada-Escudé, G., Quirrenbach, A., Amado, P. J., Abril, M., Aceituno, F. J., Aceituno, J., Alonso-Floriano, F. J., Eiff, M. Ammler-von, Jiménez, R. Antona, Anwand-Heerwart, H., Arroyo-Torres, B., Azzaro, M., Baroch, D., Barrado, D., Becerril, S., Benítez, D., Berdiñas, Z. M., Bergond, G., Bluhm, P., Brinkmöller, M., del Burgo, C., Ortega, R. Calvo, Cano, J., Guillén, C. Cardona, Carro, J., Vázquez, M. C. Cárdenas, Casal, E., Casasayas-Barris, N., Casanova, V., Chaturvedi, P., Cifuentes, C., Claret, A., Colomé, J., Cortés-Contreras, M., Czesla, S., Díez-Alonso, E., Dorda, R., Fernández, M., Fernández-Martín, A., Ferro, I. M., Fuhrmeister, B., Fukui, A., Galadí-Enríquez, D., Cava, I. Gallardo, de la Fuente, J. Garcia, Garcia-Piquer, A., Vargas, M. L. García, Gesa, L., Rueda, J. Góngora, González-Álvarez, E., Hernández, J. I. González, González-Peinado, R., Grözinger, U., Guàrdia, J., Guijarro, A., de Guindos, E., Hatzes, A. P., Hauschildt, P. H., Hedrosa, R. P., Helmling, J., Henning, T., Hermelo, I., Arabi, R. Hernández, Castaño, L. Hernández, Otero, F. Hernández, Hintz, D., Huke, P., Huber, A., Jeffers, S. V., Johnson, E. N., de Juan, E., Kaminski, A., Kemmer, J., Kim, M., Klahr, H., Klein, R., Klüter, J., Klutsch, A., Kossakowski, D., Kürster, M., Labarga, F., Lafarga, M., Llamas, M., Lampón, M., Lara, L. M., Launhardt, R., Lázaro, F. J., Lodieu, N., del Fresno, M. López, López-Comazzi, A., López-Puertas, M., Salas, J. F. López, López-Santiago, J., Madinabeitia, H. Magán, Mall, U., Mancini, L., Mandel, H., Marfil, E., Molina, J. A. Marín, Fernández, D. Maroto, Martín, E. L., Martín-Fernández, P., Martín-Ruiz, S., Marvin, C. J., Mirabet, E., Montañés-Rodríguez, P., Montes, D., Moreno-Raya, M. E., Nagel, E., Naranjo, V., Narita, N., Nortmann, L., Nowak, G., Ofir, A., Oshagh, M., Panduro, J., Parviainen, H., Pascual, J., Passegger, V. M., Pavlov, A., Pedraz, S., Pérez-Calpena, A., Medialdea, D. Pérez, Perger, M., Perryman, M. A. C., Rabaza, O., Ballesta, A. Ramón, Rebolo, R., Redondo, P., Reffert, S., Reinhardt, S., Rhode, P., Rix, H. -W., Rodler, F., Trinidad, A. Rodríguez, Rosich, A., Sadegi, S., Sánchez-Blanco, E., Carrasco, M. A. Sánchez, Sánchez-López, A., Sanz-Forcada, J., Sarkis, P., Sarmiento, L. F., Schäfer, S., Schmitt, J. H. M. M., Schöfer, P., Schweitzer, A., Seifert, W., Shulyak, D., Solano, E., Sota, A., Stahl, O., Stock, S., Strachan, J. B. P., Stuber, T., Stürmer, J., Suárez, J. C., Tabernero, H. M., Pinto, M. Tala, Trifonov, T., Veredas, G., Linares, J. I. Vico, Vilardell, F., Wagner, K., Wolthoff, V., Xu, W., Yan, F., and Osorio, M. R. Zapatero
Subjects: Astrophysics - Earth and Planetary Astrophysics
Abstract: Context. Teegarden's Star is the brightest and one of the nearest ultra-cool dwarfs in the solar neighbourhood. For its late spectral type (M7.0V), the star shows relatively little activity and is a prime target for near-infrared radial velocity surveys such as CARMENES. Aims. As part of the CARMENES search for exoplanets around M dwarfs, we obtained more than 200 radial-velocity measurements of Teegarden's Star and analysed them for planetary signals. Methods. We find periodic variability in the radial velocities of Teegarden's Star. We also studied photometric measurements to rule out stellar brightness variations mimicking planetary signals. Results. We find evidence for two planet candidates, each with $1.1M_\oplus$ minimum mass, orbiting at periods of 4.91 and 11.4 d, respectively. No evidence for planetary transits could be found in archival and follow-up photometry. Small photometric variability is suggestive of slow rotation and old age. Conclusions. The two planets are among the lowest-mass planets discovered so far, and they are the first Earth-mass planets around an ultra-cool dwarf for which the masses have been determined using radial velocities., Comment: A&A 627, A49. 26 pages, 17 figures, 6 tables. Press release available at http://www.astro.physik.uni-goettingen.de/~zechmeister/teegarden/teegarden.html. v2: two authors and one reference added
Published: 2019
Full Text: View/download PDF

12. Temperature stability in the sub-milliHertz band with LISA Pathfinder

Author: Armano, M., Audley, H., Baird, J., Binetruy, P., Born, M., Bortoluzzi, D., Castelli, E., Cavalleri, A., Cesarini, A., Cruise, A. M., Danzmann, K., Silva, M. de Deus, Diepholz, I., Dixon, G., Dolesi, R., Ferraioli, L., Ferroni, V., Fitzsimons, E. D., Freschi, M., Gesa, L., Gibert, F., Giardini, D., Giusteri, R., Grimani, C., Grzymisch, J., Harrison, I., Heinzel, G., Hewitson, M., Hollington, D., Hoyland, D., Hueller, M., Inchauspé, H., Jennrich, O., Jetzer, P., Karnesis, N., Kaune, B., Korsakova, N., Killow, C. J., Lobo, J. A., Lloro, I., Liu, L., López-Zaragoza, J. P., Maarschalkerweerd, R., Mance, D., Mansanet, C., Martín, V., Martin-Polo, L., Martino, J., Martin-Porqueras, F., Mateos, I., McNamara, P. W., Mendes, J., Mendes, L., Meshksar, N., Nofrarias, M., Paczkowski, S., Perreur-Lloyd, M., Petiteau, A., Pivato, P., Plagnol, E., Ramos-Castro, J., Reiche, J., Robertson, D. I., Rivas, F., Russano, G., Sanjuán, J., Slutsky, J., Sopuerta, C. F., Sumner, T., Texier, D., Thorpe, J. I., Trenkel, C., Vetrugno, D., Vitale, S., Wanner, G., Ward, H., Wass, P. J., Wealthy, D., Weber, W. J., Wissel, L., Wittchen, A., and Zweifel, P.
Subjects: Astrophysics - Instrumentation and Methods for Astrophysics, General Relativity and Quantum Cosmology
Abstract: LISA Pathfinder (LPF) was a technology pioneering mission designed to test key technologies required for gravitational wave detection in space. In the low frequency regime (milli-Hertz and below), where space-based gravitational wave observatories will operate, temperature fluctuations play a crucial role since they can couple into the interferometric measurement and the test masses' free-fall accuracy in many ways. A dedicated temperature measurement subsystem, with noise levels in 10$\,\mu$K$\,$Hz$^{-1/2}$ down to $1\,$mHz was part of the diagnostics unit on board LPF. In this paper we report on the temperature measurements throughout mission operations, characterize the thermal environment, estimate transfer functions between different locations and report temperature stability (and its time evolution) at frequencies as low as 10$\,\mu$Hz, where typically values around $1\,$K$\,$Hz$^{-1/2}$ were measured., Comment: 13 pages, 16 figures. MNRAS LaTeX style file version 3.0
Published: 2019
Full Text: View/download PDF

13. Micrometeoroid Events in LISA Pathfinder

Author: Thorpe, James Ira, Slutsky, Jacob, Baker, John, Littenberg, Tyson, Hourihane, Sophie, Pagane, Nicole, Pokorny, Petr, Janches, Diego, Armano, Michele, Audley, Heather, Auger, G., Baird, Jonathan, Bassan, Massimo, Binetruy, Pierre, Born, Michael, Bortoluzzi, D., Brandt, N., Caleno, M., Cavalleri, A, Cesarini, A, Cruise, A. M., Danzmann, K., Silva, M. de Deus, De Rosa, R., Di Fiore, L., Diepholz, I., Dixon, G., Dolesi, R., Dunbar, N., Ferraioli, L., Ferroni, V., Fitzsimons, E., Flatscher, R., Freschi, M., Marirrodriga, C. Garcia, Gerndt, R., Gesa, L., Gibert, F., Giardini, D., Giusteri, R., Grado, A., Grimani, C., Gryzmisch, J., Harrison, I., Heinzel, G., Hewitson, M., Hollington, D., Hoyland, D., Hueller, M., Inchauspe, H., Jennrich, O., Jetzer, P., Johlander, B., Karnesis, N., Kaune, B., Korsakova, N., Killow, C., Lobo, J. A., Lloro, I., Liu, L., Lopez-Zaragoza, J. P., Maarschalkerweerd, R., Mance, D., Martin, V., Martin-Polo, L., Martino, J., Martin-Porqueras, F., Madden, S., Mateos, I., McNamara, P. W., Mendes, J., Mendes, L., Nofarias, M., Paczkowski, S., Perreur-Lloyd, M., Petiteau, A., Pivato, P., Plagnol, E., Prat, P., Ragnit, U., Ramos-Castro, J., Reiche, J., Robertson, D., Rozemeijer, H., Rivas, F., Russano, G., Sarra, P., Schleicher, A., Shaul, D., Soperta, C., Stanga, R., Sumner, T., Texier, D., Trobs, M., Vetrungno, D., Vitale, S., Wanner, G., Ward, H., Wass, P., Wealthy, D., Weber, W. J., Wissel, L., Wittchen, A., Zambotti, A., Zanoni, C., Ziegler, T., and Zweifel, P.
Subjects: Astrophysics - Earth and Planetary Astrophysics
Abstract: The zodiacal dust complex, a population of dust and small particles that pervades the Solar System, provides important insight into the formation and dynamics of planets, comets, asteroids, and other bodies. Here we present a new set of data obtained using a novel technique: direct measurements of momentum transfer to a spacecraft from individual particle impacts. This technique is made possible by the extreme precision of the instruments flown on the LISA Pathfinder spacecraft, a technology demonstrator for a future space-based gravitational wave observatory that operated near the first Sun-Earth Lagrange point from early 2016 through Summer of 2017. Using a simple model of the impacts and knowledge of the control system, we show that it is possible to detect impacts and measure properties such as the transferred momentum (related to the particle's mass and velocity), direction of travel, and location of impact on the spacecraft. In this paper, we present the results of a systematic search for impacts during 4348 hours of Pathfinder data. We report a total of 54 candidates with momenta ranging from 0.2$\,\mu\textrm{Ns}$ to 230$\,\mu\textrm{Ns}$. We furthermore make a comparison of these candidates with models of micrometeoroid populations in the inner solar system including those resulting from Jupiter-family comets, Oort-cloud comets, Hailey-type comets, and Asteroids. We find that our measured population is consistent with a population dominated by Jupiter-family comets with some evidence for a smaller contribution from Hailey-type comets. This is in agreement with consensus models of the zodiacal dust complex in the momentum range sampled by LISA Pathfinder., Comment: 22 pages, 14 figures, accepted in ApJ
Published: 2019
Full Text: View/download PDF

14. Forbush decreases and $<$ 2-day GCR flux non-recurrent variations studied with LISA Pathfinder

Author: Grimani, C., Armano, M., Audley, H., Baird, J., Benella, S., Binetruy, P., Born, M., Bortoluzzi, D., Castelli, E., Cavalleri, A., Cesarini, A., Cruise, A. M., Danzmann, K., Silva, M. de Deus, Diepholz, I., Dixon, G., Dolesi, R., Fabi, M., Ferraioli, L., Ferroni, V., Finetti, N., Fitzsimons, E. D., Freschi, M., Gesa, L., Gibert, F., Giardini, D., Giusteri, R., Grzymisch, J., Harrison, I., Heinzel, G., Hewitson, M., Hollington, D., Hoyland, D., Hueller, M., Inchauspé, H., Jennrich, O., Jetzer, P., Karnesis, N., Kaune, B., Korsakova, N., Killow, C. J., Kudela, K., Laurenza, M., Lobo, J. A., Lloro, I., Liu, L., López-Zaragoza, J. P., Maarschalkerweerd, R., Mance, D., Meshksar, N., Martín, V., Martin-Polo, L., Martino, J., Martin-Porqueras, F., Mateos, I., McNamara, P. W., Mendes, J., Mendes, L., Nofrarias, M., Paczkowski, S., Perreur-Lloyd, M., Petiteau, A., Pivato, P., Plagnol, E., Ramos-Castro, J., Reiche, J., Robertson, D. I., Rivas, F., Russano, G., Slutsky, J., Sopuerta, C. F., Sumner, T., Telloni, D., Texier, D., Thorpe, J. I., Vetrugno, D., Villani, M., Vitale, S., Wanner, G., Ward, H., Wass, P., Weber, W. J., Wissel, L., Wittchen, A., and Zweifel, P.
Subjects: Physics - Space Physics, Astrophysics - Earth and Planetary Astrophysics, Astrophysics - Solar and Stellar Astrophysics
Abstract: Non-recurrent short term variations of the galactic cosmic-ray (GCR) flux above 70 MeV n$^{-1}$ were observed between 2016 February 18 and 2017 July 3 aboard the European Space Agency LISA Pathfinder (LPF) mission orbiting around the Lagrange point L1 at 1.5$\times$10$^6$ km from Earth. The energy dependence of three Forbush decreases (FDs) is studied and reported here. A comparison of these observations with others carried out in space down to the energy of a few tens of MeV n$^{-1}$ shows that the same GCR flux parameterization applies to events of different intensity during the main phase. FD observations in L1 with LPF and geomagnetic storm occurrence is also presented. Finally, the characteristics of GCR flux non-recurrent variations (peaks and depressions) of duration $<$ 2 days and their association with interplanetary structures are investigated. It is found that, most likely, plasma compression regions between subsequent corotating high-speed streams cause peaks, while heliospheric current sheet crossing cause the majority of the depressions.
Published: 2019
Full Text: View/download PDF

