Search

Your search keyword '"Accolla M"' showing total 71 results
Start Over Author "Accolla M" Search Limiters Full Text
71 results on '"Accolla M"'

2. Quantum tunneling of oxygen atoms on very cold surfaces

Author

Minissale, M., Congiu, E., Baouche, S., Chaabouni, H., Moudens, A., Dulieu, F., Accolla, M., Cazaux, S., Manico, G., and Pirronello, V.

Subjects
Condensed Matter - Materials Science, Astrophysics - Cosmology and Extragalactic Astrophysics, Physics - Chemical Physics, 85
Abstract

Any evolving system can change of state via thermal mechanisms (hopping a barrier) or via quantum tunneling. Most of the time, efficient classical mechanisms dominate at high temperatures. This is why an increase of the temperature can initiate the chemistry. We present here an experimental investigation of O-atom diffusion and reactivity on water ice. We explore the 6-25 K temperature range at sub-monolayer surface coverages. We derive the diffusion temperature law and observe the transition from quantum to classical diffusion. Despite of the high mass of O, quantum tunneling is efficient even at 6 K. As a consequence, the solid-state astrochemistry of cold regions should be reconsidered and should include the possibility of forming larger organic molecules than previously expected., Comment: 13 pages, 4 figures

Published
2014
Full Text
View/download PDF

3. Gas temperature dependent sticking of hydrogen on cold amorphous water ice surfaces of interstellar interest

Author

Matar, E., Bergeron, H., Dulieu, F., Chaabouni, H., Accolla, M., and Lemaire, J. L.

Subjects
Physics - Chemical Physics
Abstract

Using the King & Wells method, we present experimental data on the dependence of the sticking of molecular hydrogen and deuterium on the beam temperature onto non- porous amorphous solid water (ASW) ice surfaces of interstellar interest. A statistical model that explains the isotopic effect and the beam temperature behavior of our data is proposed. This model gives an understanding of the discrepancy between all known experimental results on the sticking of molecular hydrogen. Moreover it is able to fit the theoretical results of V. Buch et al. [Astrophys. J. (1991), 379, 647] on atomic hydrogen and deuterium. For astrophysical applications, an analytical formula for the sticking coefficients of H, D, H2, D2 and HD in the case of a gas phase at thermal equilibrium is also provided at the end of the article.

Published
2010
Full Text
View/download PDF

4. Experimental evidence for water formation via ozone hydrogenation on dust grains at 10 K

Author

Mokrane, H., Chaabouni, H., Accolla, M., Congiu, E., Dulieu, F., Chehrouri, M., and Lemaire, J. L.

Subjects
Astrophysics - Astrophysics of Galaxies
Abstract

The formation of water molecules from the reaction between ozone (O3) and D-atoms is studied experimentally for the first time. Ozone is deposited on non-porous amorphous solid water ice (H2O), and D-atoms are then sent onto the sample held at 10 K. HDO molecules are detected during the desorption of the whole substrate where isotope mixing takes place, indicating that water synthesis has occurred. The efficiency of water formation via hydrogenation of ozone is of the same order of magnitude of that found for reactions involving O atoms or O2 molecules and exhibits no apparent activation barrier. These experiments validate the assumption made by models using ozone as one of the precursors of water formation via solid-state chemistry on interstellar dust grains., Comment: 16 pages, 2 figures, to be published on ApJL

Published
2009
Full Text
View/download PDF

9. Prevalence of non-aromatic carbonaceous molecules in the inner regions of circumstellar envelopes

Author

Martínez L., Santoro G., Merino P., Accolla M., Lauwaet K., Sobrado J., Sabbah H., Pelaez R.J., Herrero V.J., Tanarro I., Agúndez M., Martín-Jimenez A., Otero R., Ellis G.J., Joblin C., Cernicharo J., Martín-Gago J.A. and We thank the European Research Council for funding support under Synergy Grant ERC-2013-SyG, G.A. 610256 (NANOCOSMOS). We also acknowledge partial support from the Spanish Research Agency (AEI) through grants MAT2017-85089-c2-1R, FIS2016-77578-R and FIS2016-77726-C3-1-P. Support from the FotoArt-CM Project (P2018/NMT-4367) through the Program of R&D activities between research groups in Technologies 2013, cofinanced by European Structural Funds, is also recognized.

