6,525 results on '"Perez, S"'
Search Results
2. Studying single-electron traps in newly fabricated Skipper-CCDs for the Oscura experiment using the pocket-pumping technique
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Perez, S. E., Cervantes-Vergara, B. A., Estrada, J., Holland, S., Rodrigues, D., and Tiffenberg, J.
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Physics - Instrumentation and Detectors ,Astrophysics - Instrumentation and Methods for Astrophysics - Abstract
Understanding and characterizing very low-energy ($\sim$eV) background sources is a must in rare-event searches. Oscura, an experiment aiming to probe electron recoils from sub-GeV dark matter using a 10-kg skipper-CCD detector, has recently fabricated its first two batches of sensors. In this work, we present the characterization of defects/contaminants identified in the buried-channel region of these newly fabricated skipper-CCDs. These defects/contaminants produce deferred charge from trap emission in the images next to particle tracks, which can be spatially resolved due to the sub-electron resolution achieved with these sensors. Using the trap-pumping technique, we measured the energy and cross section associated to these traps in three Oscura prototype sensors from different fabrication batches which underwent different gettering methods during fabrication. Results suggest that the type of defects/contaminants is more closely linked to the fabrication batch rather than to the gettering method used. The exposure-dependent single-electron rate (SER) of one of these sensors was measured $\sim$100~m underground, yielding $(1.8\pm 0.3)\times10^{-3}~e^-$/pix/day at 131K. The impact of the identified traps on the measured exposure-dependent SER is evaluated via a Monte Carlo simulation. Results suggest that the exposure-dependent SER of Oscura prototype sensors would be lower in lower background environments as expected.
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- 2024
3. Astrometric and photometric characterization of $\eta$ Tel B combining two decades of observations
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Nogueira, P. H., Lazzoni, C., Zurlo, A., Bhowmik, T., Donoso-Oliva, C., Desidera, S., Milli, J., Pérez, S., Delorme, P., Fernadez, A., Langlois, M., Petrus, S., Cabrera-Vives, G., and Chauvin, G.
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Astrophysics - Solar and Stellar Astrophysics ,Astrophysics - Earth and Planetary Astrophysics - Abstract
$\eta$ Tel is an 18 Myr system with a 2.09 M$_{\odot}$ A-type star and an M7-M8 brown dwarf companion, $\eta$ Tel B, separated by 4.2'' (208 au). High-contrast imaging campaigns over 20 years have enabled orbital and photometric characterization. $\eta$ Tel B, bright and on a wide orbit, is ideal for detailed examination. We analyzed three new SPHERE/IRDIS coronagraphic observations to explore $\eta$ Tel B's orbital parameters, contrast, and surroundings, aiming to detect a circumplanetary disk or close companion. Reduced IRDIS data achieved a contrast of 1.0$\times 10^{-5}$, enabling astrometric measurements with uncertainties of 4 mas in separation and 0.2 degrees in position angle, the smallest so far. With a contrast of 6.8 magnitudes in the H band, $\eta$ Tel B's separation and position angle were measured as 4.218'' and 167.3 degrees, respectively. Orbital analysis using Orvara code, considering Gaia-Hipparcos acceleration, revealed a low eccentric orbit (e $\sim$ 0.34), inclination of 81.9 degrees, and semi-major axis of 218 au. $\eta$ Tel B's mass was determined to be 48 \MJup, consistent with previous calculations. No significant residual indicating a satellite or disk around $\eta$ Tel B was detected. Detection limits ruled out massive objects around $\eta$ Tel B with masses down to 1.6 \MJup at a separation of 33 au., Comment: 13 pages, 10 figures, accepted for publication in A&A (01/05/2024)
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- 2024
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4. Discovery of an accretion streamer and a slow wide-angle outflow around FU Orionis
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Hales, A. S., Gupta, A., Ruiz-Rodriguez, D., Williams, J. P., Perez, S., Cieza, L., Gonzalez-Ruilova, C., Pineda, J. E., Santamaria-Miranda, A., Tobin, J., Weber, P., Zhu, Z., and Zurlo, A.
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Astrophysics - Solar and Stellar Astrophysics ,Astrophysics - Astrophysics of Galaxies - Abstract
We present ALMA 12-m, 7-m & Total Power (TP) Array observations of the FU Orionis outbursting system, covering spatial scales ranging from 160 to 25,000 au. The high-resolution interferometric data reveals an elongated $^{12}$CO(2-1) feature previously observed at lower resolution in $^{12}$CO(3-2). Kinematic modeling indicates that this feature can be interpreted as an accretion streamer feeding the binary system. The mass infall rate provided by the streamer is significantly lower than the typical stellar accretion rates (even in quiescent states), suggesting that this streamer alone is not massive enough to sustain the enhanced accretion rates characteristic of the outbursting class prototype. The observed streamer may not be directly linked to the current outburst but rather a remnant of a previous, more massive streamer that may have contributed enough to the disk mass to render it unstable and trigger FU Ori's outburst. The new data detects, for the first time, a vast, slow-moving carbon monoxide molecular outflow emerging from this object. To accurately assess the outflow properties (mass, momentum, kinetic energy), we employed $^{13}$CO(2-1) data to correct for optical depth effects. The analysis indicates that the outflow corresponds to swept-up material not associated with the current outburst, similar to slow-molecular outflows observed around other FUor and Class I protostellar objects.
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- 2024
5. Polarimetric differential imaging with VLT/NACO. A comprehensive PDI pipeline for NACO data (PIPPIN)
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de Regt, S., Ginski, C., Kenworthy, M. A., Caceres, C., Garufi, A., Gledhill, T. M., Hales, A. S., Huelamo, N., Kospal, A., Millar-Blanchaer, M. A., Perez, S., and Schreiber, M. R.
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Astrophysics - Earth and Planetary Astrophysics ,Astrophysics - Instrumentation and Methods for Astrophysics ,Astrophysics - Solar and Stellar Astrophysics - Abstract
The observed diversity of exoplanets can possibly be traced back to the planet formation processes. Planet-disk interactions induce sub-structures in the circumstellar disk that can be revealed via scattered light observations. However, a high-contrast imaging technique such as polarimetric differential imaging (PDI) must first be applied to suppress the stellar diffraction halo. In this work we present the PDI PiPelIne for NACO data (PIPPIN), which reduces the archival polarimetric observations made with the NACO instrument at the Very Large Telescope. Prior to this work, such a comprehensive pipeline to reduce polarimetric NACO data did not exist. We identify a total of 243 datasets of 57 potentially young stellar objects observed before NACO's decommissioning. The PIPPIN pipeline applies various levels of instrumental polarisation correction and is capable of reducing multiple observing setups, including half-wave plate or de-rotator usage and wire-grid observations. A novel template-matching method is applied to assess the detection significance of polarised signals in the reduced data. In 22 of the 57 observed targets, we detect polarised light resulting from a scattering of circumstellar dust. The detections exhibit a collection of known sub-structures, including rings, gaps, spirals, shadows, and in- or outflows of material. Since NACO was equipped with a near-infrared wavefront sensor, it made unique polarimetric observations of a number of embedded protostars. This is the first time detections of the Class I objects Elia 2-21 and YLW 16A have been published. Alongside the outlined PIPPIN pipeline, we publish an archive of the reduced data products, thereby improving the accessibility of these data for future studies., Comment: Accepted for publication in A&A. For more information on PIPPIN, see: https://pippin-naco.readthedocs.io/en/latest . The reduced images are available on Zenodo: https://zenodo.org/doi/10.5281/zenodo.8348803
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- 2024
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6. The environment around young eruptive stars. SPHERE/IRDIS polarimetric imaging of 7 protostars
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Zurlo, A., Weber, P., Pérez, S., Cieza, L., Ginski, C., van Holstein, R. G., Principe, D., Garufi, A., Hales, A., Kastner, J., Rigliaco, E., Ruane, G., Benisty, M., and Manara, C.