15. Experimental results from the ST7 mission on LISA Pathfinder

Author: Anderson, G, Anderson, J, Anderson, M, Aveni, G, Bame, D, Barela, P, Blackman, K, Carmain, A, Chen, L, Cherng, M, Clark, S, Connally, M, Connolly, W, Conroy, D, Cooper, M, Cutler, C, D'Agostino, J, Demmons, N, Dorantes, E, Dunn, C, Duran, M, Ehrbar, E, Evans, J, Fernandez, J, Franklin, G, Girard, M, Gorelik, J, Hruby, V, Hsu, O, Jackson, D, Javidnia, S, Kern, D, Knopp, M, Kolasinski, R, Kuo, C, Le, T, Li, I, Liepack, O, Littlefield, A, Maghami, P, Malik, S, Markley, L, Martin, R, Marrese-Reading, C, Mehta, J, Mennela, J, Miller, D, Nguyen, D, O'Donnell, J, Parikh, R, Plett, G, Ramsey, T, Randolph, T, Rhodes, S, Romero-Wolf, A, Roy, T, Ruiz, A, Shaw, H, Slutsky, J, Spence, D, Stocky, J, Tallon, J, Thorpe, I, Tolman, W, Umfress, H, Valencia, R, Valerio, C, Warner, W, Wellman, J, Willis, P, Ziemer, J, Zwahlen, J, Armano, M, Audley, H, Baird, J, Binetruy, P, Born, a M, Bortoluzzi, D, Castelli, E, Cavalleri, A, Cesarini, A, Cruise, A M, Danzmann, K, Silva, M de Deus, Diepholz, I, Dixon, G, Dolesi, R, Ferraioli, L, Ferroni, V, Fitzsimons, E D, Freschi, M, Gesa, L, Gibert, F, Giardini, D, Giusteri, R, Grimani, C, Grzymisch, J, Harrison, I, Heinzel, G, Hewitson, M, Hollington, D, Hoyland, D, Hueller, M, Inchauspe, H, Jennrich, O, Jetzer, P, Karnesis, N, Kaune, B, Korsakova, N, Killow, C J, Lobo, J A, Lloro, I, Liu, L, Lopez-Zaragoza, J P, Maarschalkerweerd, R, Mance, D, Meshksar, N, Martin, V, Martin-Polo, L, Martino, J, Martin-Porqueras, F, Mateos, I, McNamara, P W, Mendes, J, Mendes, L, Nofrarias, M, Paczkowski, S, Perreur-Lloyd, M, Petiteau, A, Pivato, P, Plagnol, E, Ramos-Castro, J, Reiche, J, Robertson, D I, Rivas, F, Russano, G, Sopuerta, C F, Sumner, T, Texier, D, Vetrugno, D, Vitale, S, Wanner, G, Ward, H, Wass, P J, Weber, W J, Wissel, L, Wittchen, A, and Zweifel, P
Subjects: Astrophysics - Instrumentation and Methods for Astrophysics
Abstract: The Space Technology 7 Disturbance Reduction System (ST7-DRS) is a NASA technology demonstration payload that operated from January 2016 through July of 2017 on the European Space Agency's LISA Pathfinder spacecraft. The joint goal of the NASA and ESA missions was to validate key technologies for a future space-based gravitational wave observatory targeting the source-rich milliHertz band. The two primary components of ST7-DRS are a micropropulsion system based on colloidal micro-Newton thrusters (CMNTs) and a control system that simultaneously controls the attitude and position of the spacecraft and the two free-flying test masses (TMs). This paper presents our main experimental results and summarizes the overall the performance of the CMNTs and control laws. We find that the CMNT performance to be consistent with pre-flight predictions, with a measured system thrust noise on the order of $100\,\textrm{nN}/\sqrt{\textrm{Hz}}$ in the $1\,\textrm{mHz}\leq f \leq 30\,\textrm{mHz}$ band. The control system maintained the TM-spacecraft separation with an RMS error of less than 2$\,$nm and a noise spectral density of less than $3\,\textrm{nm}/\sqrt{\textrm{Hz}}$ in the same band. Thruster calibration measurements yield thrust values consistent with the performance model and ground-based thrust-stand measurements, to within a few percent. We also report a differential acceleration noise between the two test masses with a spectral density of roughly $3\,\textrm{fm}/\textrm{s}^2/\sqrt{\textrm{Hz}}$ in the $1\,\textrm{mHz}\leq f \leq 30\,\textrm{mHz}$ band, slightly less than twice as large as the best performance reported with the baseline LISA Pathfinder configuration and below the current requirements for the Laser Interferometer Space Antenna (LISA) mission.
Published: 2018
Full Text: View/download PDF

16. Precision Charge Control for Isolated Free-Falling Test Masses: LISA Pathfinder Results

Author: Armano, M., Audley, H., Baird, J., Binetruy, P., Born, M., Bortoluzzi, D., Castelli, E., Cavalleri, A., Cesarini, A., Cruise, A. M., Danzmann, K., Silva, M. de Deus, Diepholz, I., Dixon, G., Dolesi, R., Ferraioli, L., Ferroni, V., Fitzsimons, E. D., Freschi, M., Gesa, L., Giardini, D., Gibert, F., Giusteri, R., Grimani, C., Grzymisch, J., Harrison, I., Heinzel, G., Hewitson, M., Hollington, D., Hoyland, D., Hueller, M., Inchauspé, H., Jennrich, O., Jetzer, P., Karnesis, N., Kaune, B., Korsakova, N., Killow, C. J., Liu, L., Lloro, I., Lobo, J. A., López-Zaragoza, J. P., Maarschalkerweerd, R., Mailland, F., Mance, D., Martín, V., Martin-Polo, L., Martin-Porqueras, F., Martino, J., Mateos, I., McNamara, P. W., Mendes, J., Mendes, L., Meshskar, N., Nofrarias, M., Paczkowski, S., Perreur-Lloyd, M., Petiteau, A., Pfeil, M., Pivato, P., Plagnol, E., Ramos-Castro, J., Reiche, J., Robertson, D. I., Rivas, F., Russano, G., Santoruvo, G., Sarra, P., Shaul, D., Slutsky, J., Sopuerta, C. F., Sumner, T., Texier, D., Thorpe, J. I., Trenkel, C., Vetrugno, D., Vitale, S., Wanner, G., Ward, H., Waschke, S., Wass, P. J., Weber, W. J., Wissel, L., Wittchen, A., and Zweifel, P.
Subjects: Physics - Instrumentation and Detectors
Abstract: The LISA Pathfinder charge management device was responsible for neutralising the cosmic ray induced electric charge that inevitably accumulated on the free-falling test masses at the heart of the experiment. We present measurements made on ground and in-flight that quantify the performance of this contactless discharge system which was based on photo-emission under UV illumination. In addition, a two-part simulation is described that was developed alongside the hardware. Modelling of the absorbed UV light within the Pathfinder sensor was carried out with the GEANT4 software toolkit and a separate MATLAB charge transfer model calculated the net photocurrent between the test masses and surrounding housing in the presence of AC and DC electric fields. We confront the results of these models with observations and draw conclusions for the design of discharge systems for future experiments like LISA that will also employ free-falling test masses.
Published: 2018
Full Text: View/download PDF

17. Calibrating the system dynamics of LISA Pathfinder

Author: Armano, M., Audley, H., Baird, J., Binetruy, P., Born, M., Bortoluzzi, D., Castelli, E., Cavalleri, A., Cesarini, A., Cruise, A. M., Danzmann, K., Silva, M. de Deus, Diepholz, I., Dixon, G., Dolesi, R., Ferraioli, L., Ferroni, V., Fitzsimons, E. D., Freschi, M., Gesa, L., Gibert, F., Giardini, D., Giusteri, R., Grimani, C., Grzymisch, J., Harrison, I., Heinzel, G., Hewitson, M., Hollington, D., Hoyland, D., Hueller, M., Inchauspé, H., Jennrich, O., Jetzer, P., Karnesis, N., Kaune, B., Korsakova, N., Killow, C. J., Lobo, J. A., Lloro, I., Liu, L., López-Zaragoza, J. P., Maarschalkerweerd, R., Mance, D., Meshksar, N., Martín, V., Martin-Polo, L., Martino, J., Martin-Porqueras, F., Mateos, I., McNamara, P. W., Mendes, J., Mendes, L., Nofrarias, M., Paczkowski, S., Perreur-Lloyd, M., Petiteau, A., Pivato, P., Plagnol, E., Ramos-Castro, J., Reiche, J., Robertson, D. I., Rivas, F., Russano, G., Slutsky, J., Sopuerta, C. F., Sumner, T., Texier, D., Thorpe, J. I., Vetrugno, D., Vitale, S., Wanner, G., Ward, H., Wass, P., Weber, W. J., Wissel, L., Wittchen, A., and Zweifel, P.
Subjects: Astrophysics - Instrumentation and Methods for Astrophysics
Abstract: LISA Pathfinder (LPF) was a European Space Agency mission with the aim to test key technologies for future space-borne gravitational-wave observatories like LISA. The main scientific goal of LPF was to demonstrate measurements of differential acceleration between free-falling test masses at the sub-femto-g level, and to understand the residual acceleration in terms of a physical model of stray forces, and displacement readout noise. A key step toward reaching the LPF goals was the correct calibration of the dynamics of LPF, which was a three-body system composed by two test-masses enclosed in a single spacecraft, and subject to control laws for system stability. In this work, we report on the calibration procedures adopted to calculate the residual differential stray force per unit mass acting on the two test-masses in their nominal positions. The physical parameters of the adopted dynamical model are presented, together with their role on LPF performance. The analysis and results of these experiments show that the dynamics of the system was accurately modeled and the dynamical parameters were stationary throughout the mission. Finally, the impact and importance of calibrating system dynamics for future space-based gravitational wave observatories is discussed.
Published: 2018
Full Text: View/download PDF

18. Characteristics and energy dependence of recurrent galactic cosmic-ray flux depressions and of a Forbush decrease with LISA Pathfinder

Author: Armano, M., Audley, H., Baird, J., Bassan, M., Benella, S., Binetruy, P., Born, M., Bortoluzzi, D., Cavalleri, A., Cesarini, A., Cruise, A. M., Danzmann, K., Silva, M. de Deus, Diepholz, I., Dixon, G., Dolesi, R., Fabi, M., Ferraioli, L., Ferroni, V., Finetti, N., Fitzsimons, E. D., Freschi, M., Gesa, L., Gibert, F., Giardini, D., Giusteri, R., Grimani, C., Grzymisch, J., Harrison, I., Heinzel, G., Hewitson, M., Hollington, D., Hoyland, D., Hueller, M., Inchauspé, H., Jennrich, O., Jetzer, P., Karnesis, N., Kaune, B., Korsakova, N., Killow, C. J., Laurenza, M., Lobo, J. A., Lloro, I., Liu, L., López-Zaragoza, J. P., Maarschalkerweerd, R., Mance, D., Martín, V., Martin-Polo, L., Martino, J., Martin-Porqueras, F., Mateos, I., McNamara, P. W., Mendes, J., Mendes, L., Nofrarias, M., Paczkowski, S., Perreur-Lloyd, M., Petiteau, A., Pivato, P., Plagnol, E., Ramos-Castro, J., Reiche, J., Robertson, D. I., Rivas, F., Russano, G., Sabbatini, F., Slutsky, J., Sopuerta, C. F., Sumner, T., Telloni, D., Texier, D., Thorpe, J. I., Vetrugno, D., Vitale, S., Wanner, G., Ward, H., Wass, P., Weber, W. J., Wissel, L., Wittchen, A., Zambotti, A., Zanoni, C., and Zweifel, P.
Subjects: Physics - Space Physics, Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Solar and Stellar Astrophysics
Abstract: Galactic cosmic-ray (GCR) energy spectra observed in the inner heliosphere are modulated by the solar activity, the solar polarity and structures of solar and interplanetary origin. A high counting rate particle detector (PD) aboard LISA Pathfinder (LPF), meant for subsystems diagnostics, was devoted to the measurement of galactic cosmic-ray and solar energetic particle integral fluxes above 70 MeV n$^{-1}$ up to 6500 counts s$^{-1}$. PD data were gathered with a sampling time of 15 s. Characteristics and energy-dependence of GCR flux recurrent depressions and of a Forbush decrease dated August 2, 2016 are reported here. The capability of interplanetary missions, carrying PDs for instrument performance purposes, in monitoring the passage of interplanetary coronal mass ejections (ICMEs) is also discussed.
Published: 2018
Full Text: View/download PDF

19. The CARMENES search for exoplanets around M dwarfs - HD 147379b: A nearby Neptune in the temperate zone of an early-M dwarf