Published
2020

10. INFRA-ICE: An ultra-high vacuum experimental station for laboratory astrochemistry

Author

Santoro G., Sobrado J.M., Tajuelo-Castilla G., Accolla M., Martínez L., Azpeitia J., Lauwaet K., Cernicharo J., Ellis G.J., Martín-Gago J.Á. and We thank the European Research Council for funding support under Synergy Grant No. ERC-2013-SyG, G.A. 610256 (NANOCOSMOS). In addition, partial support from the Spanish Research Agency (AEI) through Grant Nos. MAT2017-85089-c2-1R and FIS2016-77578-R is acknowledged. Support from the FotoArt-CM Project (No. P2018/NMT 4367) through the Program of R&D activities between research groups in Technologies 2013, co-financed by European Structural Funds, is also acknowledged. G.T.-C. acknowledges funding from the Comunidad Autónoma de Madrid (Grant No. PEJD-2018-PRE/IND-9029). G.S. and G.J.E. would like to thank Stephane Lefrançois for valuable discussions on the mechanical details of the optical coupling.

Published
2020

12. The Chemistry of Cosmic Dust Analogs from C, C2, and C2H2 in C-rich Circumstellar Envelopes

Author

Santoro G., Martínez L., Lauwaet K., Accolla M., Tajuelo-Castilla G., Merino P., Sobrado J.M., Peláez R.J., Herrero V.J., Tanarro I., Mayoral A., Agúndez M., Sabbah H., Joblin C., Cernicharo J., Martín-Gago J.A., Santoro G., Martínez L., Lauwaet K., Accolla M., Tajuelo-Castilla G., Merino P., Sobrado J.M., Peláez R.J., Herrero V.J., Tanarro I., Mayoral A., Agúndez M., Sabbah H., Joblin C., Cernicharo J., and Martín-Gago J.A.

Published
2020

13. Prevalence of non-aromatic carbonaceous molecules in the inner regions of circumstellar envelopes

Author

Martínez L., Santoro G., Merino P., Accolla M., Lauwaet K., Sobrado J., Sabbah H., Pelaez R.J., Herrero V.J., Tanarro I., Agúndez M., Martín-Jimenez A., Otero, Roberto, Ellis G.J., Joblin C., Cernicharo J., Martín-Gago J.A., Martínez L., Santoro G., Merino P., Accolla M., Lauwaet K., Sobrado J., Sabbah H., Pelaez R.J., Herrero V.J., Tanarro I., Agúndez M., Martín-Jimenez A., Otero, Roberto, Ellis G.J., Joblin C., Cernicharo J., and Martín-Gago J.A.

Published
2020

14. Electrical properties of Itokawa grains returned by Hayabusa

Author

Cipriani, F., Drozdovski, N., Koschny, D., Colangeli, L., Ferrari, M., Della Corte, V., Accolla, M., Butler, B., Rotundi, A., Shortt, B., Sanders, S., C.v.d. Luijt, D., and Breeveld, D.

Abstract

第8回極域科学シンポジウム/個別セッション：[OA] 南極隕石 / はやぶさ12月5日（火）国語研究所 2階講堂The Eighth Symposium on Polar Science/Ordinary sessions: [OA] Antarctic meteorites / HayabusaTue. 5 Dec./2F Auditorium, National Institute for Japanese Language and Linguistics

Published
2017

16. GIADA performance during Rosetta mission scientific operations at comet 67P

Author

Agenzia Spaziale Italiana, Sordini, R., Della Corte, V., Rotundi, A., Rotunno, S., Ferrari, M., Ivanovski, S.L., Colangeli, L., Palumbo, P., López-Moreno, José Juan, Rodríguez Gómez, Julio, Fulle, M., Green, S. F., Mazzotta-Epifani, E., Morales, Rafael, Accolla, M., Palomba, E., Cosi, M., Herranz, Miguel, Liuzzi, V., Agenzia Spaziale Italiana, Sordini, R., Della Corte, V., Rotundi, A., Rotunno, S., Ferrari, M., Ivanovski, S.L., Colangeli, L., Palumbo, P., López-Moreno, José Juan, Rodríguez Gómez, Julio, Fulle, M., Green, S. F., Mazzotta-Epifani, E., Morales, Rafael, Accolla, M., Palomba, E., Cosi, M., Herranz, Miguel, and Liuzzi, V.