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Astrophysics - Solar and Stellar Astrophysics ,Astrophysics - Earth and Planetary Astrophysics ,Astrophysics - Instrumentation and Methods for Astrophysics - Abstract
Eruptive stars are a class of young stellar objects that show an abrupt increase in their luminosity. These burst-like episodes are thought to dominate the stellar accretion process during the class 0/class I stage. We present an overview of a survey of seven episodically accreting protostars aimed at studying their potentially complex circumstellar surroundings. The observations were performed with the instrument SPHERE, mounted at the VLT. We observed the eruptive stars in $H$-band with the near-infrared imager IRDIS and used the polarimeter to extract the polarized light scattered from the stars' surroundings. We produced polarized light images for three FUor objects, Z CMa, V960 Mon, and FU Ori, and four EXor objects, XZ Tau, UZ Tau, NY Ori, and EX Lup. We calculated the intrinsic polarization fraction for all the observed stars. In all systems we registered scattered light from around the primary star. FU Ori and V960 Mon are surrounded by complex structures including spiral-like features. In Z CMa, we detected a point source 0.7 arcsec to the northeast of the primary. Based on the astrometric measurements from archival Keck/NIRC2 data, we find this source to be a third member of the system. Further, Z CMa displays an outflow extending thousands of au. Unlike the other EXor objects in our sample, XZ Tau shows bright, extended scattered light structures, also associated with an outflow on a scale of hundreds of au. The other EXors show relatively faint disk-like structures in the immediate vicinity of the coronagraph. Asymmetric arms were only found around FUor objects, while faint disks seem to predominantly occur around EXors. Importantly, for Z CMa the detection of the faint extended structure questions previous interpretations of the system's dynamic state. The streamer which was associated with a fly-by object turned out to be part of a huge outflow extending 6000 au., Comment: Accepted for publication in A&A. 14 pages, 7 figures, 2 tables
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- 2024
7. The SPHERE view of the Taurus star-forming region
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Garufi, A., Ginski, C., van Holstein, R. G., Benisty, M., Manara, C. F., Pérez, S., Pinilla, P., Ribas, Á., Weber, P., Williams, J., Cieza, L., Dominik, C., Facchini, S., Huang, J., Zurlo, A., Bae, J., Hagelberg, J., Henning, Th., Hogerheijde, M. R., Janson, M., Ménard, F., Messina, S., Meyer, M. R., Pinte, C., Quanz, S. P., Rigliaco, E., Roccatagliata, V., Schmid, H. M., Szulágyi, J., van Boekel, R., Wahhaj, Z., Antichi, J., Baruffolo, A., and Moulin, T.
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Astrophysics - Astrophysics of Galaxies ,Astrophysics - Earth and Planetary Astrophysics ,Astrophysics - Solar and Stellar Astrophysics - Abstract
The sample of planet-forming disks observed by high-contrast imaging campaigns over the last decade is mature enough to enable the demographical analysis of individual star-forming regions. We present the full census of Taurus sources with VLT/SPHERE polarimetric images available. The whole sample sums up to 43 targets (of which 31 have not been previously published) corresponding to one-fifth of the Class II population in Taurus and about half of such objects that are observable. A large fraction of the sample is apparently made up of isolated faint disks (equally divided between small and large self-shadowed disks). Ambient signal is visible in about one-third of the sample. This probes the interaction with the environment and with companions or the outflow activity of the system. The central portion of the Taurus region almost exclusively hosts faint disks, while the periphery also hosts bright disks interacting with their surroundings. The few bright disks are found around apparently older stars. The overall picture is that the Taurus region is in an early evolutionary stage of planet formation. Yet, some objects are discussed individually, as in an intermediate or exceptional stage of the disk evolution. This census provides a first benchmark for the comparison of the disk populations in different star forming regions., Comment: Accepted by A&A
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- 2024
8. Home-Based Trimodal Prehabilitation in Patients with Peritoneal Carcinomatosis Undergoing Cytoreductive Surgery: Effect on Functional Walking Capacity and Skeletal Muscle Mass
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Lario-Perez, S., Macia, J.-J., Lillo-Garcia, C., Caravaca, I., Lopez-Rodriguez, F., Calero, A., Tomas-Rodriguez, M. I., Moya-Martinez, A., Arroyo, A., and Lacueva, F.-J.
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- 2024
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9. Use of sugammadex in prevention of post-operative urinary retention in minimally invasive hernia surgery
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Tsouknidas, I., Perez, S., Kunkel, E., Tiko-Okoye, C., Buckley, M. E., and Gefen, J. Y.
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- 2024
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10. Magnetized Strange Stars and Signals of Gravitational Waves
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Pérez, S. López, Paret, D. Manreza, and Martínez, A. Pérez
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General Relativity and Quantum Cosmology ,Astrophysics - High Energy Astrophysical Phenomena - Abstract
We study the emission of gravitational waves from spheroidal magnetized strange stars for both an isolated slowly rotating star and a binary system. In the first case, we compute the quadrupole moment and the amplitude of gravitational waves that may be emitted. For the binary system, the tidal deformability is obtained by solving simultaneously the system of spheroidal structure equations and the Love number equation. These results are compared with the data inferred from the GW170817 event which is also used to calculate the mass and tidal deformability of the companion star in the binary system. Our model supports binary systems formed by magnetized strange stars describing reasonable signals of gravitational waves contrasted with other models of binary systems composed of magnetized hadronic stars and non-magnetized quark stars.
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- 2024
11. Deployment and performance of a Low-Energy-Threshold Skipper-CCD inside a nuclear reactor
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Depaoli, E., Rodrigues, D., Sidelnik, I., Bellino, P., Botti, A., Delgado, D., Cababie, M., Chierchie, F., Estrada, J., Moroni, G. Fernandez, Perez, S., and Tiffenberg, J.