Author: Reiners, A., Ribas, I., Zechmeister, M., Caballero, J. A., Trifonov, T., Dreizler, S., Morales, J. C., Tal-Or, L., Lafarga, M., Quirrenbach, A., Amado, P. J., Kaminski, A., Jeffers, S. V., Aceituno, J., Béjar, V. J. S., Guàrdia, J., Guenther, E. W., Hagen, H. -J., Montes, D., Passegger, V. M., Seifert, W., Schweitzer, A., Cortés-Contreras, M., Abril, M., Alonso-Floriano, F. J., Eiff, M. Ammler-von, Antona, R., Anglada-Escudé, G., Anwand-Heerwart, H., Arroyo-Torres, B., Azzaro, M., Baroch, D., Barrado, D., Bauer, F. F., Becerril, S., Benítez, D., Berdiñas, Z. M., Bergond, G., Blümcke, M., Brinkmöller, M., del Burgo, C., Cano, J., Vázquez, M. C. Cárdenas, Casal, E., Cifuentes, C., Claret, A., Colomé, J., Czesla, S., Díez-Alonso, E., Feiz, C., Fernández, M., Ferro, I. M., Fuhrmeister, B., Galadí-Enríquez, D., Garcia-Piquer, A., Vargas, M. L. García, Gesa, L., Galera, V. Gómez, Hernández, J. I. González, González-Peinado, R., Grözinger, U., Grohnert, S., Guijarro, A., de Guindos, E., Gutiérrez-Soto, J., Hatzes, A. P., Hauschildt, P. H., Hedrosa, R. P., Helmling, J., Henning, Th., Hermelo, I., Arabí, R. Hernández, Castaño, L. Hernández, Hernando, F. Hernández, Herrero, E., Huber, A., Huke, P., Johnson, E. N., de Juan, E., Kim, M., Klein, R., Klüter, J., Klutsch, A., Kürster, M., Labarga, F., Lamert, A., Lampón, M., Lara, L. M., Laun, W., Lemke, U., Lenzen, R., Launhardt, R., del Fresno, M. López, López-González, M. J., López-Puertas, M., Salas, J. F. López, López-Santiago, J., Luque, R., Madinabeitia, H. Magán, Mall, U., Mancini, L., Mandel, H., Marfil, E., Molina, J. A. Marín, Fernández, D. Maroto, Martín, E. L., Martín-Ruiz, S., Marvin, C. J., Mathar, R. J., Mirabet, E., Moreno-Raya, M. E., Moya, A., Mundt, R., Nagel, E., Naranjo, V., Nortmann, L., Nowak, G., Ofir, A., Oreiro, R., Pallé, E., Panduro, J., Pascual, J., Pavlov, A., Pedraz, S., Pérez-Calpena, A., Medialdea, D. Pérez, Perger, M., Perryman, M. A. C., Pluto, M., Rabaza, O., Ramón, A., Rebolo, R., Redondo, P., Reffert, S., Reinhart, S., Rhode, P., Rix, H. -W., Rodler, F., Rodríguez, E., Rodríguez-López, C., Trinidad, A. Rodríguez, Rohloff, R. -R., Rosich, A., Sadegi, S., Sánchez-Blanco, E., Carrasco, M. A. Sánchez, Sánchez-López, A., Sanz-Forcada, J., Sarkis, P., Sarmiento, L. F., Schäfer, S., Schmitt, J. H. M. M., Schiller, J., Schöfer, P., Solano, E., Stahl, O., Strachan, J. B. P., Stürmer, J., Suárez, J. C., Tabernero, H. M., Tala, M., Tulloch, S. M., Ulbrich, R. -G., Veredas, G., Linares, J. I. Vico, Vilardell, F., Wagner, K., Winkler, J., Wolthoff, V., Xu, W., Yan, F., and Osorio, M. R. Zapatero
Subjects: Astrophysics - Earth and Planetary Astrophysics, Astrophysics - Solar and Stellar Astrophysics
Abstract: We report on the first star discovered to host a planet detected by radial velocity (RV) observations obtained within the CARMENES survey for exoplanets around M dwarfs. HD 147379 ($V = 8.9$ mag, $M = 0.58 \pm 0.08$ M$_{\odot}$), a bright M0.0V star at a distance of 10.7 pc, is found to undergo periodic RV variations with a semi-amplitude of $K = 5.1\pm0.4$ m s$^{-1}$ and a period of $P = 86.54\pm0.06$ d. The RV signal is found in our CARMENES data, which were taken between 2016 and 2017, and is supported by HIRES/Keck observations that were obtained since 2000. The RV variations are interpreted as resulting from a planet of minimum mass $m_{\rm p}\sin{i} = 25 \pm 2$ M$_{\oplus}$, 1.5 times the mass of Neptune, with an orbital semi-major axis $a = 0.32$ au and low eccentricity ($e < 0.13$). HD 147379b is orbiting inside the temperate zone around the star, where water could exist in liquid form. The RV time-series and various spectroscopic indicators show additional hints of variations at an approximate period of 21.1d (and its first harmonic), which we attribute to the rotation period of the star., Comment: accepted for publication as A&A Letter
Published: 2017
Full Text: View/download PDF

20. Measuring the Galactic Cosmic Ray Flux with the LISA Pathfinder Radiation Monitor

Author: Armano, M, Audley, H, Baird, J, Binetruy, P, Born, M, Bortoluzzi, D, Castelli, E, Cavalleri, A, Cesarini, A, Cruise, M, Danzmann, K, Silva, M de Deus, Diepholz, I, Dixon, G, Dolesi, R, Ferraioli, L, Ferroni, V, Finetti, N, Fitzsimons, E D, Freschi, M, Gesa, L, Gibert, F, Giardini, D, Giusteri, R, Grimani, C, Grzymisch, J, Harrison, I, Heinzel, G, Hewitson, M, Hollington, D, Hoyland, D, Hueller, M, Inchauspe, H, Jennrich, O, Jetzer, P, Karnesis, N, Kaune, B, Korsakova, N, Killow, C J, Lobo, J A, Lloro, I, Liu, L, Lopez-Zaragoza, J P, Maarschalkerweerd, R, Mance, D, Meshskar, N, Martin, V, Martin-Polo, L, Martino, J, Martin-Porqueras, F, Mateos, I, McNamara, P W, Mendes, J, Mendes, L, Nofrarias, M, Paczkowski, S, Perreur-Lloyd, M, Petiteau, A, Pivato, P, Plagnol, E, Ramos-Castro, J, Reiche, J, Robertson, D I, Rivas, F, Russano, G, Slutsky, J, Sopuerta, C F, Sumner, T, Texier, D, Thorpe, J I, Vetrugno, D, Vitale, S, Wanner, G, Ward, H, Wass, P, Weber, W J, Wissel, L, Wittchen, A, and Zweifel, P
Subjects: Astrophysics - Instrumentation and Methods for Astrophysics
Abstract: Test mass charging caused by cosmic rays will be a significant source of acceleration noise for space-based gravitational wave detectors like LISA. Operating between December 2015 and July 2017, the technology demonstration mission LISA Pathfinder included a bespoke monitor to help characterise the relationship between test mass charging and the local radiation environment. The radiation monitor made in situ measurements of the cosmic ray flux while also providing information about its energy spectrum. We describe the monitor and present measurements which show a gradual 40% increase in count rate coinciding with the declining phase of the solar cycle. Modulations of up to 10% were also observed with periods of 13 and 26 days that are associated with co-rotating interaction regions and heliospheric current sheet crossings. These variations in the flux above the monitor detection threshold (approximately 70 MeV) are shown to be coherent with measurements made by the IREM monitor on-board the Earth orbiting INTEGRAL spacecraft. Finally we use the measured deposited energy spectra, in combination with a GEANT4 model, to estimate the galactic cosmic ray differential energy spectrum over the course of the mission.
Published: 2017
Full Text: View/download PDF

21. The CARMENES search for exoplanets around M dwarfs: High-resolution optical and near-infrared spectroscopy of 324 survey stars

Author: Reiners, A., Zechmeister, M., Caballero, J. A., Ribas, I., Morales, J. C., Jeffers, S. V., Schöfer, P., Tal-Or, L., Quirrenbach, A., Amado, P. J., Kaminski, A., Seifert, W., Abril, M., Aceituno, J., Alonso-Floriano, F. J., Eiff, M. Ammler-von, Antona, R., Anglada-Escudé, G., Anwand-Heerwart, H., Arroyo-Torres, B., Azzaro, M., Baroch, D., Barrado, D., Bauer, F. F., Becerril, S., Béjar, V. J. S., Benítez, D., Berdiñas, Z. M., Bergond, G., Blümcke, M., Brinkmöller, M., del Burgo, C., Cano, J., Vázquez, M. C. Cárdenas, Casal, E., Cifuentes, C., Claret, A., Colomé, J., Cortés-Contreras, M., Czesla, S., Díez-Alonso, E., Dreizler, S., Feiz, C., Fernández, M., Ferro, I. M., Fuhrmeister, B., Galadí-Enríquez, D., Garcia-Piquer, A., Vargas, M. L. García, Gesa, L., Gómez, V., Galera, Hernández, J. I. González, González-Peinado, R., Grözinger, U., Grohnert, S., Guàrdia, J., Guenther, E. W., Guijarro, A., de Guindos, E., Gutiérrez-Soto, J., Hagen, H. -J., Hatzes, A. P., Hauschildt, P. H., Hedrosa, R. P., Helmling, J., Henning, Th., Hermelo, I., Arabí, R. Hernández, Castaño, L. Hernández, Hernando, F. Hernández, Herrero, E., Huber, A., Huke, P., Johnson, E., de Juan, E., Kim, M., Klein, R., Klüter, J., Klutsch, A., Kürster, M., Lafarga, M., Lamert, A., Lampón, M., Lara, L. M., Laun, W., Lemke, U., Lenzen, R., Launhardt, R., del Fresno, M. López, López-González, J., López-Puertas, M., Salas, J. F. López, López-Santiago, J., Luque, R., Madinabeitia, H. Magán, Mall, U., Mancini, L., Mandel, H., Marfil, E., Molina, J. A. Marín, Maroto, D., Fernández, Martín, E. L., Martín-Ruiz, S., Marvin, C. J., Mathar, R. J., Mirabet, E., Montes, D., Moreno-Raya, M. E., Moya, A., Mundt, R., Nagel, E., Naranjo, V., Nortmann, L., Nowak, G., Ofir, A., Oreiro, R., Pallé, E., Panduro, J., Pascual, J., Passegger, V. M., Pavlov, A., Pedraz, S., Pérez-Calpena, A., Medialdea, D. Pérez, Perger, M., Perryman, M. A. C., Pluto, M., Rabaza, O., Ramón, A., Rebolo, R., Redondo, P., Reffert, S., Reinhart, S., Rhode, P., Rix, H. -W., Rodler, F., Rodríguez, E., Rodríguez-López, C., Trinidad, A. Rodríguez, Rohloff, R. -R., Rosich, A., Sadegi, S., Sánchez-Blanco, E., Carrasco, M. A. Sánchez, Sánchez-López, A., Sanz-Forcada, J., Sarkis, P., Sarmiento, L. F., Schäfer, S., Schmitt, J. H. M. M., Schiller, J., Schweitzer, A., Solano, E., Stahl, O., Strachan, J. B. P., Stürmer, J., Suárez, J. C., Tabernero, H. M., Tala, M., Trifonov, T., Tulloch, S. M., Ulbrich, R. G., Veredas, G., Linares, J. I. Vico, Vilardell, F., Wagner, K., Winkler, J., Wolthoff, V., Xu, W., Yan, F., and Osorio, M. R. Zapatero
Subjects: Astrophysics - Solar and Stellar Astrophysics, Astrophysics - Earth and Planetary Astrophysics
Abstract: The CARMENES radial velocity (RV) survey is observing 324 M dwarfs to search for any orbiting planets. In this paper, we present the survey sample by publishing one CARMENES spectrum for each M dwarf. These spectra cover the wavelength range 520--1710nm at a resolution of at least $R > 80,000$, and we measure its RV, H$\alpha$ emission, and projected rotation velocity. We present an atlas of high-resolution M-dwarf spectra and compare the spectra to atmospheric models. To quantify the RV precision that can be achieved in low-mass stars over the CARMENES wavelength range, we analyze our empirical information on the RV precision from more than 6500 observations. We compare our high-resolution M-dwarf spectra to atmospheric models where we determine the spectroscopic RV information content, $Q$, and signal-to-noise ratio. We find that for all M-type dwarfs, the highest RV precision can be reached in the wavelength range 700--900nm. Observations at longer wavelengths are equally precise only at the very latest spectral types (M8 and M9). We demonstrate that in this spectroscopic range, the large amount of absorption features compensates for the intrinsic faintness of an M7 star. To reach an RV precision of 1ms$^{-1}$ in very low mass M dwarfs at longer wavelengths likely requires the use of a 10m class telescope. For spectral types M6 and earlier, the combination of a red visual and a near-infrared spectrograph is ideal to search for low-mass planets and to distinguish between planets and stellar variability. At a 4m class telescope, an instrument like CARMENES has the potential to push the RV precision well below the typical jitter level of 3-4ms$^{-1}$., Comment: accepted for publication in A&A, 13 pages plus 40 pages spectral atlas, first 10 atlas pages are reduced in quality to fit arXiv size limit; one CARMENES spectrum for each of the 324 stars is published in electronic format at http://carmenes.cab.inta-csic.es/
Published: 2017
Full Text: View/download PDF

22. The CARMENES search for exoplanets around M dwarfs. First visual-channel radial-velocity measurements and orbital parameter updates of seven M-dwarf planetary systems