Abstract

The Grain Impact Analyser and Dust Accumulator (GIADA) instrument onboard Rosetta studied the dust environment of comet 67P/Churyumov–Gerasimenko from 3.7 au inbound, through perihelion, to 3.8 au outbound, measuring the dust flow and the dynamic properties of individual particles. GIADA is composed of three subsystems: (1) Grain Detection System (GDS); (2) Impact Sensor (IS); and (3) Micro-Balances System (MBS). Monitoring the subsystems’ performance during operations is an important element for the correct calibration of scientific measurements. In this paper, we analyse the GIADA inflight calibration data obtained by internal calibration devices for the three subsystems during the period from 1 August 2014 to 31 October 2015. The calibration data testify a nominal behaviour of the instrument during these fifteen months of mission; the only exception is a minor loss of sensitivity for one of the two GDS receivers, attributed to dust contamination.© 2017 COSPAR

Published
2018

17. Electrical properties of Itokawa grains returned by the Hayabusa mission

Author

Cipriani, F., Drozdovski, N., Koschny, D., Ferrari, M., Della Corte, V., Accolla, M., Butler, B., Rotundi, A., Sanders, S., Luijt, C.v.d., and Duvet, L.

Abstract

第7回極域科学シンポジウム:[OA] 南極隕石/はやぶさ11月29日（火）国立極地研究所 1階交流アトリウム

Published
2016

18. Improvements in the calibration of GIADA's measurement subsystems

Author

Sordini, R., Della Corte, V., Rotundi, A., Accolla, M., Marco Ferrari, Ivanovski, S., Lucarelli, F., Mazzotta Epifani, E., Palumbo, P., and ITA

Abstract

The Grain Impact Analyzer and Dust Accumulator (GIADA) is an in-situ instrument devoted to measure the dynamical properties of the dust grains emitted by the comet. Using the GIADA Proto Flight Model (PFM), installed in a clean room in our laboratory, an extended calibration activity \citep{Sordini14} has been carried out taking into account the knowledge gained through the analyses of IDPs and cometary samples returned from comet 81P/Wild 2 \citep{Brownlee et al. 2006, Rotundi et al. 2014}. GIADA consists of three measurement subsystems: the Grain Detection System, an optical device measuring the optical cross-section of single grain without affecting its dynamical properties; the Impact Sensor that measures the momentum released from each grain that impacts its sensitive surface, and the Micro Balance System, a network of five Quartz Micro Balances measuring the cumulative dust deposition from different space directions \citep{DellaCorte14}. The results of the analyses on data acquired with the GIADA PFM and the comparison with calibration data acquired during the pre-launch campaign allowed us to improve GIADA performances and capabilities. We report the results of the following main activities: - definition of a correlation between the two GIADA Models, i.e. PFM and In-Flight Model on-board Rosetta; - characterization of the sub-systems performances (signal elaboration, sensitivities, space environment effects); - new calibration measurements and related curves by means of the GIADA PFM using realistic cometary dust analogues \citep{Ferrari14}. All the analyses performed during this extended calibration activity are allowing to fully characterize the dynamic parameters of the dust particles ejected by the comet 67P/Churyumov-Gerasimenko \citep{Rotundi et al. 2015, Fulle et al. 2015, Della Corte et al. 2015}.

Published
2016

19. The dust-to-ices ratio in comets and Kuiper belt objects

Author

Fulle, M., primary, Della Corte, V., additional, Rotundi, A., additional, Green, S. F., additional, Accolla, M., additional, Colangeli, L., additional, Ferrari, M., additional, Ivanovski, S., additional, Sordini, R., additional, and Zakharov, V., additional