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High Energy Physics - Experiment ,Astrophysics - Instrumentation and Methods for Astrophysics ,Physics - Instrumentation and Detectors - Abstract
Charge Coupled Devices (CCD) are used for reactor neutrino experiments and already shown their potential in constraining new physics models. The prospect of a Skipper-CCD experiment looking for standard and beyond standard model physics (BSM) in a nuclear reactor has been recently evaluated for different benchmark scenarios. Here we report the installation of the first 2 g Skipper-CCD inside the containment building of a 2 GW$_{th}$ nuclear power plant, positioned 12 meters from the center of the reactor core. We discuss the challenges involved in the commissioning of the detector and present data acquired during reactor ON and reactor OFF periods, with the detector operating with a sub-electron readout noise of 0.17 e-. The ongoing efforts to improve sensitivities to CEvNS and BSM interaction are also discussed., Comment: 12 pages, 7 figures, 1 table
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- 2024
12. Physics Opportunities at a Beam Dump Facility at PIP-II at Fermilab and Beyond
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Aguilar-Arevalo, A. A., Barrow, J. L., Bhat, C., Bogenschuetz, J., Bonifazi, C., Bross, A., Cervantes, B., D'Olivo, J., De Roeck, A., Dutta, B., Eads, M., Eldred, J., Estrada, J., Fava, A., Vilela, C. Fernandes, Moroni, G. Fernandez, Flaugher, B., Gardiner, S., Gurung, G., Gutierrez, P., Jang, W. Y., Kelly, K. J., Kim, D., Kobilarcik, T., Liu, Z., Lyu, K. F., Machado, P., Mahapatra, R., Marjanovic, M., Mastbaum, A., Pandey, V., Pellico, W., Perez, S., Reichenbacher, J., Rodrigues, D., Sousa, A., Simons, B., Snowden-Ifft, D., Tan, C. -Y., Toups, M., Tran, N., Tsai, Y. -T., Van de Water, R. G., Vilar, R., Westerdale, S., Yu, J., Zettlemoyer, J., and Zwaska, R.
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High Energy Physics - Experiment ,High Energy Physics - Phenomenology ,Physics - Instrumentation and Detectors - Abstract
The Fermilab Proton-Improvement-Plan-II (PIP-II) is being implemented in order to support the precision neutrino oscillation measurements at the Deep Underground Neutrino Experiment, the U.S. flagship neutrino experiment. The PIP-II LINAC is presently under construction and is expected to provide 800~MeV protons with 2~mA current. This white paper summarizes the outcome of the first workshop on May 10 through 13, 2023, to exploit this capability for new physics opportunities in the kinematic regime that are unavailable to other facilities, in particular a potential beam dump facility implemented at the end of the LINAC. Various new physics opportunities have been discussed in a wide range of kinematic regime, from eV scale to keV and MeV. We also emphasize that the timely establishment of the beam dump facility at Fermilab is essential to exploit these new physics opportunities.
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- 2023
13. Spirals and clumps in V960 Mon: signs of planet formation via gravitational instability around an FU Ori star?
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Weber, P., Pérez, S., Zurlo, A., Miley, J., Hales, A., Cieza, L., Principe, D., Cárcamo, M., Garufi, A., Kóspál, Á., Takami, M., Kastner, J., Zhu, Z., and Williams, J.
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Astrophysics - Earth and Planetary Astrophysics ,Astrophysics - Solar and Stellar Astrophysics - Abstract
The formation of giant planets has traditionally been divided into two pathways: core accretion and gravitational instability. However, in recent years, gravitational instability has become less favored, primarily due to the scarcity of observations of fragmented protoplanetary disks around young stars and low occurrence rate of massive planets on very wide orbits. In this study, we present a SPHERE/IRDIS polarized light observation of the young outbursting object V960 Mon. The image reveals a vast structure of intricately shaped scattered light with several spiral arms. This finding motivated a re-analysis of archival ALMA 1.3 mm data acquired just two years after the onset of the outburst of V960 Mon. In these data, we discover several clumps of continuum emission aligned along a spiral arm that coincides with the scattered light structure. We interpret the localized emission as fragments formed from a spiral arm under gravitational collapse. Estimating the mass of solids within these clumps to be of several Earth masses, we suggest this observation to be the first evidence of gravitational instability occurring on planetary scales. This study discusses the significance of this finding for planet formation and its potential connection with the outbursting state of V960 Mon., Comment: Published in ApJL. 11 pages, 4 figures. Images available as fits files at https://github.com/yemsnucleus/V960_Mon_ApJL
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- 2023
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14. Confirmation of the spectral excess in DAMIC at SNOLAB with skipper CCDs
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Aguilar-Arevalo, A., Arnquist, I., Avalos, N., Barak, L., Baxter, D., Bertou, X., Bloch, I. M., Botti, A. M., Cababie, M., Cancelo, G., Castelló-Mor, N., Cervantes-Vergara, B. A., Chavarria, A. E., Cortabitarte-Gutiérrez, J., Crisler, M., Cuevas-Zepeda, J., Dastgheibi-Fard, A., De Dominicis, C., Deligny, O., Drlica-Wagner, A., Duarte-Campderros, J., D'Olivo, J. C., Essig, R., Estrada, E., Estrada, J., Etzion, E., Favela-Perez, F., Gadola, N., Gaïor, R., Holland, S. E., Hossbach, T., Iddir, L., Kilminster, B., Korn, Y., Lantero-Barreda, A., Lawson, I., Lee, S., Letessier-Selvon, A., Loaiza, P., Lopez-Virto, A., Luoma, S., Marrufo-Villalpando, E., McGuire, K. J., Moroni, G. F., Munagavalasa, S., Norcini, D., Orly, A., Papadopoulos, G., Paul, S., Perez, S. E., Piers, A., Privitera, P., Robmann, P., Rodrigues, D., Saffold, N. A., Scorza, S., Settimo, M., Singal, A., Smida, R., Sofo-Haro, M., Stefanazzi, L., Stifter, K., Tiffenberg, J., Traina, M., Uemura, S., Vila, I., Vilar, R., Volansky, T., Warot, G., Yajur, R., Yu, T-T., and Zopounidis, J-P.
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Astrophysics - Cosmology and Nongalactic Astrophysics ,High Energy Physics - Experiment ,Nuclear Experiment - Abstract
We present results from a 3.25 kg-day target exposure of two silicon charge-coupled devices (CCDs), each with 24 megapixels and skipper readout, deployed in the DAMIC setup at SNOLAB. With a reduction in pixel readout noise of a factor of 10 relative to the previous detector, we investigate the excess population of low-energy events in the CCD bulk previously observed above expected backgrounds. We address the dominant systematic uncertainty of the previous analysis through a depth fiducialization designed to reject surface backgrounds on the CCDs. The measured bulk ionization spectrum confirms the presence of an excess population of low-energy events in the CCD target with characteristic rate of ${\sim}7$ events per kg-day and electron-equivalent energies of ${\sim}80~$eV, whose origin remains unknown., Comment: 8 pages, 4 figures
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- 2023
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15. ASO Visual Abstract: Home-Based Trimodal Prehabilitation in Patients with Peritoneal Carcinomatosis Undergoing Cytoreductive Surgery: Effect on Functional Walking Capacity and Skeletal Muscle Mass
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Lario-Perez, S., Macia, J. J., Lillo-Garcia, C., Caravaca, I., Lopez-Rodriguez, F., Calero, A., Tomas-Rodriguez, M. I., Moya-Martinez, A., Arroyo, A., and Lacueva, F. -J.