Author: Trifonov, T., Kürster, M., Zechmeister, M., Tal-Or, L., Caballero, J. A., Quirrenbach, A., Amado, P. J., Ribas, I., Reiners, A., Reffert, S., Dreizler, S., Hatzes, A. P., Kaminski, A., Launhardt, R., Henning, Th., Montes, D., Béjar, V. J. S., Mundt, R., Pavlov, A., Schmitt, J. H. M. M., Seifert, W., Morales, J. C., Nowak, G., Jeffers, S. V., Rodríguez-López, C., del Burgo, C., Anglada-Escudé, G., López-Santiago, J., Mathar, R. J., Eiff, M. Ammler-von, Guenther, E. W., Barrado, D., Hernández, J. I. González, Mancini, L., Stürmer, J., Abril, M., Aceituno, J., Alonso-Floriano, F. J., Antona, R., Anwand-Heerwart, H., Arroyo-Torres, B., Azzaro, M., Baroch, D., Bauer, F. F., Becerril, S., Benítez, D., Berdiñas, Z. M., Bergond, G., Blümcke, M., Brinkmöller, M., Cano, J., Vázquez, M. C. Cárdenas, Casal, E., Cifuentes, C., Claret, A., Colomé, J., Cortés-Contreras, M., Czesla, S., Díez-Alonso, E., Feiz, C., Fernández, M., Ferro, I. M., Fuhrmeister, B., Galadí-Enríquez, D., Garcia-Piquer, A., Vargas, M. L. García, Gesa, L., Galera, V. Gómez, González-Peinado, R., Grözinger, U., Grohnert, S., Guàrdia, J., Guijarro, A., de Guindos, E., Gutiérrez-Soto, J., Hagen, H. -J., Hauschildt, P. H., Hedrosa, R. P., Helmling, J., Hermelo, I., Arabí, R. Hernández, Castaño, L. Hernández, Hernando, F. Hernández, Herrero, E., Huber, A., Huke, P., Johnson, E., de Juan, E., Kim, M., Klein, R., Klüter, J., Klutsch, A., Lafarga, M., Lampón, M., Lara, L. M., Laun, W., Lemke, U., Lenzen, R., del Fresno, M. López, López-González, J., López-Puertas, M., Salas, J. F. López, Luque, R., Madinabeitia, H. Magán, Mall, U., Mandel, H., Marfil, E., Molina, J. A. Marín, Fernández, D. Maroto, Martín, E. L., Martín-Ruiz, S., Marvin, C. J., Mirabet, E., Moya, A., Moreno-Raya, M. E., Nagel, E., Naranjo, V., Nortmann, L., Ofir, A., Oreiro, R., Pallé, E., Panduro, J., Pascual, J., Passegger, V. M., Pedraz, S., Pérez-Calpena, A., Medialdea, D. Pérez, Perger, M., Perryman, M. A. C., Pluto, M., Rabaza, O., Ramón, A., Rebolo, R., Redondo, P., Reinhardt, S., Rhode, P., Rix, H. -W., Rodler, F., Rodríguez, E., Trinidad, A. Rodríguez, Rohloff, R. -R., Rosich, A., Sadegi, S., Sánchez-Blanco, E., Carrasco, M. A. Sánchez, Sánchez-López, A., Sanz-Forcada, J., Sarkis, P., Sarmiento, L. F., Schäfer, S., Schiller, J., Schöfer, P., Schweitzer, A., Solano, E., Stahl, O., Strachan, J. B. P., Suárez, J. C., Tabernero, H. M., Tala, M., Tulloch, S. M., Veredas, G., Linares, J. I. Vico, Vilardell, F., Wagner, K., Winkler, J., Wolthoff, V., Xu, W., Yan, F., and Osorio, M. R. Zapatero
Subjects: Astrophysics - Earth and Planetary Astrophysics
Abstract: Context: The main goal of the CARMENES survey is to find Earth-mass planets around nearby M-dwarf stars. Seven M-dwarfs included in the CARMENES sample had been observed before with HIRES and HARPS and either were reported to have one short period planetary companion (GJ15A, GJ176, GJ436, GJ536 and GJ1148) or are multiple planetary systems (GJ581 and GJ876). Aims: We aim to report new precise optical radial velocity measurements for these planet hosts and test the overall capabilities of CARMENES. Methods: We combined our CARMENES precise Doppler measurements with those available from HIRES and HARPS and derived new orbital parameters for the systems. Bona-fide single planet systems are fitted with a Keplerian model. The multiple planet systems were analyzed using a self-consistent dynamical model and their best fit orbits were tested for long-term stability. Results: We confirm or provide supportive arguments for planets around all the investigated stars except for GJ15A, for which we find that the post-discovery HIRES data and our CARMENES data do not show a signal at 11.4 days. Although we cannot confirm the super-Earth planet GJ15Ab, we show evidence for a possible long-period ($P_{\rm c}$ = 7025$_{-629}^{+972}$ d) Saturn-mass ($m_{\rm c} \sin i$ = 51.8$_{-5.8}^{+5.5}M_\oplus$) planet around GJ15A. In addition, based on our CARMENES and HIRES data we discover a second planet around GJ1148, for which we estimate a period $P_{\rm c}$ = 532.6$_{-2.5}^{+4.1}$ d, eccentricity $e_{\rm c}$ = 0.34$_{-0.06}^{+0.05}$ and minimum mass $m_{\rm c} \sin i$ = 68.1$_{-2.2}^{+4.9}M_\oplus$. Conclusions: The CARMENES optical radial velocities have similar precision and overall scatter when compared to the Doppler measurements conducted with HARPS and HIRES. We conclude that CARMENES is an instrument that is up to the challenge of discovering rocky planets around low-mass stars., Comment: Accepted for publication in A&A, 24 pages, 16 figures, 14 tables
Published: 2017
Full Text: View/download PDF

23. Charge-induced force-noise on free-falling test masses: results from LISA Pathfinder

Author: Armano, M., Audley, H., Auger, G., Baird, J. T., Binetruy, P., Born, M., Bortoluzzi, D., Brandt, N., Bursi, A., Caleno, M., Cavalleri, A., Cesarini, A., Cruise, M., Danzmann, K., Silva, M. de Deus, Diepholz, I., Dolesi, R., Dunbar, N., Ferraioli, L., Ferroni, V., Fitzsimons, E. D., Flatscher, R., Freschi, M., Gallegos, J., Marirrodriga, C. García, Gerndt, R., Gesa, L., Gibert, F., Giardini, D., Giusteri, R., Grimani, C., Grzymisch, J., Harrison, I., Heinzel, G., Hewitson, M., Hollington, D., Hueller, M., Huesler, J., Inchauspé, H., Jennrich, O., Jetzer, P., Johlander, B., Karnesis, N., Kaune, B., Killow, C. J., Korsakova, N., Lloro, I., Liu, L., Maarschalkerweerd, R., Madden, S., Mance, D., Martín, V., Martin-Polo, L., Martino, J., Martin-Porqueras, F., Mateos, I., McNamara, P. W., Mendes, J., Mendes, L., Moroni, A., Nofrarias, M., Paczkowski, S., Perreur-Lloyd, M., Petiteau, A., Pivato, P., Plagnol, E., Prat, P., Ragnit, U., Ramos-Castro, J., Reiche, J., Perez, J. A. Romera, Robertson, D. I., Rozemeijer, H., Rivas, F., Russano, G., Sarra, P., Schleicher, A., Slutsky, J., Sopuerta, C., Sumner, T. J., Texier, D., Thorpe, J. I., Trenkel, C., Vetrugno, D., Vitale, S., Wanner, G., Ward, H., Wass, P. J., Wealthy, D., Weber, W. J., Wittchen, A., Zanoni, C., Ziegler, T., and Zweifel, P.
Subjects: Astrophysics - Instrumentation and Methods for Astrophysics
Abstract: We report on electrostatic measurements made on board the European Space Agency mission LISA Pathfinder. Detailed measurements of the charge-induced electrostatic forces exerted on free-falling test masses (TMs) inside the capacitive gravitational reference sensor are the first made in a relevant environment for a space-based gravitational wave detector. Employing a combination of charge control and electric-field compensation, we show that the level of charge-induced acceleration noise on a single TM can be maintained at a level close to 1.0 fm/s^2/sqrt(Hz) across the 0.1-100 mHz frequency band that is crucial to an observatory such as LISA. Using dedicated measurements that detect these effects in the differential acceleration between the two test masses, we resolve the stochastic nature of the TM charge build up due to interplanetary cosmic rays and the TM charge-to-force coupling through stray electric fields in the sensor. All our measurements are in good agreement with predictions based on a relatively simple electrostatic model of the LISA Pathfinder instrument., Comment: 9 Pages, 3 figures
Published: 2017
Full Text: View/download PDF

24. In-flight testing of the injection of the LISA Pathfinder test mass into a geodesic

Author: Bortoluzzi, D., Vignotto, D., Zambotti, A., Armano, M., Audley, H., Baird, J., Binetruy, P., Born, M., Castelli, E., Cavalleri, A., Cesarini, A., Cruise, A.M., Danzmann, K., de Deus Silva, M., Diepholz, I., Dixon, G., Dolesi, R., Ferraioli, L., Ferroni, V., Fitzsimons, E.D., Freschi, M., Gesa, L., Gibert, F., Giardini, D., Giusteri, R., Grimani, C., Grzymisch, J., Harrison, I., Hartig, M.-S., Heinzel, G., Hewitson, M., Hollington, D., Hoyland, D., Hueller, M., Inchauspé, H., Jennrich, O., Jetzer, P., Karnesis, N., Kaune, B., Korsakova, N., Killow, C.J., Lobo, J.A., Liu, L., López-Zaragoza, J.P., Maarschalkerweerd, R., Mance, D., Meshksar, N., Martín, V., Martin-Polo, L., Martino, J., Martin-Porqueras, F., McNamara, P.W., Mendes, J., Mendes, L., Nofrarias, M., Paczkowski, S., Perreur-Lloyd, M., Petiteau, A., Pivato, P., Plagnol, E., Ramos-Castro, J., Reiche, J., Robertson, D.I., Rivas, F., Russano, G., Slutsky, J., Sopuerta, C.F., Sumner, T., Texier, D., Thorpe, J.I., Vetrugno, D., Vitale, S., Wanner, G., Ward, H., Wass, P.J., Weber, W.J., Wissel, L., Wittchen, A., Zweifel, P., and Zanoni, Carlo
Published: 2021
Full Text: View/download PDF