Published
2017
Full Text
View/download PDF

20. Evolution Of The Dust Size Distribution Of Comet 67P/Churyumov-Gerasimenko From 2.2 Au To Perihelion

Author

Fulle, M., Marzari, F., Della Corte, V., Fornasier, S., Sierks, H., Rotundi, A., Barbieri, C., Lamy, P. L., Rodrigo, R., Koschny, D., Rickman, Hans, Keller, H. U., Lopez-Moreno, J. J., Accolla, M., Agarwal, J., A'Hearn, M. F., Altobelli, N., Barucci, M. A., Bertaux, J. -L, Bertini, I., Bodewits, D., Bussoletti, E., Colangeli, L., Cosi, M., Cremonese, G., Crifo, J. -F, Da Deppo, V., Davidsson, Björn, Debei, S., De Cecco, M., Esposito, F., Ferrari, M., Giovane, F., Gustafson, B., Green, S. F., Groussin, O., Gruen, E., Gutierrez, P., Guettler, C., Herranz, M. L., Hviid, S. F., Ip, W., Ivanovski, S. L., Jeronimo, J. M., Jorda, L., Knollenberg, J., Kramm, R., Kuehrt, E., Kueppers, M., Lara, L., Lazzarin, M., Leese, M. R., Lopez-Jimenez, A. C., Lucarelli, F., Epifani, E. Mazzotta, McDonnell, J. A. M., Mennella, V., Molina, A., Morales, R., Moreno, F., Mottola, S., Naletto, G., Oklay, N., Ortiz, J. L., Palomba, E., Palumbo, P., Perrin, J. -M, Rietmeijer, F. J. M., Rodriguez, J., Sordini, R., Thomas, N., Tubiana, C., Vincent, J. -B, Weissman, P., Wenzel, K. -P, Zakharov, V., Zarnecki, J. C., Fulle, M., Marzari, F., Della Corte, V., Fornasier, S., Sierks, H., Rotundi, A., Barbieri, C., Lamy, P. L., Rodrigo, R., Koschny, D., Rickman, Hans, Keller, H. U., Lopez-Moreno, J. J., Accolla, M., Agarwal, J., A'Hearn, M. F., Altobelli, N., Barucci, M. A., Bertaux, J. -L, Bertini, I., Bodewits, D., Bussoletti, E., Colangeli, L., Cosi, M., Cremonese, G., Crifo, J. -F, Da Deppo, V., Davidsson, Björn, Debei, S., De Cecco, M., Esposito, F., Ferrari, M., Giovane, F., Gustafson, B., Green, S. F., Groussin, O., Gruen, E., Gutierrez, P., Guettler, C., Herranz, M. L., Hviid, S. F., Ip, W., Ivanovski, S. L., Jeronimo, J. M., Jorda, L., Knollenberg, J., Kramm, R., Kuehrt, E., Kueppers, M., Lara, L., Lazzarin, M., Leese, M. R., Lopez-Jimenez, A. C., Lucarelli, F., Epifani, E. Mazzotta, McDonnell, J. A. M., Mennella, V., Molina, A., Morales, R., Moreno, F., Mottola, S., Naletto, G., Oklay, N., Ortiz, J. L., Palomba, E., Palumbo, P., Perrin, J. -M, Rietmeijer, F. J. M., Rodriguez, J., Sordini, R., Thomas, N., Tubiana, C., Vincent, J. -B, Weissman, P., Wenzel, K. -P, Zakharov, V., and Zarnecki, J. C.

Abstract

The Rosetta probe, orbiting Jupiter-family comet 67P/Churyumov-Gerasimenko, has been detecting individual dust particles of mass larger than 10(-10) kg by means of the GIADA dust collector and the OSIRIS Wide Angle Camera and Narrow Angle Camera since 2014 August and will continue until 2016 September. Detections of single dust particles allow us to estimate the anisotropic dust flux from 67P, infer the dust loss rate and size distribution at the surface of the sunlit nucleus, and see whether the dust size distribution of 67P evolves in time. The velocity of the Rosetta orbiter, relative to 67P, is much lower than the dust velocity measured by GIADA, thus dust counts when GIADA is nadir-pointing will directly provide the dust flux. In OSIRIS observations, the dust flux is derived from the measurement of the dust space density close to the spacecraft. Under the assumption of radial expansion of the dust, observations in the nadir direction provide the distance of the particles by measuring their trail length, with a parallax baseline determined by the motion of the spacecraft. The dust size distribution at sizes > 1 mm observed by OSIRIS is consistent with a differential power index of -4, which was derived from models of 67P's trail. At sizes <1 mm, the size distribution observed by GIADA shows a strong time evolution, with a differential power index drifting from -2 beyond 2 au to -3.7 at perihelion, in agreement with the evolution derived from coma and tail models based on ground-based data. The refractory-to-water mass ratio of the nucleus is close to six during the entire inbound orbit and at perihelion.

Published
2016
Full Text
View/download PDF

21. 67P/C-G inner coma dust properties from 2.2 au inbound to 2.0 au outbound to the Sun

Author

Della Corte, V., primary, Rotundi, A., additional, Fulle, M., additional, Ivanovski, S., additional, Green, S. F., additional, Rietmeijer, F. J. M., additional, Colangeli, L., additional, Palumbo, P., additional, Sordini, R., additional, Ferrari, M., additional, Accolla, M., additional, Zakharov, V., additional, Mazzotta Epifani, E., additional, Weissman, P., additional, Gruen, E., additional, Lopez-Moreno, J. J., additional, Rodriguez, J., additional, Bussoletti, E., additional, Crifo, J. F., additional, Esposito, F., additional, Lamy, P. L., additional, McDonnell, J. A. M., additional, Mennella, V., additional, Molina, A., additional, Morales, R., additional, Moreno, F., additional, Palomba, E., additional, Perrin, J. M., additional, Rodrigo, R., additional, Zarnecki, J. C., additional, Cosi, M., additional, Giovane, F., additional, Gustafson, B., additional, Ortiz, J. L., additional, Jeronimo, J. M., additional, Leese, M. R., additional, Herranz, M., additional, Liuzzi, V., additional, and Lopez-Jimenez, A. C., additional