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- 2024
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16. The ALMA view of MP Mus (PDS 66): a protoplanetary disk with no visible gaps down to 4 au scales
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Ribas, Á., Macías, E., Weber, P., Pérez, S., Cuello, N., Dong, R., Aguayo, A., Cáceres, C., Carpenter, J., Dent, W. R. F., de Gregorio-Monsalvo, I., Duchêne, G., Espaillat, C. C., Riviere-Marichalar, P., and Villenave, M.
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Astrophysics - Earth and Planetary Astrophysics ,Astrophysics - Solar and Stellar Astrophysics - Abstract
We present ALMA multiwavelength observations of the protoplanetary disk around the nearby (d$\sim$100 pc) young solar analog MP Mus (PDS 66). These observations at 0.89 mm, 1.3 mm, and 2.2 mm have angular resolutions of $\sim$ 1", 0.05", and 0.25", respectively, and probe the dust and gas in the system with unprecedented detail and sensitivity. The disk appears smooth down to the 4 au resolution of the 1.3 mm observations, in contrast with most disks observed at comparable spatial scales. The dust disk has a radius of 60$\pm$5 au, a dust mass of $0.14_{-0.06}^{+0.11} M_{\rm Jup}$, and a mm spectral index $<2$ in the inner 30 au, suggesting optically thick emission from grains with high albedo in this region. Several molecular gas lines are also detected extending up to 130$\pm$15 au, similar to small grains traced by scattered light observations. Comparing the fluxes of different CO isotopologues with previous models yields a gas mass of $0.1-1 M_{\rm Jup}$, implying a gas to dust ratio of 1-10. We also measure a dynamical stellar mass of $M_{\rm dyn}$=1.30$\pm$0.08 $M_\odot$ and derive an age of 7-10 Myr for the system. The survival of large grains in an evolved disk without gaps/rings is surprising, and it is possible that existing substructures remain undetected due to optically thick emission at 1.3 mm. Alternatively, small structures may still remain unresolved with the current observations. Based on simple scaling relations for gap-opening planets and gap widths, this lack of substructures places upper limits to the masses of planets in the disk as low as 2 $M_\oplus$-0.06 $M_{\rm Jup}$ at $r > 40$ au. The lack of mm emission at radii $r > 60$ au also suggests that the gap in scattered light between 30-80 au is likely not a gap in the disk density, but a shadow cast by a puffed-up inner disk., Comment: 17 pages + 3 appendices. Accepted for publication in Astronomy & Astrophysics
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- 2023
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17. Evolutionary Relationships Among Prehistoric Human Populations: An Evaluation of Relatedeness Patterns Based on Facial Morphometric Data Using Molecular Data
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Perez, S. Ivan, Bernal, Valeria, and Gonzalez, Paula N
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- 2007
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18. Design and Assembly of Efficient Component-Based Off-Earth Infrastructure: From Vernacular to Contemporary Form-Finding Methods
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Konstantatou, M., Todisco, L., Borg, C., Piker, D., Perez, S. C. Navarro, Gallou, I., Schnädelbach, Holger, Editor-in-Chief, Bier, Henriette, Editor-in-Chief, Van Laerhoven, Kristof, Editor-in-Chief, Alavi, Hamed S., Editorial Board Member, Ameijde, Jeroen van, Editorial Board Member, Dirrenberger, Justin, Editorial Board Member, Gerber, David, Editorial Board Member, Green, Keith, Editorial Board Member, Fatah, Ava, Editorial Board Member, Foth, Marcus, Editorial Board Member, Khan, Omar, Editorial Board Member, Kirk, David, Editorial Board Member, Kortuem, Gerd, Editorial Board Member, Morel, Philippe, Editorial Board Member, Reinhardt, Dagmar, Editorial Board Member, Speed, Chris, Editorial Board Member, Streitz, Norbert, Editorial Board Member, Vanderdonckt, Jean, Editorial Board Member, Vehlken, Sebastian, Editorial Board Member, Wang, Charlie C L, Editorial Board Member, Wiberg, Mikael, Editorial Board Member, Mentler, Tilo, Editorial Board Member, Cervone, Angelo, editor, and Makaya, Advenit, editor
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- 2024
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19. First results from a multiplexed and massive instrument with sub-electron noise Skipper-CCDs
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Chierchie, F., Chavez, C. R., Haro, M. Sofo, Moroni, G. Fernandez, Cervantes-Vergara, B. A., Perez, S., Estrada, J., Tiffenberg, J., Uemura, S., and Botti, A.
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Physics - Instrumentation and Detectors - Abstract
We present a new instrument composed of a large number of sub-electron noise Skipper-CCDs operated with a two stage analog multiplexed readout scheme suitable for scaling to thousands of channels. New, thick, $1.35$ Mpix sensors, from a new foundry, are glued into a Multi-Chip Module (MCM) printed circuit board on a ceramic substrate which has 16 sensors each. The instrument, that can hold up-to 16 MCMs, a total of 256 Skipper-CCD sensors (called a Super-Module with $\approx 130$ grams of active mass and $346$ Mpix), is part of the R$\&$D effort of the OSCURA experiment which will have $\approx 94$ super-modules. Experimental results with $10$ MCMs and $160$ Skipper-CCDs sensors are presented in this paper. This is already the largest ever build instrument with single electron sensitivity CCDs using nondestructive readout, both, in terms of active mass and number of channels., Comment: Corrected minor typos
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- 2022
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20. Skipper-CCDs: current applications and future
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Cervantes-Vergara, B. A., Perez, S., D'Olivo, J. C., Estrada, J., Grimm, D. J., Holland, S., Sofo-Haro, M., and Wong, W.
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Astrophysics - Instrumentation and Methods for Astrophysics ,Physics - Instrumentation and Detectors - Abstract
This work briefly discusses the potential applications of the Skipper-CCD technology in astronomy and reviews its current use in dark matter and neutrino experiments. An overview of the ongoing efforts to build multi-kilogram experiments with these sensors is given, in the context of the Oscura experiment. First results from the characterization of Oscura sensors from the first 200 mm wafer-fabrication run with a new vendor are presented. The overall yield of the electron counting capability of these sensors is 71%. A noise of 0.087 e$^-$ RMS, with 1225 samples/pix, and a dark current of (0.031$\pm$0.013) e$^-$/pix/day at 140 K were measured.
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- 2022
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21. The morphology of CSCha circumbinary disk suggesting the existence of a Saturn-mass planet
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Kurtovic, N. T., Pinilla, P., Penzlin, Anna B. T., Benisty, M., Pérez, L., Ginski, C., Isella, A., Kley, W., Menard, F., Pérez, S., and Bayo, A.