25. The EChO science case

Author: Tinetti, Giovanna, Drossart, Pierre, Eccleston, Paul, Hartogh, Paul, Isaak, Kate, Linder, Martin, Lovis, Christophe, Micela, Giusi, Ollivier, Marc, Puig, Ludovic, Ribas, Ignasi, Snellen, Ignas, Allard, Bruce Swinyard. France, Barstow, Joanna, Cho, James, Coustenis, Athena, Cockell, Charles, Correia, Alexandre, Decin, Leen, de Kok, Remco, Deroo, Pieter, Encrenaz, Therese, Forget, Francois, Glasse, Alistair, Griffith, Caitlin, Guillot, Tristan, Koskinen, Tommi, Lammer, Helmut, Leconte, Jeremy, Maxted, Pierre, Mueller-Wodarg, Ingo, Nelson, Richard, North, Chris, Pallé, Enric, Pagano, Isabella, Piccioni, Guseppe, Pinfield, David, Selsis, Franck, Sozzetti, Alessandro, Stixrude, Lars, Tennyson, Jonathan, Turrini, Diego, Beaulieu, Mariarosa Zapatero-Osorio. Jean-Philippe, Grodent, Denis, Guedel, Manuel, Luz, David, Nørgaard-Nielsen, Hans Ulrik, Ray, Tom, Rickman, Hans, Selig, Avri, Banaszkiewicz, Mark Swain. Marek, Barlow, Mike, Bowles, Neil, Branduardi-Raymont, Graziella, Foresto, Vincent Coudé du, Gerard, Jean-Claude, Gizon, Laurent, Hornstrup, Allan, Jarchow, Christopher, Kerschbaum, Franz, Kovacs, Géza, Lagage, Pierre-Olivier, Lim, Tanya, Lopez-Morales, Mercedes, Malaguti, Giuseppe, Pace, Emanuele, Pascale, Enzo, Vandenbussche, Bart, Wright, Gillian, Adriani, Gonzalo Ramos Zapata. Alberto, Azzollini, Ruymán, Balado, Ana, Bryson, Ian, Burston, Raymond, Colomé, Josep, Crook, Martin, Di Giorgio, Anna, Griffin, Matt, Hoogeveen, Ruud, Ottensamer, Roland, Irshad, Ranah, Middleton, Kevin, Morgante, Gianluca, Pinsard, Frederic, Rataj, Mirek, Reess, Jean-Michel, Savini, Giorgio, Schrader, Jan-Rutger, Stamper, Richard, Abe, Berend Winter. L., Abreu, M., Achilleos, N., Ade, P., Adybekian, V., Affer, L., Agnor, C., Agundez, M., Alard, C., Alcala, J., Prieto, C. Allende, Floriano, F. J. Alonso, Altieri, F., Iglesias, C. A. Alvarez, Amado, P., Andersen, A., Aylward, A., Baffa, C., Bakos, G., Ballerini, P., Banaszkiewicz, M., Barber, R. J., Barrado, D., Barton, E. J., Batista, V., Bellucci, G., Avilés, J. A. Belmonte, Berry, D., Bézard, B., Biondi, D., Błęcka, M., Boisse, I., Bonfond, B., Bordé, P., Börner, P., Bouy, H., Brown, L., Buchhave, L., Budaj, J., Bulgarelli, A., Burleigh, M., Cabral, A., Capria, M. T., Cassan, A., Cavarroc, C., Cecchi-Pestellini, C., Cerulli, R., Chadney, J., Chamberlain, S., Charnoz, S., Jessen, N. Christian, Ciaravella, A., Claret, A., Claudi, R., Coates, A., Cole, R., Collura, A., Cordier, D., Covino, E., Danielski, C., Damasso, M., Deeg, H. J., Delgado-Mena, E., Del Vecchio, C., Demangeon, O., De Sio, A., De Wit, J., Dobrijévic, M., Doel, P., Dominic, C., Dorfi, E., Eales, S., Eiroa, C., Contreras, M. Espinoza, Esposito, M., Eymet, V., Fabrizio, N., Fernández, M., Castella, B. Femenía, Figueira, P., Filacchione, G., Fletcher, L., Focardi, M., Fossey, S., Fouqué, P., Frith, J., Galand, M., Gambicorti, L., Gaulme, P., López, R. J. García, Garcia-Piquer, A., Gear, W., Gerard, J. -C., Gesa, L., Giani, E., Gianotti, F., Gillon, M., Giro, E., Giuranna, M., Gomez, H., Gomez-Leal, I., Hernandez, J. Gonzalez, Merino, B. González, Graczyk, R., Grassi, D., Guardia, J., Guio, P., Gustin, J., Hargrave, P., Haigh, J., Hébrard, E., Heiter, U., Heredero, R. L., Herrero, E., Hersant, F., Heyrovsky, D., Hollis, M., Hubert, B., Hueso, R., Israelian, G., Iro, N., Irwin, P., Jacquemoud, S., Jones, G., Jones, H., Justtanont, K., Kehoe, T., Kerschbaum, F., Kerins, E., Kervella, P., Kipping, D., Koskinen, T., Krupp, N., Lahav, O., Laken, B., Lanza, N., Lellouch, E., Leto, G., Goldaracena, J. Licandro, Lithgow-Bertelloni, C., Liu, S. J., Cicero, U. Lo, Lodieu, N., Lognonné, P., Lopez-Puertas, M., Lopez-Valverde, M. A., Rasmussen, I. Lundgaard, Luntzer, A., Machado, P., MacTavish, C., Maggio, A., Maillard, J. -P., Magnes, W., Maldonado, J., Mall, U., Marquette, J. -B., Mauskopf, P., Massi, F., Maurin, A. -S., Medvedev, A., Michaut, C., Miles-Paez, P., Montalto, M., Rodríguez, P. Montañés, Monteiro, M., Montes, D., Morais, H., Morales, J. C., Morales-Calderón, M., Morello, G., Martín, A. Moro, Moses, J., Bedon, A. Moya, Alcaino, F. Murgas, Oliva, E., Orton, G., Palla, F., Pancrazzi, M., Pantin, E., Parmentier, V., Parviainen, H., Ramírez, K. Y. Peña, Peralta, J., Perez-Hoyos, S., Petrov, R., Pezzuto, S., Pietrzak, R., Pilat-Lohinger, E., Piskunov, N., Prinja, R., Prisinzano, L., Polichtchouk, I., Poretti, E., Radioti, A., Ramos, A. A., Rank-Lüftinger, T., Read, P., Readorn, K., López, R. Rebolo, Rebordão, J., Rengel, M., Rezac, L., Rocchetto, M., Rodler, F., Béjar, V. J. Sánchez, Lavega, A. Sanchez, Sanromá, E., Santos, N., Forcada, J. Sanz, Scandariato, G., Schmider, F. -X., Scholz, A., Scuderi, S., Sethenadh, J., Shore, S., Showman, A., Sicardy, B., Sitek, P., Smith, A., Soret, L., Sousa, S., Stiepen, A., Stolarski, M., Strazzulla, G., Tabernero, H. M, Tanga, P., Tecsa, M., Temple, J., Terenzi, L., Tessenyi, M., Testi, L., Thompson, S., Thrastarson, H., Tingley, B. W., Trifoglio, M., Torres, J. Martín, Tozzi, A., Turrini, D., Varley, R., Vakili, F., de Val-Borro, M., Valdivieso, M. L., Venot, O., Villaver, E., Vinatier, S., Viti, S., Waldmann, I., Waltham, D., Ward-Thompson, D., Waters, R., Watkins, C., Watson, D., Wawer, P., Wawrzaszk, A., White, G., Widemann, T., Winek, W., Wiśniowski, T., Yelle, R., Yung, Y., and Yurchenko, S. N.
Subjects: Astrophysics - Earth and Planetary Astrophysics
Abstract: The discovery of almost 2000 exoplanets has revealed an unexpectedly diverse planet population. Observations to date have shown that our Solar System is certainly not representative of the general population of planets in our Milky Way. The key science questions that urgently need addressing are therefore: What are exoplanets made of? Why are planets as they are? What causes the exceptional diversity observed as compared to the Solar System? EChO (Exoplanet Characterisation Observatory) has been designed as a dedicated survey mission for transit and eclipse spectroscopy capable of observing a large and diverse planet sample within its four-year mission lifetime. EChO can target the atmospheres of super-Earths, Neptune-like, and Jupiter-like planets, in the very hot to temperate zones (planet temperatures of 300K-3000K) of F to M-type host stars. Over the next ten years, several new ground- and space-based transit surveys will come on-line (e.g. NGTS, CHEOPS, TESS, PLATO), which will specifically focus on finding bright, nearby systems. The current rapid rate of discovery would allow the target list to be further optimised in the years prior to EChO's launch and enable the atmospheric characterisation of hundreds of planets. Placing the satellite at L2 provides a cold and stable thermal environment, as well as a large field of regard to allow efficient time-critical observation of targets randomly distributed over the sky. A 1m class telescope is sufficiently large to achieve the necessary spectro-photometric precision. The spectral coverage (0.5-11 micron, goal 16 micron) and SNR to be achieved by EChO, thanks to its high stability and dedicated design, would enable a very accurate measurement of the atmospheric composition and structure of hundreds of exoplanets., Comment: 50 pages, 30 figures. Experimental Astronomy
Published: 2015
Full Text: View/download PDF

26. Endothelial Glycocalyx Hyaluronan: Regulation and Role in Prevention of Diabetic Complications

Author: Wang, Gangqi, Tiemeier, Gesa L., van den Berg, Bernard M., and Rabelink, Ton J.
Published: 2020
Full Text: View/download PDF

27. Sensor noise in LISA Pathfinder : Laser frequency noise and its coupling to the optical test mass readout

Author: Armano, M., primary, Audley, H., additional, Baird, J., additional, Binetruy, P., additional, Born, M., additional, Bortoluzzi, D., additional, Brandt, N., additional, Castelli, E., additional, Cavalleri, A., additional, Cesarini, A., additional, Cruise, A. M., additional, Danzmann, K., additional, de Deus Silva, M., additional, Diepholz, I., additional, Dixon, G., additional, Dolesi, R., additional, Ferraioli, L., additional, Ferroni, V., additional, Fitzsimons, E. D., additional, Flatscher, R., additional, Freschi, M., additional, García, A., additional, Gerndt, R., additional, Gesa, L., additional, Giardini, D., additional, Gibert, F., additional, Giusteri, R., additional, Grimani, C., additional, Grzymisch, J., additional, Guzman, F., additional, Harrison, I., additional, Hartig, M.-S., additional, Hechenblaikner, G., additional, Heinzel, G., additional, Hewitson, M., additional, Hollington, D., additional, Hoyland, D., additional, Hueller, M., additional, Inchauspé, H., additional, Jennrich, O., additional, Jetzer, P., additional, Johann, U., additional, Johlander, B., additional, Karnesis, N., additional, Kaune, B., additional, Killow, C. J., additional, Korsakova, N., additional, Lobo, J. A., additional, López-Zaragoza, J. P., additional, Maarschalkerweerd, R., additional, Mance, D., additional, Martín, V., additional, Martin-Polo, L., additional, Martin-Porqueras, F., additional, Martino, J., additional, McNamara, P. W., additional, Mendes, J., additional, Mendes, L., additional, Meshksar, N., additional, Monsky, A., additional, Nofrarias, M., additional, Paczkowski, S., additional, Perreur-Lloyd, M., additional, Petiteau, A., additional, Plagnol, E., additional, Ramos-Castro, J., additional, Reiche, J., additional, Rivas, F., additional, Robertson, D. I., additional, Russano, G., additional, Sanjuan, J., additional, Slutsky, J., additional, Sopuerta, C. F., additional, Steier, F., additional, Sumner, T., additional, Texier, D., additional, Thorpe, J. I., additional, Vetrugno, D., additional, Vitale, S., additional, Wand, V., additional, Wanner, G., additional, Ward, H., additional, Wass, P. J., additional, Weber, W. J., additional, Wissel, L., additional, Wittchen, A., additional, and Zweifel, P., additional
Published: 2024
Full Text: View/download PDF

28. Towards a FPGA-controlled deep phase modulation interferometer

Author: Terán, M., Martín, V., Gesa, L. l., Mateos, I., Gibert, F., Karnesis, N., Ramos-Castro, J., Schwarze, T. S., Gerberding, O., Heinzel, G., Guzmán, F., and Nofrarias, M.
Subjects: Physics - Instrumentation and Detectors, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract: Deep phase modulation interferometry was proposed as a method to enhance homodyne interferometers to work over many fringes. In this scheme, a sinusoidal phase modulation is applied in one arm while the demodulation takes place as a post-processing step. In this contribution we report on the development to implement this scheme in a fiber coupled interferometer controlled by means of a FPGA, which includes a LEON3 soft-core processor. The latter acts as a CPU and executes a custom made application to communicate with a host PC. In contrast to usual FPGA-based designs, this implementation allows a real-time fine tuning of the parameters involved in the setup, from the control to the post-processing parameters., Comment: Proceedings of the X LISA Symposium, Gainesville, May 18-23, 2014
Published: 2014
Full Text: View/download PDF

29. STE-QUEST - Test of the Universality of Free Fall Using Cold Atom Interferometry

Author: Aguilera, D., Ahlers, H., Battelier, B., Bawamia, A., Bertoldi, A., Bondarescu, R., Bongs, K., Bouyer, P., Braxmaier, C., Cacciapuoti, L., Chaloner, C., Chwalla, M., Ertmer, W., Franz, M., Gaaloul, N., Gehler, M., Gerardi, D., Gesa, L., Gürlebeck, N., Hartwig, J., Hauth, M., Hellmig, O., Herr, W., Herrmann, S., Heske, A., Hinton, A., Ireland, P., Jetzer, P., Johann, U., Krutzik, M., Kubelka, A., Lämmerzahl, C., Landragin, A., Lloro, I., Massonnet, D., Mateos, I., Milke, A., Nofrarias, M., Oswald, M., Peters, A., Posso-Trujillo, K., Rasel, E., Rocco, E., Roura, A., Rudolph, J., Schleich, W., Schubert, C., Schuldt, T., Seidel, S., Sengstock, K., Sopuerta, C. F., Sorrentino, F., Summers, D., Tino, G. M., Trenkel, C., Uzunoglu, N., von Klitzing, W., Walser, R., Wendrich, T., Wenzlawski, A., Weßels, P., Wicht, A., Wille, E., Williams, M., Windpassinger, P., and Zahzam, N.
Subjects: Quantum Physics, General Relativity and Quantum Cosmology, Physics - Atomic Physics, Physics - Space Physics
Abstract: The theory of general relativity describes macroscopic phenomena driven by the influence of gravity while quantum mechanics brilliantly accounts for microscopic effects. Despite their tremendous individual success, a complete unification of fundamental interactions is missing and remains one of the most challenging and important quests in modern theoretical physics. The STE-QUEST satellite mission, proposed as a medium-size mission within the Cosmic Vision program of the European Space Agency (ESA), aims for testing general relativity with high precision in two experiments by performing a measurement of the gravitational redshift of the Sun and the Moon by comparing terrestrial clocks, and by performing a test of the Universality of Free Fall of matter waves in the gravitational field of Earth comparing the trajectory of two Bose-Einstein condensates of Rb85 and Rb87. The two ultracold atom clouds are monitored very precisely thanks to techniques of atom interferometry. This allows to reach down to an uncertainty in the E\"otv\"os parameter of at least 2x10E-15. In this paper, we report about the results of the phase A mission study of the atom interferometer instrument covering the description of the main payload elements, the atomic source concept, and the systematic error sources., Comment: 21 pages, 5 figures
Published: 2013
Full Text: View/download PDF

30. Lowering the increased intracellular pH of human‐induced pluripotent stem cell‐derived endothelial cells induces formation of mature Weibel‐Palade bodies

Author: Gesa L. Tiemeier, Rozemarijn deKoning, Gangqi Wang, Sarantos Kostidis, Rosalie G. J. Rietjens, Wendy M. P. J. Sol, Sébastien J. Dumas, Martin Giera, Cathelijne W. van denBerg, Jeroen C. J. Eikenboom, Bernard M. van denBerg, Peter Carmeliet, and Ton J. Rabelink
Subjects: cell therapy, glycolysis, induced pluripotent stem cell‐derived endothelial cells, von Willebrand factor, Weibel‐Palade bodies, Medicine (General), R5-920, Cytology, QH573-671
Abstract: Abstract Differentiation of human‐induced pluripotent stem cells (hiPSCs) into vascular endothelium is of great importance to tissue engineering, disease modeling, and use in regenerative medicine. Although differentiation of hiPSCs into endothelial‐like cells (hiPSC‐derived endothelial cells [hiPSC‐ECs]) has been demonstrated before, controversy exists as to what extent these cells faithfully reflect mature endothelium. To address this issue, we investigate hiPSC‐ECs maturation by their ability to express von Willebrand factor (VWF) and formation of Weibel‐Palade bodies (WPBs). Using multiple hiPSCs lines, hiPSC‐ECs failed to form proper VWF and WPBs, essential for angiogenesis, primary and secondary homeostasis. Lowering the increased intracellular pH (pHi) of hiPSC‐ECs with acetic acid did result in the formation of elongated WPBs. Nuclear magnetic resonance data showed that the higher pHi in hiPSC‐ECs occurred in association with decreased intracellular lactate concentrations. This was explained by decreased glycolytic flux toward pyruvate and lactate in hiPSC‐ECs. In addition, decreased expression of monocarboxylate transporter member 1, a member of the solute carrier family (SLC16A1), which regulates lactate and H+ uptake, contributed to the high pHi of hiPSC‐EC. Mechanistically, pro‐VWF dimers require the lower pH environment of the trans‐Golgi network for maturation and tubulation. These data show that while hiPSC‐ECs may share many features with mature EC, they are characterized by metabolic immaturity hampering proper EC function.
Published: 2020
Full Text: View/download PDF