Published
2016
Full Text
View/download PDF

22. Comet 67P/Churyumov–Gerasimenko preserved the pebbles that formed planetesimals

Author

Fulle, Marco, primary, Della Corte, V., additional, Rotundi, A., additional, Rietmeijer, F. J. M., additional, Green, S. F., additional, Weissman, P., additional, Accolla, M., additional, Colangeli, L., additional, Ferrari, M., additional, Ivanovski, S., additional, Lopez-Moreno, J. J., additional, Epifani, E. Mazzotta, additional, Morales, R., additional, Ortiz, J. L., additional, Palomba, E., additional, Palumbo, P., additional, Rodriguez, J., additional, Sordini, R., additional, and Zakharov, V., additional

Published
2016
Full Text
View/download PDF

23. EVOLUTION OF THE DUST SIZE DISTRIBUTION OF COMET 67P/CHURYUMOV–GERASIMENKO FROM 2.2 au TO PERIHELION

Author

Fulle, M., primary, Marzari, F., additional, Della Corte, V., additional, Fornasier, S., additional, Sierks, H., additional, Rotundi, A., additional, Barbieri, C., additional, Lamy, P. L., additional, Rodrigo, R., additional, Koschny, D., additional, Rickman, H., additional, Keller, H. U., additional, López-Moreno, J. J., additional, Accolla, M., additional, Agarwal, J., additional, A’Hearn, M. F., additional, Altobelli, N., additional, Barucci, M. A., additional, Bertaux, J.-L., additional, Bertini, I., additional, Bodewits, D., additional, Bussoletti, E., additional, Colangeli, L., additional, Cosi, M., additional, Cremonese, G., additional, Crifo, J.-F., additional, Da Deppo, V., additional, Davidsson, B., additional, Debei, S., additional, De Cecco, M., additional, Esposito, F., additional, Ferrari, M., additional, Giovane, F., additional, Gustafson, B., additional, Green, S. F., additional, Groussin, O., additional, Grün, E., additional, Gutierrez, P., additional, Güttler, C., additional, Herranz, M. L., additional, Hviid, S. F., additional, Ip, W., additional, Ivanovski, S. L., additional, Jerónimo, J. M., additional, Jorda, L., additional, Knollenberg, J., additional, Kramm, R., additional, Kührt, E., additional, Küppers, M., additional, Lara, L., additional, Lazzarin, M., additional, Leese, M. R., additional, López-Jiménez, A. C., additional, Lucarelli, F., additional, Mazzotta Epifani, E., additional, McDonnell, J. A. M., additional, Mennella, V., additional, Molina, A., additional, Morales, R., additional, Moreno, F., additional, Mottola, S., additional, Naletto, G., additional, Oklay, N., additional, Ortiz, J. L., additional, Palomba, E., additional, Palumbo, P., additional, Perrin, J.-M., additional, Rietmeijer, F. J. M., additional, Rodríguez, J., additional, Sordini, R., additional, Thomas, N., additional, Tubiana, C., additional, Vincent, J.-B., additional, Weissman, P., additional, Wenzel, K.-P., additional, Zakharov, V., additional, and Zarnecki, J. C., additional

Published
2016
Full Text
View/download PDF

24. Chemical desorption and diffusive dust chemistry

Author

Dulieu, F, Pirronello, Valerio, Minissale, M, Congiu, E, Baouche, S, Chaabouni, H, Moudens, A, Accolla, M, Cazaux, S, Manico', Giulio, and Kapteyn Astronomical Institute

Abstract

In molecular clouds, gaseous species can accrete efficiently on the cold surfaces of dust grains. As for radical-radical reactions, the surface of the grains acts as a third body, and changes dramatically the efficiency of the reactions (i.e., H2 formation), or lowers considerably the barrier to formation (i.e., H2O synthesis) in comparison with gas phase reaction processes. These properties make dust grains efficient catalytic templates. However, the chemical role of dust grains depends on the diffusive properties of the reactive partners. Over the last years, we have developed experimental tools and methods to explore the chemistry occurring on cold (6-50K) surfaces. We have obtained some hints about the diffusivity of H on amorphous ice, and studied in detail the diffusion of O atoms. The latter species appears to have a hopping rate in the range 0.01-100 hops/sec. The diffusion rate of O atoms is dependent on the surface morphology and on the surface temperature. The diffusion law is compatible with a diffusion dominated by quantum tunnelling rather than classical thermal hopping. Using H, O, N atoms and, indirectly, OH and HCO radicals, we have begun to explore many chemical reactive networks. In this presentation, I will focus on the formation of H2O and CO2, and will propose many possible formation routes to obtain these chemical traps. The molecules formed on surfaces have a certain probability of desorbing upon their formation. This non-thermal desorption mechanism, or chemical desorption, has been proposed to explain why some molecules can be detected in the gas phase of those region where they were believed to be part of the icy mantles covering dust grains. We have shown that this process can be very efficient, but is very sensitive to the substrate and the surroundings of the reaction site, is dependent on the kind of molecule formed and its chemical pathway. In my presentation I will present how the surface coverage and the type of reaction can play a major role in the chemical desorption process. I will discuss of possible key parameters that rule this process.