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Astrophysics - Earth and Planetary Astrophysics ,Astrophysics - Solar and Stellar Astrophysics - Abstract
Planets have been detected in circumbinary orbits in several different systems, despite the additional challenges faced during their formation in such an environment. We investigate the possibility of planetary formation in the spectroscopic binary CS Cha by analyzing its circumbinary disk. The system was studied with high angular resolution ALMA observations at 0.87mm. Visibilities modeling and Keplerian fitting are used to constrain the physical properties of CS Cha, and the observations were compared to hydrodynamic simulations. Our observations are able to resolve the disk cavity in the dust continuum emission and the 12CO J:3-2 transition. We find the dust continuum disk to be azimuthally axisymmetric (less than 9% of intensity variation along the ring) and of low eccentricity (of 0.039 at the peak brightness of the ring). Under certain conditions, low eccentricities can be achieved in simulated disks without the need of a planet, however, the combination of low eccentricity and axisymmetry is consistent with the presence of a Saturn-like planet orbiting near the edge of the cavity., Comment: 18 pages, 13 figures, accepted in A&A. Watch a 3min summary by the first author in https://youtu.be/6j5ROSj2N-U
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- 2022
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22. Skipper-CCDs: Current applications and future
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Cervantes-Vergara, BA, Perez, S, D’Olivo, JC, Estrada, J, Grimm, DJ, Holland, S, Sofo-Haro, M, and Wong, W
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Nuclear and Plasma Physics ,Physical Sciences ,Solid state detectors ,Low-energy ionization detectors ,CCD ,Direct dark matter search ,Astronomical and Space Sciences ,Atomic ,Molecular ,Nuclear ,Particle and Plasma Physics ,Other Physical Sciences ,Nuclear & Particles Physics ,Nuclear and plasma physics - Abstract
This work briefly discusses the potential applications of the Skipper-CCD technology in astronomy and reviews its current use in dark matter and neutrino experiments. An overview of the ongoing efforts to build multi-kilogram experiments with these sensors is given, in the context of the Oscura experiment. First results from the characterization of Oscura sensors from the first 200 mm wafer-fabrication run with a new vendor are presented. The overall yield of the electron counting capability of these sensors is 71%. A noise of 0.087 e− RMS, with 1225 samples/pix, and a dark current of (0.031±0.013) e−/pix/day at 140 K were measured.
- Published
- 2023
23. Design and Assembly of Efficient Component-Based Off-Earth Infrastructure: From Vernacular to Contemporary Form-Finding Methods
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Konstantatou, M., primary, Todisco, L., additional, Borg, C., additional, Piker, D., additional, Perez, S. C. Navarro, additional, and Gallou, I., additional
- Published
- 2024
- Full Text
- View/download PDF
24. Late Pleistocene – Holocene Extinctions of the Terrestrial Megafauna
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Perez, S. Ivan, primary and Prates, Luciano, additional
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- 2024
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- View/download PDF
25. Effect of fibers and boron carbide on the radiation shielding properties of limestone and magnetite aggregate concrete
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Pérez, S., Tamayo, P., Rico, J., Alonso, J., and Thomas, C.
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- 2024
- Full Text
- View/download PDF
26. Influence of inputs from foreign source regions on daily profiles of Olea pollen at an urban site in the southeast of the Iberian Peninsula
- Author
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Martinez-Pérez, S., Nicolás, J.F., Galindo, N., Fernández-Sanchez, F.J., Soriano-Gomis, V., and Varea, M.
- Published
- 2024
- Full Text
- View/download PDF
27. Outcomes associated with ventilator-associated events (VAE), respiratory infections (VARI), pneumonia (VAP) and tracheobronchitis (VAT) in ventilated pediatric ICU patients: A multicentre prospective cohort study
- Author
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Abril-Molina, A., Alejandre, C., D., Arjona, Bustinza, A., Campins-Martí, M., Coca-Pérez, A., De Carlos, JC., Flores-González, JC., García-Besteiro, M., Jordán-García, I., López-Castilla, JD., Martínez-Padilla, MC., Mendizabal, M., Ortiz-Álvarez, A., Peña-López, Y., Pérez, E., Pérez, R., Pujol, M., Roca, D., Sánchez-Granados, JM., Sánchez-Pérez, S., Schüffelmann, C., Serrano-Megías, M., Slöcker-Barrio, M., Tejada, S., Rello, J., Peña-López, Yolanda, Slocker-Barrio, María, de-Carlos-Vicente, Juan-Carlos, Serrano-Megías, Marta, Jordán-García, Iolanda, and Rello, Jordi
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- 2024
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- View/download PDF
28. Dust entrainment in photoevaporative winds: Synthetic observations of transition disks
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Franz, R., Picogna, G., Ercolano, B., Casassus, S., Birnstiel, T., Rab, Ch., and Pérez, S.
- Subjects
Astrophysics - Earth and Planetary Astrophysics ,Astrophysics - Solar and Stellar Astrophysics - Abstract
X-ray- and extreme-ultraviolet- (XEUV-) driven photoevaporative winds acting on protoplanetary disks around young T-Tauri stars may strongly impact disk evolution, affecting both gas and dust distributions. We compute dust densities for the wind regions of XEUV-irradiated transition disks with gap sizes of 20 and 30 AU, and determine whether they can be observed at wavelengths $0.7 \lesssim \lambda_\mathrm{obs} [\mu\mathrm{m}] \lesssim 1.8$ in scattered and polarised light with current instrumentation. For an XEUV-driven outflow around a $M_* = 0.7 \mathrm{M}_\odot$ T-Tauri star with $L_X = 2 \cdot 10^{30} \mathrm{erg/s}$, we find dust mass-loss rates $\dot{M}_\mathrm{dust} \lesssim 2.0 \cdot 10^{-3} \dot{M}_\mathrm{gas}$, and if we invoke vertical settling, the outflow is quite collimated. The synthesised images exhibit a distinct chimney-like structure. The relative intensity of these chimneys is low, but under optimal conditions, their detection may still be feasible with current instrumentation such as JWST NIRCam and SPHERE IRDIS., Comment: Accepted for publication in A&A. 20+10 pages, 17+12 figures (References updated, minor adjustments.)
- Published
- 2022
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- View/download PDF
29. The protoplanetary disc around HD 169142: circumstellar or circumbinary?
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Poblete, P. P., Cuello, N., Pérez, S., Marino, S., Calcino, J., Macías, E., Ribas, Á., Zurlo, A., Cuadra, J., Montesinos, M., Zúñiga-Fernández, S., Bayo, A., Pinte, C., Ménard, F., and Price, D. J.