31. State space modelling and data analysis exercises in LISA Pathfinder

Author: Nofrarias, M, Antonucci, F, Armano, M, Audley, H, Auger, G, Benedetti, M, Binetruy, P, Bogenstahl, J, Bortoluzzi, D, Brandt, N, Caleno, M, Cavalleri, A, Congedo, G, Cruise, M, Danzmann, K, De Marchi, F, Diaz-Aguilo, M, Diepholz, I, Dixon, G, Dolesi, R, Dunbar, N, Fauste, J, Ferraioli, L, Fichter, V Ferroni W, Fitzsimons, E, Freschi, M, Marirrodriga, C García, Gerndt, R, Gesa, L, Gibert, F, Giardini, D, Grimani, C, Grynagier, A, Guzmán, F, Harrison, I, Heinzel, G, Hewitson, M, Hollington, D, Hoyland, D, Hueller, M, Huesler, J, Jennrich, O, Jetzer, P, Johlander, B, Karnesis, N, Korsakova, N, Killow, C, Llamas, X, Lloro, I, Lobo, A, Maarschalkerweerd, R, Madden, S, Mance, D, Mateos, I, McNamara, P W, Mendes, J, Mitchell, E, Nicolini, D, Nicolodi, D, Perreur-Lloyd, M, Plagnol, E, Prat, P, Ramos-Castro, J, Reiche, J, Perez, J A Romera, Robertson, D, Rozemeijer, H, Russano, G, Schleicher, A, Shaul, D, Sopuerta, CF, Sumner, T J, Taylor, A, Texier, D, Trenkel, C, Tu, H-B, Vitale, S, Wanner, G, Ward, H, Waschke, S, Wass, P, Wealthy, D, Wen, S, Weber, W J, Ziegler, T, and Zweifel, P
Subjects: General Relativity and Quantum Cosmology, Astrophysics - Instrumentation and Methods for Astrophysics, Physics - Data Analysis, Statistics and Probability, Physics - Instrumentation and Detectors
Abstract: LISA Pathfinder is a mission planned by the European Space Agency to test the key technologies that will allow the detection of gravitational waves in space. The instrument on-board, the LISA Technology package, will undergo an exhaustive campaign of calibrations and noise characterisation campaigns in order to fully describe the noise model. Data analysis plays an important role in the mission and for that reason the data analysis team has been developing a toolbox which contains all the functionalities required during operations. In this contribution we give an overview of recent activities, focusing on the improvements in the modelling of the instrument and in the data analysis campaigns performed both with real and simulated data., Comment: Plenary talk presented at the 9th International LISA Symposium, 21-25 May 2012, Paris
Published: 2013

32. The Gravitational Universe

Author: Consortium, The eLISA, Seoane, P. Amaro, Aoudia, S., Audley, H., Auger, G., Babak, S., Baker, J., Barausse, E., Barke, S., Bassan, M., Beckmann, V., Benacquista, M., Bender, P. L., Berti, E., Binétruy, P., Bogenstahl, J., Bonvin, C., Bortoluzzi, D., Brause, N. C., Brossard, J., Buchman, S., Bykov, I., Camp, J., Caprini, C., Cavalleri, A., Cerdonio, M., Ciani, G., Colpi, M., Congedo, G., Conklin, J., Cornish, N., Danzmann, K., de Vine, G., DeBra, D., Freitag, M. Dewi, Di Fiore, L., Aguilo, M. Diaz, Diepholz, I., Dolesi, R., Dotti, M., Barranco, G. Fernández, Ferraioli, L., Ferroni, V., Finetti, N., Fitzsimons, E., Gair, J., Galeazzi, F., Garcia, A., Gerberding, O., Gesa, L., Giardini, D., Gibert, F., Grimani, C., Groot, P., Cervantes, F. Guzman, Haiman, Z., Halloin, H., Heinzel, G., Hewitson, M., Hogan, C., Holz, D., Hornstrup, A., Hoyland, D., Hoyle, C. D., Hueller, M., Hughes, S., Jetzer, P., Kalogera, V., Karnesis, N., Kilic, M., Killow, C., Klipstein, W., Kochkina, E., Korsakova, N., Krolak, A., Larson, S., Lieser, M., Littenberg, T., Livas, J., Lloro, I., Mance, D., Madau, P., Maghami, P., Mahrdt, C., Marsh, T., Mateos, I., Mayer, L., McClelland, D., McKenzie, K., McWilliams, S., Merkowitz, S., Miller, C., Mitryk, S., Moerschell, J., Mohanty, S., Monsky, A., Mueller, G., Müller, V., Nelemans, G., Nicolodi, D., Nissanke, S., Nofrarias, M., Numata, K., Ohme, F., Otto, M., Perreur-Lloyd, M., Petiteau, A., Phinney, E. S., Plagnol, E., Pollack, S., Porter, E., Prat, P., Preston, A., Prince, T., Reiche, J., Richstone, D., Robertson, D., Rossi, E. M., Rosswog, S., Rubbo, L., Ruiter, A., Sanjuan, J., Sathyaprakash, B. S., Schlamminger, S., Schutz, B., Schütze, D., Sesana, A., Shaddock, D., Shah, S., Sheard, B., Sopuerta, C. F., Spector, A., Spero, R., Stanga, R., Stebbins, R., Stede, G., Steier, F., Sumner, T., Sun, K. -X., Sutton, A., Tanaka, T., Tanner, D., Thorpe, I., Tröbs, M., Tinto, M., Tu, H. -B., Vallisneri, M., Vetrugno, D., Vitale, S., Volonteri, M., Wand, V., Wang, Y., Wanner, G., Ward, H., Ware, B., Wass, P., Weber, W. J., Yu, Y., Yunes, N., and Zweifel, P.
Subjects: Astrophysics - Cosmology and Extragalactic Astrophysics, General Relativity and Quantum Cosmology
Abstract: The last century has seen enormous progress in our understanding of the Universe. We know the life cycles of stars, the structure of galaxies, the remnants of the big bang, and have a general understanding of how the Universe evolved. We have come remarkably far using electromagnetic radiation as our tool for observing the Universe. However, gravity is the engine behind many of the processes in the Universe, and much of its action is dark. Opening a gravitational window on the Universe will let us go further than any alternative. Gravity has its own messenger: Gravitational waves, ripples in the fabric of spacetime. They travel essentially undisturbed and let us peer deep into the formation of the first seed black holes, exploring redshifts as large as z ~ 20, prior to the epoch of cosmic re-ionisation. Exquisite and unprecedented measurements of black hole masses and spins will make it possible to trace the history of black holes across all stages of galaxy evolution, and at the same time constrain any deviation from the Kerr metric of General Relativity. eLISA will be the first ever mission to study the entire Universe with gravitational waves. eLISA is an all-sky monitor and will offer a wide view of a dynamic cosmos using gravitational waves as new and unique messengers to unveil The Gravitational Universe. It provides the closest ever view of the early processes at TeV energies, has guaranteed sources in the form of verification binaries in the Milky Way, and can probe the entire Universe, from its smallest scales around singularities and black holes, all the way to cosmological dimensions., Comment: 20 pages; submitted to the European Space Agency on May 24th, 2013 for the L2/L3 selection of ESA's Cosmic Vision program
Published: 2013

33. From laboratory experiments to LISA Pathfinder: achieving LISA geodesic motion

Author: Antonucci, F, Armano, M, Audley, H, Auger, G, Benedetti, M, Binetruy, P, Boatella, C, Bogenstahl, J, Bortoluzzi, D, Bosetti, P, Brandt, N, Caleno, M, Cavalleri, A, Cesa, M, Chmeissani, M, Ciani, G, Conchillo, A, Congedo, G, Cristofolini, I, Cruise, M, Danzmann, K, De Marchi, F, Diaz-Aguilo, M, Diepholz, I, Dixon, G, Dolesi, R, Dunbar, N, Fauste, J, Ferraioli, L, Fertin, D, Fichter, W, Fitzsimons, E, Freschi, M, Marin, A García, Marirrodriga, C García, Gerndt, R, Gesa, L, Giardini, D, Gibert, F, Grimani, C, Grynagier, A, Guillaume, B, Guzmán, F, Harrison, I, Heinzel, G, Hewitson, M, Hollington, D, Hough, J, Hoyland, D, Hueller, M, Huesler, J, Jeannin, O, Jennrich, O, Jetzer, P, Johlander, B, Killow, C, Llamas, X, Lloro, I, Lobo, A, Maarschalkerweerd, R, Madden, S, Mance, D, Mateos, I, McNamara, P W, Mendestì, J, Mitchell, E, Monsky, A, Nicolini, D, Nicolodi, D, Nofrarias, M, Pedersen, F, Perreur-Lloyd, M, Perreca, A, Plagnol, E, Prat, P, Racca, G D, Rais, B, Ramos-Castro, J, Reiche, J, Perez, J A Romera, Robertson, D, Rozemeijer, H, Sanjuan, J, Schleicher, A, Schulte, M, Shaul, D, Stagnaro, L, Strandmoe, S, Steier, F, Sumner, T J, Taylor, A, Texier, D, Trenkel, C, Tombolato, D, Vitale, S, Wanner, G, Ward, H, Waschke, S, Wass, P, Weber, W J, and Zweifel, P
Subjects: General Relativity and Quantum Cosmology, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract: This paper presents a quantitative assessment of the performance of the upcoming LISA Pathfinder geodesic explorer mission. The findings are based on the results of extensive ground testing and simulation campaigns using flight hardware and flight control and operations algorithms. The results show that, for the central experiment of measuring the stray differential acceleration between the LISA test masses, LISA Pathfinder will be able to verify the overall acceleration noise to within a factor two of the LISA requirement at 1 mHz and within a factor 6 at 0.1 mHz. We also discuss the key elements of the physical model of disturbances, coming from LISA Pathfinder and ground measurement, that will guarantee the LISA performance., Comment: Proceedings of the 8th LISA Symposium. To appear Class. Quantum Grav. 28 (2011)
Published: 2010
Full Text: View/download PDF

34. Tilt-to-length coupling in LISA Pathfinder: A data analysis

Author: Armano, M., primary, Audley, H., additional, Baird, J., additional, Binetruy, P., additional, Born, M., additional, Bortoluzzi, D., additional, Castelli, E., additional, Cavalleri, A., additional, Cesarini, A., additional, Cruise, A. M., additional, Danzmann, K., additional, de Deus Silva, M., additional, Diepholz, I., additional, Dixon, G., additional, Dolesi, R., additional, Ferraioli, L., additional, Ferroni, V., additional, Fitzsimons, E. D., additional, Freschi, M., additional, Gesa, L., additional, Giardini, D., additional, Gibert, F., additional, Giusteri, R., additional, Grimani, C., additional, Grzymisch, J., additional, Harrison, I., additional, Hartig, M-S., additional, Heinzel, G., additional, Hewitson, M., additional, Hollington, D., additional, Hoyland, D., additional, Hueller, M., additional, Inchauspé, H., additional, Jennrich, O., additional, Jetzer, P., additional, Johann, U., additional, Johlander, B., additional, Karnesis, N., additional, Kaune, B., additional, Killow, C. J., additional, Korsakova, N., additional, Lobo, J. A., additional, López-Zaragoza, J. P., additional, Maarschalkerweerd, R., additional, Mance, D., additional, Martín, V., additional, Martin-Polo, L., additional, Martin-Porqueras, F., additional, Martino, J., additional, McNamara, P. W., additional, Mendes, J., additional, Mendes, L., additional, Meshksar, N., additional, Nofrarias, M., additional, Paczkowski, S., additional, Perreur-Lloyd, M., additional, Petiteau, A., additional, Plagnol, E., additional, Ramos-Castro, J., additional, Reiche, J., additional, Rivas, F., additional, Robertson, D. I., additional, Russano, G., additional, Sanjuan, J., additional, Slutsky, J., additional, Sopuerta, C. F., additional, Sumner, T., additional, Tevlin, L., additional, Texier, D., additional, Thorpe, J. I., additional, Vetrugno, D., additional, Vitale, S., additional, Wanner, G., additional, Ward, H., additional, Wass, P. J., additional, Weber, W. J., additional, Wissel, L., additional, Wittchen, A., additional, and Zweifel, P., additional
Published: 2023
Full Text: View/download PDF

35. Closing the Mitochondrial Permeability Transition Pore in hiPSC-Derived Endothelial Cells Induces Glycocalyx Formation and Functional Maturation