Published
2014

30. Dust measurements in the coma of comet 67P/Churyumov-Gerasimenko inbound to the sun

Author

Rotundi, A., Sierks, H., Della Corte, V., Fulle, M., Gutierrez, P.J., Lara, L., Barbieri, C., Lamy, P.L., Rodrigo, R., Koschny, D., Rickman, H., Keller, H.U., López-Moreno, J.J., Accolla, M., Agarwal, J., A'Hearn, M.F., Altobelli, N., Angrilli, F., Barucci, M.A., Bertaux, J.-L., Bertini, I., Bodewits, D., Bussoletti, E., Colangeli, L., Cosi, M., Cremonese, G., Crifo, J.-F., Da Deppo, V., Davidsson, B., Debei, S., De Cecco, M., Esposito, F., Ferrari, M., Fornasier, S., Giovane, F., Gustafson, B., Green, S.F., Groussin, O., Grün, E., Güttler, C., Herranz, M.L., Hviid, S.F., Ip, W., Ivanovski, S., Jerónimo, J.M., Jorda, L., Knollenberg, J., Kramm, R., Kührt, E., Küppers, M., Lazzarin, M., Leese, M.R., López-Jiménez, A.C., Lucarelli, F., Lowry, S.C., Marzari, F., Epifani, E.M., McDonnell, J.A.M., Mennella, V., Michalik, H., Molina, A., Morales, R., Moreno, F., Mottola, S., Naletto, G., Oklay, N., Ortiz, J.L., Palomba, E., Palumbo, P., Perrin, J.-M., Rodríguez, J., Sabau, L., Snodgrass, C., Sordini, R., Thomas, N., Tubiana, C., Vincent, J.-B., Weissman, P., Wenzel, K.-P., Zakharov, V., Zarnecki, J.C., Rotundi, A., Sierks, H., Della Corte, V., Fulle, M., Gutierrez, P.J., Lara, L., Barbieri, C., Lamy, P.L., Rodrigo, R., Koschny, D., Rickman, H., Keller, H.U., López-Moreno, J.J., Accolla, M., Agarwal, J., A'Hearn, M.F., Altobelli, N., Angrilli, F., Barucci, M.A., Bertaux, J.-L., Bertini, I., Bodewits, D., Bussoletti, E., Colangeli, L., Cosi, M., Cremonese, G., Crifo, J.-F., Da Deppo, V., Davidsson, B., Debei, S., De Cecco, M., Esposito, F., Ferrari, M., Fornasier, S., Giovane, F., Gustafson, B., Green, S.F., Groussin, O., Grün, E., Güttler, C., Herranz, M.L., Hviid, S.F., Ip, W., Ivanovski, S., Jerónimo, J.M., Jorda, L., Knollenberg, J., Kramm, R., Kührt, E., Küppers, M., Lazzarin, M., Leese, M.R., López-Jiménez, A.C., Lucarelli, F., Lowry, S.C., Marzari, F., Epifani, E.M., McDonnell, J.A.M., Mennella, V., Michalik, H., Molina, A., Morales, R., Moreno, F., Mottola, S., Naletto, G., Oklay, N., Ortiz, J.L., Palomba, E., Palumbo, P., Perrin, J.-M., Rodríguez, J., Sabau, L., Snodgrass, C., Sordini, R., Thomas, N., Tubiana, C., Vincent, J.-B., Weissman, P., Wenzel, K.-P., Zakharov, V., and Zarnecki, J.C.