- Subjects
Astrophysics - Earth and Planetary Astrophysics ,Astrophysics - Solar and Stellar Astrophysics - Abstract
Stellar binaries represent a substantial fraction of stellar systems, especially among young stellar objects. Accordingly, binaries play an important role in setting the architecture of a large number of protoplanetary discs. Binaries in coplanar and polar orientations with respect to the circumbinary disc are stable configurations and could induce non-axisymmetric structures in the dust and gas distributions. In this work, we suggest that the structures shown in the central region of the protoplanetary disc HD 169142 are produced by the presence of an inner stellar binary and a circumbinary (P-type) planet. We find that a companion with a mass-ratio of 0.1, semi-major axis of 9.9 au, eccentricity of 0.2, and inclination of 90{\deg}, together with a 2 Jupiter Mass coplanar planet on a circular orbit at 45 au reproduce the structures at the innermost ring observed at 1.3 mm and the shape of spiral features in scattered light observations. The model predicts changes in the disc's dust structure, and star's astrometric parameters, which would allow testing its veracity by monitoring this system over the next 20 years., Comment: 11 pages, 7 figures, accepted for publication in MNRAS
- Published
- 2021
- Full Text
- View/download PDF
30. Análisis de Procrustes y el estudio de la variación morfológica
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Torcida, Sebastián and Perez, S. Ivan
- Subjects
Antropología ,Anthropology ,GN1-890 ,Physical anthropology. Somatology ,GN49-298 - Abstract
El estudio de la variación morfológica ha ocupado un lugar central en la antropología, así como en el resto de las ciencias naturales, a partir de su surgimiento en el siglo XVIII. Desde un punto de vista cuantitativo, el estudio de la variación morfológica busca obtener información acerca del tamaño y la forma de una estructura. Tradicionalmente, estas propiedades han sido estudiadas a través de variables lineales tales como “ancho”, “longitud”, “altura” y empleando métodos estadísticos multivariados. En las décadas del 1980 y 1990 las técnicas cuantitativas de análisis de la variación morfológica fueron revolucionadas por el desarrollo y la aplicación de un método para estudiar coordenadas cartesianas de puntos anatómicos: el Análisis de Procrustes. Desde entonces, este método ha ganado relevancia en el campo de la antropología biológica. El objetivo de este artículo es revisar los principios del Análisis de Procrustes aplicado a coordenadas de puntos anatómicos y discutir el empleo de diferentes versiones del mismo en bioantropología. El texto está ordenado como sigue: en primer lugar revisamos diversas nociones básicas involucradas en los estudios morfométricos; entre ellos, los conceptos de tamaño y forma. En segundo lugar discutimos los principios del Análisis de Procrustes y señalamos las diferencias entre sus dos versiones más importantes: la superposición por cuadrados mínimos y la superposición robusta por medianas repetidas. Finalmente, mostramos y discutimos algunos ejemplos de la aplicación de estos métodos en el campo de la antropología biológica.
- Published
- 2012
31. Dust entrainment in photoevaporative winds: Densities and imaging
- Author
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Franz, R., Ercolano, B., Casassus, S., Picogna, G., Birnstiel, T., Pérez, S., Rab, Ch., and Sharma, A.
- Subjects
Astrophysics - Earth and Planetary Astrophysics ,Astrophysics - Solar and Stellar Astrophysics - Abstract
X-ray- and EUV- (XEUV-) driven photoevaporative winds acting on protoplanetary disks around young T-Tauri stars may crucially impact disk evolution, affecting both gas and dust distributions. We constrain the dust densities in a typical XEUV-driven outflow, and determine whether these winds can be observed at $\mu\mathrm{m}$-wavelengths in scattered and polarised light. For an XEUV-driven outflow around a $M_* = 0.7\,\mathrm{M}_\odot$ T-Tauri star with $L_X = 2 \cdot 10^{30}\,\mathrm{erg/s}$, we find a dust mass-loss rate $\dot{M}_\mathrm{dust} \lesssim 4.1 \cdot 10^{-11}\,\mathrm{M_\odot / yr}$ for an optimistic estimate of dust densities in the wind (compared to $\dot{M}_\mathrm{gas} \approx 3.7 \cdot 10^{-8}\,\mathrm{M_\odot / yr}$). The synthesised scattered-light images suggest a distinct chimney structure emerging at intensities $I/I_{\max} < 10^{-4.5}$ ($10^{-3.5}$) at $\lambda_\mathrm{obs} = 1.6$ ($0.4$) $\mu\mathrm{m}$, while the features in the polarised-light images are even fainter. Observations synthesised from our model do not exhibit clear features for SPHERE IRDIS, but show a faint wind signature for JWST NIRCam under optimal conditions. In conclusion, unambiguous detections of photoevaporative XEUV winds launched from primordial disks are at least challenging with current instrumentation; this provides a possible explanation as to why disk winds are not routinely detected in scattered or polarised light., Comment: Accepted for publication in A&A. 15 pages, 11 figures. (Affiliations updated, one reference corrected.)
- Published
- 2021
- Full Text
- View/download PDF
32. Dust events characterization from visibility, trends and Dust Adversity Index in the Canary Islands for the period 1980–2022
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Suárez-Molina, D., Cuevas, E., Alonso-Pérez, S., Cana, L., Montero, G., and Oliver, A.
- Published
- 2024
- Full Text
- View/download PDF
33. Optimism as a key factor in coping with the common cold
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Puig-Perez, S., Kozusznik, M.W., and Pulopulos, M.M.
- Published
- 2024
- Full Text
- View/download PDF
34. Long-term storage and fuel quality of residual Eucalyptus globulus biomass
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Pérez, S., Fernández, I., Ortiz, F., and Ortiz, A.
- Published
- 2024
- Full Text
- View/download PDF
35. Current and prehistoric human mobility in North Neuquén: an approach using complex networks and stable isotopic mixing models
- Author
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D’Abramo, Sergio L., Perez, S. Ivan, Gonzalez, Paula N., Gobbo, Diego, Moscardi, Bruno F., and Bernal, Valeria
- Published
- 2023
- Full Text
- View/download PDF
36. Prostatitis: A Review
- Author
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Yebes, A., Toribio-Vazquez, C., Martinez-Perez, S., Quesada-Olarte, J. M., Rodriguez-Serrano, A., Álvarez-Maestro, M., and Martinez-Piñeiro, L.
- Published
- 2023
- Full Text
- View/download PDF
37. Effect of substrate microstructure on corrosion resistance of cast and forged anodised 6082 Al alloy
- Author
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Díaz, B., Figueroa, R., Nóvoa, X.R., Pérez, C., Pérez-Betanzos, S., and Valverde-Pérez, S.
- Published
- 2024
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- View/download PDF
38. On the preparation of multifunctional conversion coatings of FePO4/LiFePO4
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Valverde-Pérez, S., Figueroa, R., Nóvoa, X.R., Ramírez-Rico, D.S., and Vivier, V.
- Published
- 2024
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- View/download PDF
39. A faint companion around CrA-9: protoplanet or obscured binary?
- Author
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Christiaens, V., Ubeira-Gabellini, M. -G., Cánovas, H., Delorme, P., Pairet, B., Absil, O., Casassus, S., Girard, J. H., Zurlo, A., Aoyama, Y., Marleau, G-D., Spina, L., van der Marel, N., Cieza, L., Lodato, G., Pérez, S., Pinte, C., Price, D. J., and Reggiani, M.