Author: Gesa L. Tiemeier, Gangqi Wang, Sébastien J. Dumas, Wendy M.P.J. Sol, M. Cristina Avramut, Tobias Karakach, Valeria V. Orlova, Cathelijne W. van den Berg, Christine L. Mummery, Peter Carmeliet, Bernard M. van den Berg, and Ton J. Rabelink
Subjects: Medicine (General), R5-920, Biology (General), QH301-705.5
Abstract: Summary: Human induced pluripotent stem cells (hiPSCs) are used to study organogenesis and model disease as well as being developed for regenerative medicine. Endothelial cells are among the many cell types differentiated from hiPSCs, but their maturation and stabilization fall short of that in adult endothelium. We examined whether shear stress alone or in combination with pericyte co-culture would induce flow alignment and maturation of hiPSC-derived endothelial cells (hiPSC-ECs) but found no effects comparable with those in primary microvascular ECs. In addition, hiPSC-ECs lacked a luminal glycocalyx, critical for vasculature homeostasis, shear stress sensing, and signaling. We noted, however, that hiPSC-ECs have dysfunctional mitochondrial permeability transition pores, resulting in reduced mitochondrial function and increased reactive oxygen species. Closure of these pores by cyclosporine A improved EC mitochondrial function but also restored the glycocalyx such that alignment to flow took place. These results indicated that mitochondrial maturation is required for proper hiPSC-EC functionality. : Closure of the mitochondrial permeability transition pore by cyclosporine A improved mitochondrial function and maturation of hiPSC-ECs but also restored the glycocalyx such that alignment to flow took place. This functional glycocalyx, necessary for growth factor signaling and anticoagulation, is a prerequisite for future hiPSC-EC applications in tissue engineering, organoid vascularization and therapeutic use of hiPSC-ECs. Keywords: hiPSC-derived endothelial cells, hiPSC-ECs, endothelial cell differentiation, mitochondrial dysfunction, mitochondrial permeability transition pore, reactive oxygen species, cyclosporine A, glycocalyx, shear stress, maturation
Published: 2019
Full Text: View/download PDF

36. The diagnostics subsystem on board LISA PathFinder and LISA

Author: Canizares, P, Conchillo, A, Garcia-Berro, E, Gesa, L, Grimani, C, Lloro, I, Lobo, A, Mateos, I, Nofrarias, M, Ramos-Castro, J, Sanjuan, J, and Sopuerta, CF
Subjects: General Relativity and Quantum Cosmology
Abstract: The Data and Diagnostics Subsystem of the LTP hardware and software are at present essentially ready for delivery. In this presentation we intend to describe the scientific and technical aspects of this subsystem, which includes thermal diagnostics, magnetic diagnostics and a Radiation Monitor, as well as the prospects for their integration within the rest of the LTP. We also sketch a few lines of progress recently opened up towards the more demanding diagnostics requirements which will be needed for LISA., Comment: 11 pages, 5 figures, pdflatex, prepared for the Proceedings of the 7th International LISA Symposium (Barcelona, Spain, 16-20 June-2008), submitted to Classical and Quantum Gravity
Published: 2008
Full Text: View/download PDF

37. Measuring the Galactic Cosmic Ray flux with the LISA Pathfinder radiation monitor

Author: Armano, M., Audley, H., Baird, J., Binetruy, P., Born, M., Bortoluzzi, D., Castelli, E., Cavalleri, A., Cesarini, A., Cruise, A.M., Danzmann, K., de Deus Silva, M., Diepholz, I., Dixon, G., Dolesi, R., Ferraioli, L., Ferroni, V., Finetti, N., Fitzsimons, E.D., Freschi, M., Gesa, L., Gibert, F., Giardini, D., Giusteri, R., Grimani, C., Grzymisch, J., Harrison, I., Heinzel, G., Hewitson, M., Hollington, D., Hoyland, D., Hueller, M., Inchauspé, H., Jennrich, O., Jetzer, P., Karnesis, N., Kaune, B., Korsakova, N., Killow, C.J., Lobo, J.A., Lloro, I., Liu, L., Lopez-Zaragoza, J.P., Maarschalkerweerd, R., Mance, D., Meshskar, N., Martín, V., Martin-Polo, L., Martino, J., Martin-Porqueras, F., Mateos, I., McNamara, P.W., Mendes, J., Mendes, L., Nofrarias, M., Paczkowski, S., Perreur-Lloyd, M., Petiteau, A., Pivato, P., Plagnol, E., Ramos-Castro, J., Reiche, J., Robertson, D.I., Rivas, F., Russano, G., Slutsky, J., Sopuerta, C.F., Sumner, T., Texier, D., Thorpe, J.I., Vetrugno, D., Vitale, S., Wanner, G., Ward, H., Wass, P., Weber, W.J., Wissel, L., Wittchen, A., and Zweifel, P.
Published: 2018
Full Text: View/download PDF

38. Neuroscience-Inspired, Behavioral Change Program for University Students

Author: Hudziak, James J. and Tiemeier, Gesa L.
Published: 2017
Full Text: View/download PDF

39. Shear Stress Regulation of Endothelial Glycocalyx Structure Is Determined by Glucobiosynthesis

Author: Wang, Gangqi, Kostidis, Sarantos, Tiemeier, Gesa L., Sol, Wendy M.P.J., de Vries, Margreet R., Giera, Martin, Carmeliet, Peter, van den Berg, Bernard M., and Rabelink, Ton J.
Published: 2020
Full Text: View/download PDF

40. Charging of free-falling test masses in orbit due to cosmic rays: Results from LISA Pathfinder

Author: Armano, M., primary, Audley, H., additional, Baird, J., additional, Binetruy, P., additional, Born, M., additional, Bortoluzzi, D., additional, Castelli, E., additional, Cavalleri, A., additional, Cesarini, A., additional, Cruise, A. M., additional, Danzmann, K., additional, de Deus Silva, M., additional, Diepholz, I., additional, Dixon, G., additional, Dolesi, R., additional, Ferraioli, L., additional, Ferroni, V., additional, Fitzsimons, E. D., additional, Freschi, M., additional, Gesa, L., additional, Giardini, D., additional, Gibert, F., additional, Giusteri, R., additional, Grimani, C., additional, Grzymisch, J., additional, Harrison, I., additional, Hartig, M.-S., additional, Heinzel, G., additional, Hewitson, M., additional, Hollington, D., additional, Hoyland, D., additional, Hueller, M., additional, Inchauspé, H., additional, Jennrich, O., additional, Jetzer, P., additional, Karnesis, N., additional, Kaune, B., additional, Killow, C. J., additional, Korsakova, N., additional, Lobo, J. A., additional, López-Zaragoza, J. P., additional, Maarschalkerweerd, R., additional, Mance, D., additional, Martín, V., additional, Martino, J., additional, Martin-Polo, L., additional, Martin-Porqueras, F., additional, McNamara, P. W., additional, Mendes, J., additional, Mendes, L., additional, Meshksar, N., additional, Nofrarias, M., additional, Paczkowski, S., additional, Perreur-Lloyd, M., additional, Petiteau, A., additional, Plagnol, E., additional, Ramos-Castro, J., additional, Reiche, J., additional, Rivas, F., additional, Robertson, D. I., additional, Russano, G., additional, Slutsky, J., additional, Sopuerta, C. F., additional, Sumner, T. J., additional, Texier, D., additional, Thorpe, J. I., additional, Vetrugno, D., additional, Vitale, S., additional, Wanner, G., additional, Ward, H., additional, Wass, P. J., additional, Weber, W. J., additional, Wissel, L., additional, Wittchen, A., additional, and Zweifel, P., additional
Published: 2023
Full Text: View/download PDF

41. Tilt-to-length coupling in LISA Pathfinder: A data analysis

Author: Armano, M., Audley, H., Baird, J., Binetruy, P., Born, M., Bortoluzzi, D., Castelli, E., Cavalleri, A., Cesarini, A., Cruise, A. M., Danzmann, K., de Deus Silva, M., Diepholz, I., Dixon, G., Dolesi, R., Ferraioli, L., Ferroni, V., Fitzsimons, E. D., Freschi, M., Gesa, L., Giardini, D., Gibert, F., Giusteri, R., Grimani, C., Grzymisch, J., Harrison, I., Hartig, M-S., Heinzel, G., Hewitson, M., Hollington, D., Hoyland, D., Hueller, M., Inchauspé, H., Jennrich, O., Jetzer, P., Johann, U., Johlander, B., Karnesis, N., Kaune, B., Killow, C. J., Korsakova, N., Lobo, J. A., López-Zaragoza, J. P., Maarschalkerweerd, R., Mance, D., Martín, V., Martin-Polo, L., Martin-Porqueras, F., Martino, J., McNamara, P. W., Mendes, J., Mendes, L., Meshksar, N., Nofrarias, M., Paczkowski, S., Perreur-Lloyd, M., Petiteau, A., Plagnol, E., Ramos-Castro, J., Reiche, J., Rivas, F., Robertson, D. I., Russano, G., Sanjuan, J., Slutsky, J., Sopuerta, C. F., Sumner, T., Tevlin, L., Texier, D., Thorpe, J. I., Vetrugno, D., Vitale, S., Wanner, G., Ward, H., Wass, P. J., Weber, W. J., Wissel, L., Wittchen, A., Zweifel, P., Armano, M., Audley, H., Baird, J., Binetruy, P., Born, M., Bortoluzzi, D., Castelli, E., Cavalleri, A., Cesarini, A., Cruise, A. M., Danzmann, K., de Deus Silva, M., Diepholz, I., Dixon, G., Dolesi, R., Ferraioli, L., Ferroni, V., Fitzsimons, E. D., Freschi, M., Gesa, L., Giardini, D., Gibert, F., Giusteri, R., Grimani, C., Grzymisch, J., Harrison, I., Hartig, M-S., Heinzel, G., Hewitson, M., Hollington, D., Hoyland, D., Hueller, M., Inchauspé, H., Jennrich, O., Jetzer, P., Johann, U., Johlander, B., Karnesis, N., Kaune, B., Killow, C. J., Korsakova, N., Lobo, J. A., López-Zaragoza, J. P., Maarschalkerweerd, R., Mance, D., Martín, V., Martin-Polo, L., Martin-Porqueras, F., Martino, J., McNamara, P. W., Mendes, J., Mendes, L., Meshksar, N., Nofrarias, M., Paczkowski, S., Perreur-Lloyd, M., Petiteau, A., Plagnol, E., Ramos-Castro, J., Reiche, J., Rivas, F., Robertson, D. I., Russano, G., Sanjuan, J., Slutsky, J., Sopuerta, C. F., Sumner, T., Tevlin, L., Texier, D., Thorpe, J. I., Vetrugno, D., Vitale, S., Wanner, G., Ward, H., Wass, P. J., Weber, W. J., Wissel, L., Wittchen, A., and Zweifel, P.
Abstract: We present a study of the tilt-to-length coupling noise during the LISA Pathfinder mission and how it depended on the system's alignment. Tilt-to-length coupling noise is the unwanted coupling of angular and lateral spacecraft or test mass motion into the primary interferometric displacement readout. It was one of the major noise sources in the LISA Pathfinder mission and is likewise expected to be a primary noise source in LISA. We demonstrate here that a recently derived and published analytical model describes the dependency of the LISA Pathfinder tilt-to-length coupling noise on the alignment of the two freely falling test masses. This was verified with the data taken before and after the realignments performed in March (engineering days) and June 2016, and during a two-day experiment in February 2017 (long cross-talk experiment). The latter was performed with the explicit goal of testing the tilt-to-length coupling noise dependency on the test mass alignment. Using the analytical model, we show that all realignments performed during the mission were only partially successful and explain the reasons why. In addition to the analytical model, we computed another physical tilt-to-length coupling model via a minimizing routine making use of the long cross-talk experiment data. A similar approach could prove useful for the LISA mission.
Published: 2023

42. Charging of free-falling test masses in orbit due to cosmic rays: Results from LISA Pathfinder

Author: Armano, M., Audley, H., Baird, J., Binetruy, P., Born, M., Bortoluzzi, D., Castelli, E., Cavalleri, A., Cesarini, A., Cruise, A.M., Danzmann, K., De Deus, Silva M., Diepholz, I., Dixon, G., Dolesi, R., Ferraioli, L., Ferroni, V., Fitzsimons, E.D., Freschi, M., Gesa, L., Giardini, D., Gibert, F., Giusteri, R., Grimani, C., Grzymisch, J., Harrison, I., Hartig, M.-S., Heinzel, G., Hewitson, M., Hollington, D., Hoyland, D., Hueller, M., Inchauspé, H., Jennrich, O., Jetzer, P., Karnesis, N., Kaune, B., Killow, C.J., Korsakova, N., Lobo, J.A., López-Zaragoza, J.P., Maarschalkerweerd, R., Mance, D., Martín, V., Martino, J., Martin-Polo, L., Martin-Porqueras, F., McNamara, P.W., Mendes, J., Mendes, L., Meshksar, N., Nofrarias, M., Paczkowski, S., Perreur-Lloyd, M., Petiteau, A., Plagnol, E., Ramos-Castro, J., Reiche, J., Rivas, F., Robertson, D.I., Russano, G., Slutsky, J., Sopuerta, C.F., Sumner, T.J., Texier, D., Thorpe, J.I., Vetrugno, D., Vitale, S., Wanner, G., Ward, H., Wass, P.J., Weber, W.J., Wissel, L., Wittchen, A., Zweifel, P., Armano, M., Audley, H., Baird, J., Binetruy, P., Born, M., Bortoluzzi, D., Castelli, E., Cavalleri, A., Cesarini, A., Cruise, A.M., Danzmann, K., De Deus, Silva M., Diepholz, I., Dixon, G., Dolesi, R., Ferraioli, L., Ferroni, V., Fitzsimons, E.D., Freschi, M., Gesa, L., Giardini, D., Gibert, F., Giusteri, R., Grimani, C., Grzymisch, J., Harrison, I., Hartig, M.-S., Heinzel, G., Hewitson, M., Hollington, D., Hoyland, D., Hueller, M., Inchauspé, H., Jennrich, O., Jetzer, P., Karnesis, N., Kaune, B., Killow, C.J., Korsakova, N., Lobo, J.A., López-Zaragoza, J.P., Maarschalkerweerd, R., Mance, D., Martín, V., Martino, J., Martin-Polo, L., Martin-Porqueras, F., McNamara, P.W., Mendes, J., Mendes, L., Meshksar, N., Nofrarias, M., Paczkowski, S., Perreur-Lloyd, M., Petiteau, A., Plagnol, E., Ramos-Castro, J., Reiche, J., Rivas, F., Robertson, D.I., Russano, G., Slutsky, J., Sopuerta, C.F., Sumner, T.J., Texier, D., Thorpe, J.I., Vetrugno, D., Vitale, S., Wanner, G., Ward, H., Wass, P.J., Weber, W.J., Wissel, L., Wittchen, A., and Zweifel, P.
Abstract: A comprehensive summary of the measurements made to characterize test-mass charging due to the space environment during the LISA Pathfinder mission is presented. Measurements of the residual charge of the test mass after release by the grabbing and positioning mechanism show that the initial charge of the test masses was negative after all releases, leaving the test mass with a potential in the range from -12 to -512. Variations in the neutral test-mass charging rate between 21.7 and 30.7 e s-1 were observed over the course of the 17-month science operations produced by cosmic ray flux changes including a Forbush decrease associated with a small solar energetic particle event. A dependence of the cosmic ray charging rate on the test-mass potential between -30.2 and -40.3 e s-1 V-1 was observed resulting in an equilibrium test-mass potential between 670 and 960 mV, and this is attributed to a contribution to charging from low-energy electrons emitted from the gold surfaces of the gravitational reference sensor. Data from the onboard particle detector show a reliable correlation with the charging rate and with other environmental monitors of the cosmic ray flux. This correlation is exploited to extrapolate test-mass charging rates to a 20-year period giving useful insight into the expected range of charging rate that may be observed in the LISA mission.
Published: 2023