Abstract

Critical measurements for understanding accretion and the dust/gas ratio in the solar nebula, where planets were forming 4.5 billion years ago, are being obtained by the GIADA (Grain Impact Analyser and Dust Accumulator) experiment on the European Space Agency's Rosetta spacecraft orbiting comet 67P/Churyumov-Gerasimenko. Between 3.6 and 3.4 astronomical units inbound, GIADA and OSIRIS (Optical, Spectroscopic, and Infrared Remote Imaging System) detected 35 outflowing grains of mass 10-10 to 10-7 kilograms, and 48 grains of mass 10-5 to 10-2 kilograms, respectively. Combined with gas data from the MIRO (Microwave Instrument for the Rosetta Orbiter) and ROSINA (Rosetta Orbiter Spectrometer for Ion and Neutral Analysis) instruments, we find a dust/gas mass ratio of 4 ± 2 averaged over the sunlit nucleus surface. A cloud of larger grains also encircles the nucleus in bound orbits from the previous perihelion. The largest orbiting clumps are meter-sized, confirming the dust/gas ratio of 3 inferred at perihelion from models of dust comae and trails. © 2015, American Association for the Advancement of Science. All rights reserved.

Published
2015

31. GIADA: shining a light on the monitoring of the comet dust production from the nucleus of 67P/Churyumov-Gerasimenko

Author

Della Corte, V., primary, Rotundi, A., additional, Fulle, M., additional, Gruen, E., additional, Weissman, P., additional, Sordini, R., additional, Ferrari, M., additional, Ivanovski, S., additional, Lucarelli, F., additional, Accolla, M., additional, Zakharov, V., additional, Mazzotta Epifani, E., additional, Lopez-Moreno, J. J., additional, Rodriguez, J., additional, Colangeli, L., additional, Palumbo, P., additional, Bussoletti, E., additional, Crifo, J. F., additional, Esposito, F., additional, Green, S. F., additional, Lamy, P. L., additional, McDonnell, J. A. M., additional, Mennella, V., additional, Molina, A., additional, Morales, R., additional, Moreno, F., additional, Ortiz, J. L., additional, Palomba, E., additional, Perrin, J. M., additional, Rietmeijer, F. J. M., additional, Rodrigo, R., additional, Zarnecki, J. C., additional, Cosi, M., additional, Giovane, F., additional, Gustafson, B., additional, Herranz, M. L., additional, Jeronimo, J. M., additional, Leese, M. R., additional, Lopez-Jimenez, A. C., additional, and Altobelli, N., additional

Published
2015
Full Text
View/download PDF

32. DENSITY AND CHARGE OF PRISTINE FLUFFY PARTICLES FROM COMET 67P/CHURYUMOV–GERASIMENKO

Author

Fulle, M., primary, Corte, V. Della, additional, Rotundi, A., additional, Weissman, P., additional, Juhasz, A., additional, Szego, K., additional, Sordini, R., additional, Ferrari, M., additional, Ivanovski, S., additional, Lucarelli, F., additional, Accolla, M., additional, Merouane, S., additional, Zakharov, V., additional, Epifani, E. Mazzotta, additional, Moreno, J. J. López-, additional, Rodríguez, J., additional, Colangeli, L., additional, Palumbo, P., additional, Grün, E., additional, Hilchenbach, M., additional, Bussoletti, E., additional, Esposito, F., additional, Green, S. F., additional, Lamy, P. L., additional, McDonnell, J. A. M., additional, Mennella, V., additional, Molina, A., additional, Morales, R., additional, Moreno, F., additional, Ortiz, J. L., additional, Palomba, E., additional, Rodrigo, R., additional, Zarnecki, J. C., additional, Cosi, M., additional, Giovane, F., additional, Gustafson, B., additional, Herranz, M. L., additional, Jerónimo, J. M., additional, Leese, M. R., additional, Jiménez, A. C. López-, additional, and Altobelli, N., additional

Published
2015
Full Text
View/download PDF

36. Dust Measurements in the Coma of Comet 67P/Churyumov-Gerasimenko Inbound to the Sun Between 3.7 and 3.4 AU

Author

Fulle, M., Della Corte, V., Rotundi, A., Accolla, M., Ferrari, M., Ivanovski, S., Lucarelli, F., Sordini, R., Zakharov, V., Mazzotta Epifani, E., Lopez-Moreno, J. J., Rodriguez, J., Colangeli, L., Palumbo, P., Bussoletti, E., Crifo, J., Francesca Esposito, Green, S. F., Gruen, E., Lamy, P. L., Mcdonnell, J. A. M., Mennella, V., Molina, A., Morales, R., Moreno, F., Ortiz, J. L., Palomba, E., Perrin, J., Rodrigo, R., Weissman, P., Zarnecki, J. C., Cosi, M., Giovane, F., Gustafson, B., Herranz, M. L., Jeronimo, J. M., Leese, M. R., Lopez-Jimenez, A. C., Altobelli, N., Sierks, H., Agarwal, J., Bertini, I., Fornasier, S., Gutierrez, P. J., Lara, L., Guettler, C., Marzari, F., Oaklay, N., Snodgrass, C., Tubiana, C., and Vincenzo, J. B.