- Subjects
Astrophysics - Earth and Planetary Astrophysics ,Astrophysics - Solar and Stellar Astrophysics - Abstract
Understanding how giant planets form requires observational input from directly imaged protoplanets. We used VLT/NACO and VLT/SPHERE to search for companions in the transition disc of 2MASS J19005804-3645048 (hereafter CrA-9), an accreting M0.75 dwarf with an estimated age of 1-2 Myr. We found a faint point source at $\sim$0.7'' separation from CrA-9 ($\sim$108 au projected separation). Our 3-epoch astrometry rejects a fixed background star with a $5\sigma$ significance. The near-IR absolute magnitudes of the object point towards a planetary-mass companion. However, our analysis of the 1.0-3.8$\mu$m spectrum extracted for the companion suggests it is a young M5.5 dwarf, based on both the 1.13-$\mu$m Na index and comparison with templates of the Montreal Spectral Library. The observed spectrum is best reproduced with high effective temperature ($3057^{+119}_{-36}$K) BT-DUSTY and BT-SETTL models, but the corresponding photometric radius required to match the measured flux is only $0.60^{+0.01}_{-0.04}$ Jovian radius. We discuss possible explanations to reconcile our measurements, including an M-dwarf companion obscured by an edge-on circum-secondary disc or the shock-heated part of the photosphere of an accreting protoplanet. Follow-up observations covering a larger wavelength range and/or at finer spectral resolution are required to discriminate these two scenarios., Comment: 24 pages, 14 figures, 4 tables, to be published in MNRAS
- Published
- 2021
- Full Text
- View/download PDF
40. Limits on the presence of planets in systems with debris disks: HD 92945 and HD 107146
- Author
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Mesa, D., Marino, S., Bonavita, M., Lazzoni, C., Fontanive, C., Perez, S., D'Orazi, V., Desidera, S., Gratton, R., Engler, N., Henning, T., Janson, M., Kral, Q., Langlois, M., Messina, S., Milli, J., Pawellek, N., Perrot, C., Rigliaco, E., Rickman, E., Squicciarini, V., Vigan, A., Wahhaj, Z., Zurlo, A., Boccaletti, A., Bonnefoy, M., Chauvin, G., De Caprio, V., Feldt, M., Gluck, L., Hagelberg, J., Keppler, M., Lagrange, A. -M., Launhardt, R., Maire, A. -L., Meyer, M., Moeller-Nilsson, O., Pavlov, A., Samland, M., Schmidt, T., and Weber, L.
- Subjects
Astrophysics - Earth and Planetary Astrophysics ,Astrophysics - Solar and Stellar Astrophysics - Abstract
Recent observations of resolved cold debris disks at tens of au have revealed that gaps could be a common feature in these Kuiper belt analogues. Such gaps could be evidence for the presence of planets within the gaps or closer-in near the edges of the disk. We present SPHERE observations of HD 92945 and HD 107146, two systems with detected gaps. We constrained the mass of possible companions responsible for the gap to 1-2 M Jup for planets located inside the gap and to less than 5 M Jup for separations down to 20 au from the host star. These limits allow us to exclude some of the possible configurations of the planetary systems proposed to explain the shape of the disks around these two stars. In order to put tighter limits on the mass at very short separations from the star, where direct imaging data are less effective, we also combined our data with astrometric measurements from Hipparcos and Gaia and radial velocity measurements. We were able to limit the separation and the mass of the companion potentially responsible for the proper motion anomaly of HD 107146 to values of 2-7 au and 2-5 M Jup , respectively., Comment: 17 pages, 14 Figures, accepted for publication on MNRAS
- Published
- 2021
- Full Text
- View/download PDF
41. Compliance Evaluation of WTG and WPP Controllers for Self and Black Start Operation
- Author
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Martínez-Turégano, J., Anó~-Villalba, S., Bernal-Perez, S., Blasco-Gimenez, R., Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Jiming, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Hirche, Sandra, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Li, Yong, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Möller, Sebastian, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Oneto, Luca, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zamboni, Walter, Series Editor, Zhang, Junjie James, Series Editor, Pierfederici, Serge, editor, and Martin, Jean-Philippe, editor
- Published
- 2023
- Full Text
- View/download PDF
42. Rattrapage des séquelles esthétiques de réduction mammaire par la technique du lipomodelage
- Author
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Nachaoui, H., Delay, A., Frobert, P., Vaucher, R., Perez, S., and Delay, E.
- Published
- 2024
- Full Text
- View/download PDF
43. Insights into the planetary dynamics of HD 206893 with ALMA
- Author
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Marino, S., Zurlo, A., Faramaz, V., Milli, J., Henning, Th., Kennedy, G. M., Matrà, L., Pérez, S., Delorme, P., Cieza, L. A., and Hughes, A. M.
- Subjects
Astrophysics - Earth and Planetary Astrophysics - Abstract
Radial substructure in the form of rings and gaps has been shown to be ubiquitous among protoplanetary discs. This could be the case in exoKuiper belts as well, and evidence for this is emerging. In this paper we present ALMA observations of the debris/planetesimal disc surrounding HD 206893, a system that also hosts two massive companions at 2 and 11 au. Our observations reveal a disc extending from 30 to 180 au, split by a 27 au wide gap centred at 74 au, and no dust surrounding the reddened brown dwarf (BD) at 11 au. The gap width suggests the presence of a 0.9 M$_\mathrm{Jup}$ planet at 74 au, which would be the third companion in this system. Using previous astrometry of the BD, combined with our derived disc orientation as a prior, we were able to better constrain its orbit finding it is likely eccentric ($0.14^{+0.05}_{-0.04}$). For the innermost companion, we used RV, proper motion anomaly and stability considerations to show its mass and semi-major axis are likely in the range 4-100 M$_\mathrm{Jup}$ and 1.4-4.5 au. These three companions will interact on secular timescales and perturb the orbits of planetesimals, stirring the disc and potentially truncating it to its current extent via secular resonances. Finally, the presence of a gap in this system adds to the growing evidence that gaps could be common in wide exoKuiper belts. Out of 6 wide debris discs observed with ALMA with enough resolution, 4-5 show radial substructure in the form of gaps.
- Published
- 2020
- Full Text
- View/download PDF
44. Quantum creation of a universe-antiuniverse pair
- Author
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Robles-Perez, S. J.