43. Charging of free-falling test masses in orbit due to cosmic rays: Results from LISA Pathfinder

Author: Armano, M, Audley, H, Baird, J, Jetzer, Philippe, Born, M, Bortoluzzi, D, Castelli, E, Cavalleri, A, Cesarini, A, Cruise, A M, Danzmann, K, de Deus Silva, M, Diepholz, I, Dixon, G, Dolesi, R, Ferraioli, L, Ferroni, V, Fitzsimons, E D, Freschi, M, Gesa, L, Giardini, D, Gibert, F, Giusteri, R, Grimani, C, Grzymisch, J, Harrison, I, Hartig, M-S; https://orcid.org/0000-0002-1078-3497, Heinzel, G, Hewitson, M, Hollington, D, et al, Armano, M, Audley, H, Baird, J, Jetzer, Philippe, Born, M, Bortoluzzi, D, Castelli, E, Cavalleri, A, Cesarini, A, Cruise, A M, Danzmann, K, de Deus Silva, M, Diepholz, I, Dixon, G, Dolesi, R, Ferraioli, L, Ferroni, V, Fitzsimons, E D, Freschi, M, Gesa, L, Giardini, D, Gibert, F, Giusteri, R, Grimani, C, Grzymisch, J, Harrison, I, Hartig, M-S; https://orcid.org/0000-0002-1078-3497, Heinzel, G, Hewitson, M, Hollington, D, and et al
Abstract: A comprehensive summary of the measurements made to characterize test-mass charging due to the space environment during the LISA Pathfinder mission is presented. Measurements of the residual charge of the test mass after release by the grabbing and positioning mechanism show that the initial charge of the test masses was negative after all releases, leaving the test mass with a potential in the range from −12 to −512. Variations in the neutral test-mass charging rate between 21.7 and 30.7 e s$^{−1}$ were observed over the course of the 17-month science operations produced by cosmic ray flux changes including a Forbush decrease associated with a small solar energetic particle event. A dependence of the cosmic ray charging rate on the test-mass potential between −30.2 and −40.3 e s$^{−1}$ V$^{−1}$ was observed resulting in an equilibrium test-mass potential between 670 and 960 mV, and this is attributed to a contribution to charging from low-energy electrons emitted from the gold surfaces of the gravitational reference sensor. Data from the onboard particle detector show a reliable correlation with the charging rate and with other environmental monitors of the cosmic ray flux. This correlation is exploited to extrapolate test-mass charging rates to a 20-year period giving useful insight into the expected range of charging rate that may be observed in the LISA mission.
Published: 2023

44. Tilt-to-length coupling in LISA Pathfinder: A data analysis

Author: Jetzer, P, Audley, H, Baird, J, Binetruy, P, Born, M, Bortoluzzi, D, Castelli, E, Cavalleri, A, Cesarini, A, Cruise, A M, Danzmann, K, de Deus Silva, M, Diepholz, I, Dixon, G, Dolesi, R, Ferraioli, L, Ferroni, V, Fitzsimons, E D, Freschi, M, Gesa, L, Giardini, D, Gibert, F, Giusteri, R, Grimani, C, Grzymisch, J, Harrison, I, Hartig, M-S; https://orcid.org/0000-0002-1078-3497, Heinzel, G, Hewitson, M, Hollington, D, et al, Jetzer, P, Audley, H, Baird, J, Binetruy, P, Born, M, Bortoluzzi, D, Castelli, E, Cavalleri, A, Cesarini, A, Cruise, A M, Danzmann, K, de Deus Silva, M, Diepholz, I, Dixon, G, Dolesi, R, Ferraioli, L, Ferroni, V, Fitzsimons, E D, Freschi, M, Gesa, L, Giardini, D, Gibert, F, Giusteri, R, Grimani, C, Grzymisch, J, Harrison, I, Hartig, M-S; https://orcid.org/0000-0002-1078-3497, Heinzel, G, Hewitson, M, Hollington, D, and et al
Abstract: We present a study of the tilt-to-length coupling noise during the LISA Pathfinder mission and how it depended on the system’s alignment. Tilt-to-length coupling noise is the unwanted coupling of angular and lateral spacecraft or test mass motion into the primary interferometric displacement readout. It was one of the major noise sources in the LISA Pathfinder mission and is likewise expected to be a primary noise source in LISA. We demonstrate here that a recently derived and published analytical model describes the dependency of the LISA Pathfinder tilt-to-length coupling noise on the alignment of the two freely falling test masses. This was verified with the data taken before and after the realignments performed in March (engineering days) and June 2016, and during a two-day experiment in February 2017 (long cross-talk experiment). The latter was performed with the explicit goal of testing the tilt-to-length coupling noise dependency on the test mass alignment. Using the analytical model, we show that all realignments performed during the mission were only partially successful and explain the reasons why. In addition to the analytical model, we computed another physical tilt-to-length coupling model via a minimizing routine making use of the long cross-talk experiment data. A similar approach could prove useful for the LISA mission.
Published: 2023

45. Sensor noise in LISA Pathfinder: An extensive in-flight review of the angular and longitudinal interferometric measurement system

Author: Jetzer, P, Tiwari, S, Lopez, D, Haney, M, Ebersold, M, Boitier, A, Hamilton, E, Xu, Y, Cavalleri, A, Cesarini, A, Cruise, A M, Danzmann, K, de Deus Silva, M, Diepholz, I, Dixon, G, Dolesi, R, Ferraioli, L, Ferroni, V, Fitzsimons, E D, Flatscher, R, Freschi, M, García, A, Gerndt, R, Gesa, L, Giardini, D, Gibert, F, Giusteri, R, Grimani, C, Grzymisch, J, Guzman, F, et al, and University of Zurich
Subjects: 530 Physics, 10192 Physics Institute
Published: 2022

46. Transient acceleration events in LISA Pathfinder data: Properties and possible physical origin

Author: Jetzer, P, Tiwari, S, Lopez, D, Haney, M, Ebersold, M, Boitier, A, Hamilton, Eleanor Z, Xu, Y, Cesarini, A, Chiavegato, V, Cruise, A M, Dal Bosco, D, Danzmann, K, De Deus Silva, M, Diepholz, I, Dixon, G, Dolesi, R, Ferraioli, L, Ferroni, V, Fitzsimons, E D, Freschi, M, Gesa, L, Giardini, D, Gibert, F, Giusteri, R, Grimani, C, Grzymisch, J, Harrison, I, Hartig, M S, Heinzel, G, et al, and University of Zurich
Subjects: 530 Physics, 10192 Physics Institute, 3106 Nuclear and High Energy Physics
Published: 2022

47. Spatial dynamic metabolomics identifies metabolic cell fate trajectories in human kidney differentiation

Author: Wang, Gangqi, primary, Heijs, Bram, additional, Kostidis, Sarantos, additional, Rietjens, Rosalie G.J., additional, Koning, Marije, additional, Yuan, Lushun, additional, Tiemeier, Gesa L., additional, Mahfouz, Ahmed, additional, Dumas, Sébastien J., additional, Giera, Martin, additional, Kers, Jesper, additional, Chuva de Sousa Lopes, Susana M., additional, van den Berg, Cathelijne W., additional, van den Berg, Bernard M., additional, and Rabelink, Ton J., additional
Published: 2022
Full Text: View/download PDF

48. Sensor noise in LISA Pathfinder : An extensive in-flight review of the angular and longitudinal interferometric measurement system

Author: Armano, M., primary, Audley, H., additional, Baird, J., additional, Binetruy, P., additional, Born, M., additional, Bortoluzzi, D., additional, Brandt, N., additional, Castelli, E., additional, Cavalleri, A., additional, Cesarini, A., additional, Cruise, A. M., additional, Danzmann, K., additional, de Deus Silva, M., additional, Diepholz, I., additional, Dixon, G., additional, Dolesi, R., additional, Ferraioli, L., additional, Ferroni, V., additional, Fitzsimons, E. D., additional, Flatscher, R., additional, Freschi, M., additional, García, A., additional, Gerndt, R., additional, Gesa, L., additional, Giardini, D., additional, Gibert, F., additional, Giusteri, R., additional, Grimani, C., additional, Grzymisch, J., additional, Guzman, F., additional, Harrison, I., additional, Hartig, M-S, additional, Hechenblaikner, G., additional, Heinzel, G., additional, Hewitson, M., additional, Hollington, D., additional, Hoyland, D., additional, Hueller, M., additional, Inchauspé, H., additional, Jennrich, O., additional, Jetzer, P., additional, Johann, U., additional, Johlander, B., additional, Karnesis, N., additional, Kaune, B., additional, Killow, C. J., additional, Korsakova, N., additional, Lobo, J. A., additional, López-Zaragoza, J. P., additional, Maarschalkerweerd, R., additional, Mance, D., additional, Martín, V., additional, Martin-Polo, L., additional, Martin-Porqueras, F., additional, Martino, J., additional, McNamara, P. W., additional, Mendes, J., additional, Mendes, L., additional, Meshksar, N., additional, Monsky, A., additional, Nofrarias, M., additional, Paczkowski, S., additional, Perreur-Lloyd, M., additional, Petiteau, A., additional, Plagnol, E., additional, Ramos-Castro, J., additional, Reiche, J., additional, Rivas, F., additional, Robertson, D. I., additional, Russano, G., additional, Sanjuan, J., additional, Slutsky, J., additional, Sopuerta, C. F., additional, Steier, F., additional, Sumner, T., additional, Texier, D., additional, Thorpe, J. I., additional, Vetrugno, D., additional, Vitale, S., additional, Wand, V., additional, Wanner, G., additional, Ward, H., additional, Wass, P. J., additional, Weber, W. J., additional, Wissel, L., additional, Wittchen, A., additional, and Zweifel, P., additional
Published: 2022
Full Text: View/download PDF

49. Patterns of subsurface fluid-flow at cold seeps: The Hikurangi Margin, offshore New Zealand

Author: Krabbenhoeft, Anne, Bialas, Jörg, Klaucke, Ingo, Crutchley, Gareth, Papenberg, Cord, and Netzeband, Gesa L.
Published: 2013
Full Text: View/download PDF

50. Endothelial Glycocalyx Hyaluronan

Author: Ton J. Rabelink, Gesa L. Tiemeier, Bernard M. van den Berg, and Gangqi Wang
Subjects: 0301 basic medicine, Endothelium, Chemistry, Inflammation, Vascular permeability, 030204 cardiovascular system & hematology, Pathology and Forensic Medicine, Cell biology, Glycocalyx, Endothelial stem cell, 03 medical and health sciences, 030104 developmental biology, 0302 clinical medicine, medicine.anatomical_structure, medicine, Mechanotransduction, medicine.symptom, Receptor, Homeostasis
Abstract: The endothelial glycocalyx is critically involved in vascular integrity and homeostasis, by regulating vascular permeability, regulating mechanotransduction, and reducing inflammation and coagulation. The turnover of the glycocalyx is dynamic to fine-tune these processes. This is in particular true for its main structural component, hyaluronan (HA). Degradation and shedding of the glycocalyx by enzymes, such as hyaluronidase 1 and hyaluronidase 2, are responsible for regulation of the glycocalyx thickness and hence access of circulating cells and factors to the endothelial cell membrane and its receptors. This degradation process will at the same time also allow for resynthesis and adaptive chemical modification of the glycocalyx. The (re)synthesis of HA is dependent on the availability of its sugar substrates, thus linking glycocalyx biology directly to cellular glucose metabolism. It is therefore of particular interest to consider the consequences of dysregulated cellular glucose in diabetes for glycocalyx biology and its implications for endothelial function. This review summarizes the metabolic regulation of endothelial glycocalyx HA and its potential as a therapeutic target in diabetic vascular complications.
Published: 2020

Catalog

Books, media, physical & digital resources

See catalog results

Searchworks

Select search scope, currently: Articles Catalog books, media & more in Jio Institute collections Articles journal articles & other e-resources

Search

Search Constraints

Refine your results

Search Limiters

Topic

Publication Year Range

Language

Publication Type

Journal

Region

Database

Publisher

270 results on '"Gesa, L"'

Search Results

Catalog

Select search scope, currently: Articles

Catalog

books, media & more in Jio Institute collections

Articles

journal articles & other e-resources