- Subjects
General Relativity and Quantum Cosmology ,High Energy Physics - Theory ,Quantum Physics - Abstract
If one analyses the quantum creation of the universe, it turns out that the most natural way in which the universes can be created is in pairs of universes whose time flow is reversely related. It means that the matter that propagates in one of the universes can be seen, from the point of view of the other universe, as antimatter, and viceversa. They thus form a universe-antiuniverse pair. From a global point of view, i.e. from the point of view of the whole multiverse ensemble, the creation of universes in universe-antiuniverse pairs restores the matter-antimatter asymmetry observed in each individual universe and it might provide us with distinguishable imprints of the whole multiverse proposal., Comment: 7 pages, 3 figures, prepared for the proceedings of the POTOR-6 Conference of the Polish Society on Relativity, held in Szczecin (Poland) from 23-26th of Sept. 2019
- Published
- 2020
45. Physics Opportunities at a Beam Dump Facility at PIP-II at Fermilab and Beyond
- Author
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Aguilar-Arevalo, A., primary, Barrow, J., additional, Bhat, C., additional, Bogenschuetz, J., additional, Bonifazi, C., additional, Bross, A., additional, Cervantes, B., additional, D'Olivo, J., additional, De Roeck, A., additional, Dutta, B., additional, Eads, M., additional, Eldred, J., additional, Estrada, J., additional, Fava, A., additional, Vilela, C., additional, Fernandez Moroni, G., additional, Flaugher, B., additional, Gardiner, S., additional, Gurung, G., additional, Gutierrez, P., additional, Jang, W., additional, Kelly, K., additional, Kim, D., additional, Kobilarcik, T., additional, Liu, Z., additional, Lyu, K., additional, Machado, P., additional, Mahapatra, R., additional, Marjanovic, M., additional, Mastbaum, A., additional, Pandey, V., additional, Pellico, W., additional, Perez, S., additional, Reichenbacher, J., additional, Rodrigues, D., additional, Sousa, A., additional, Simons, B., additional, Snowden-Ifft, D., additional, Tan, C.-Y., additional, Toups, M., additional, Tran, N., additional, Tsai, Y.-T., additional, Van de Water, R., additional, Vilar, R., additional, Westerdale, S., additional, Yu, J., additional, Zettlemoyer, J., additional, and Zwaska, R., additional
- Published
- 2023
- Full Text
- View/download PDF
46. The widest H$\alpha$ survey of accreting protoplanets around nearby transition disks
- Author
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Zurlo, A., Cugno, G., Montesinos, M., Canovas, H., Casassus, S., Christiaens, V., Cieza, L., Huelamo, N., and Perez, S.
- Subjects
Astrophysics - Earth and Planetary Astrophysics ,Astrophysics - Instrumentation and Methods for Astrophysics ,Astrophysics - Solar and Stellar Astrophysics - Abstract
The mechanisms of planet formation are still under debate. We know little about how planets form, even if more than 4000 exoplanets have been detected to date. Recent investigations target the cot of newly born planets: the protoplanetary disk. At the first stages of their life, exoplanets still accrete material from the gas-rich disk in which they are embedded. Transitional disks are indeed disks that show peculiarities, such as gaps, spiral arms, and rings, which can be connected to the presence of substellar companions. To investigate what is responsible for these features, we selected all the known transitional disks in the solar neighborhood (<200 pc) that are visible from the southern hemisphere. We conducted a survey of 11 transitional disks (TDs) with the SPHERE instrument at the VLT. This is the largest Halpha survey that has been conducted so far to look for protoplanets. The observations were performed with the Halpha filter of ZIMPOL in order to target protoplanets that are still in the accretion stage. All the selected targets are very young stars, less than 20 Myr, and show low extinction in the visible. We reduced the ZIMPOL pupil stabilized data by applying the method of the angular spectral differential imaging (ASDI), which combines both techniques. The datacubes are composed of the CntHalpha and the narrow band filter Halpha, which are taken simultaneously to permit the suppression of the speckle pattern. The principal component analysis (PCA) method was employed for the reduction of the data. For each dataset, we derived the 5sigma contrast limit and converted it in upper limits on the accretion luminosity. We do not detect any new accreting substellar companions around the targeted transition disks down to an average contrast of 12 magnitudes at 0.2 arcsec from the central star (continues in the manuscript)., Comment: Accepted for publication in A&A. 10 pages, 16 figures
- Published
- 2019
- Full Text
- View/download PDF
47. Modeling anisotropic magnetized strange quark stars
- Author
-
Pérez, S. López, Paret, D. Manreza, Angulo, G. Quintero, Martínez, A. Pérez, and Terrero, D. Alvear
- Subjects
General Relativity and Quantum Cosmology ,Nuclear Theory - Abstract
Compact objects have an intrinsic anisotropy due to the presence of strong magnetic fields that cause considerable modifications on the equations of state (EoS). In this work, we study the impact of this anisotropy in the size and shape of magnetized strange quark stars using an axially symmetric metric in spherical coordinates, the gamma-metric. The results are compared with those obtained with the standard Tolman-Oppenheimer-Volkoff (TOV) equations for the parallel and perpendicular pressures independently. Differences in the results are discussed., Comment: 5 pages, 5 figures, Proceedings of STARS-SMFNS 2019
- Published
- 2019
- Full Text
- View/download PDF
48. [Artículo traducido] Manejo de metástasis sintomáticas de columna: un enfoque multidisciplinario basado en un diagrama de flujo
- Author
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Pipola, V., Pasini, S., Ghermandi, R., Girolami, M., Falzetti, L., Pérez, S., Bas, T., and Gasbarrini, A.
- Published
- 2023
- Full Text
- View/download PDF
49. Management of symptomatic spine metastases: A multidisciplinary approach based flow-chart
- Author
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Pipola, V., Pasini, S., Ghermandi, R., Girolami, M., Falzetti, L., Pérez, S., Bas, T., and Gasbarrini, A.
- Published
- 2023
- Full Text
- View/download PDF
50. Adult T-cell leukemia/lymphoma in HTLV-1 non-endemic regions
- Author
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Calderón, E., Rodríguez-Iglesias, M., Montiel, N., Trujillo, T., Viciana, I., Cabezas, T., Lozano, A., Fernández-Fuertes, E., Fernández, J.M., García, F., Benito, R., Algarate, S., Ducons, M., Roc, L., Cifuentes, C., Fernández-Baca, V., Fernández-Montero, J.V, Maciá, MD., Hernández-Betancor, A., Martín, A.M., Pena, M.J., Hernández, M., López-Lirola, A.M., Gómez-Sirvent, J.L., Copado, R., Cano, M.E., Rojo, S., Eirós, J.M., Rodríguez, M., Gómez-Hernando, C., González-Praetorius, A., Rando, A., Force, L., Miró, E., Cebollero, A., Delgado, J.F., Rodríguez, G., Fernández-Pereira, L., Aguilera, A., Pereira, S., García, J., Trigo, M., Diz, J., García-Campello, M., Cortizo, S., Pérez, S., Morano, L., Reina, G., Arazamendi, M., Salicio, Y., Ugalde, E., Nieto, M.C., Liendo, P., Goikoetxea, A.J., Ocete, M.D., Ramos, J.M., Escribano, I., Sauleda, S., Pirón, M., González, R., Richart, A., Barea, L., Jiménez, A., Blanco, L., Navarro, L., Ayerdi, O., Baza, B., Rodriguez, C., del Romero, J., Galar, A., Aldamiz, T., Valeiro, M., Pérez, L., Rodríguez-Avial, I., Martín-Carbonero, L., Fernández-Ruiz, M., Parra, P., Redondo, N., Ruiz-Merlo, T., Pozuelo, M.J., Barreiro, P., Treviño, A., Corral, O., Soriano, V., Pintos, I., Moreno-Torres, V., Carrizo, P., Huertas, A., Vargas-Núñez, J.A., de Mendoza, C., de Mendoza, Carmen, Rando, Ariadna, Miró, Elisenda, Pena, María José, Rodríguez-Avial, Iciar, Ortega, Diego, González-Praetorius, Alejandro, Reina, Gabriel, Pintos, Ilduara, Pozuelo, María José, and Soriano, Vicente
- Published
- 2023
- Full Text
- View/download PDF
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