Abstract

GIADA and OSIRIS dust data, combined with data from MIRO and ROSINA instruments onboard Rosetta, from 3.7 to 3.4 AU inbound provide a dust/gas ratio of 4 ± 2.

38. The dust-to-ices ratio in comets and Kuiper belt objects

Author

Fulle, M., Della Corte, V., Rotundi, A., Green, S. F., Accolla, M., Colangeli, L., Ferrari, M., Ivanovski, S., Sordini, R., Zakharov, V., Fulle, M., Della Corte, V., Rotundi, A., Green, S. F., Accolla, M., Colangeli, L., Ferrari, M., Ivanovski, S., Sordini, R., and Zakharov, V.

Full Text
View/download PDF

39. Comet 67P/Churyumov-Gerasimenko preserved the pebbles that formed planetesimals

Author

Fulle, Marco, Della Corte, V., Rotundi, A., Rietmeijer, F. J. M., Green, S., Weissman, P., Accolla, M., Colangeli, L., Ferrari, M., Ivanovski, S., Lopez-Moreno, J. J., Mazzotta Epifani, E., Morales, R., Ortiz, J. L., Palomba, E., Palumbo, P., Rodriguez, J., Sordini, R., Zakharov, V., Fulle, Marco, Della Corte, V., Rotundi, A., Rietmeijer, F. J. M., Green, S., Weissman, P., Accolla, M., Colangeli, L., Ferrari, M., Ivanovski, S., Lopez-Moreno, J. J., Mazzotta Epifani, E., Morales, R., Ortiz, J. L., Palomba, E., Palumbo, P., Rodriguez, J., Sordini, R., and Zakharov, V.

40. GIADA performance during Rosetta mission scientific operations at comet 67P

Author

Sordini, R., Della Corte, V., Rotundi, A., Rotunno, S., Ferrari, M., Ivanovski, S.L., Colangeli, L., Palumbo, P., Lopez-Moreno, J.J., Rodriguez, J., Fulle, M., Green, S.F., Mazzotta-Epifani, E., Morales, R., Accolla, M., Palomba, E., Cosi, M., Herranz, M., Liuzzi, V., Sordini, R., Della Corte, V., Rotundi, A., Rotunno, S., Ferrari, M., Ivanovski, S.L., Colangeli, L., Palumbo, P., Lopez-Moreno, J.J., Rodriguez, J., Fulle, M., Green, S.F., Mazzotta-Epifani, E., Morales, R., Accolla, M., Palomba, E., Cosi, M., Herranz, M., and Liuzzi, V.

Abstract

The Grain Impact Analyser and Dust Accumulator (GIADA) instrument onboard Rosetta studied the dust environment of comet 67P/Churyumov–Gerasimenko from 3.7 au inbound, through perihelion, to 3.8 au outbound, measuring the dust flow and the dynamic properties of individual particles. GIADA is composed of three subsystems: 1) Grain Detection System (GDS); 2) Impact Sensor (IS); and 3) Micro-Balances System (MBS). Monitoring the subsystems’ performance during operations is an important element for the correct calibration of scientific measurements. In this paper, we analyse the GIADA inflight calibration data obtained by internal calibration devices for the three subsystems during the period from 1 August 2014 to 31 October 2015. The calibration data testify a nominal behaviour of the instrument during these fifteen months of mission; the only exception is a minor loss of sensitivity for one of the two GDS receivers, attributed to dust contamination.

41. 67P/C-G Inner Coma dust properties from 2.2 au inbound to 2.0 au outbound to the Sun

Author

Della Corte, V., Rotundi, A., Fulle, M., Ivanovski, S., Green, S. F., Rietmeijer, F. J. M., Colangeli, L., Palumbo, P., Sordini, R., Ferrari, M., Accolla, M., Zakharov, V., Mazzotta Epifani, E., Weissman, P., Gruen, E., Lopez-Moreno, J. J., Rodriguez, J., Bussoletti, E., Crifo, J. F., Esposito, F., Lamy, P. L., McDonnell, J. A. M., Mennella, V., Molina, A., Morales, R., Moreno, F., Palomba, E., Perrin, J. M., Rodrigo, R., Zarnecki, J. C., Cosi, M., Giovane, F., Gustafson, B., Ortiz, J. L., Jeronimo, J. M., Leese, M. R., Herranz, M., Liuzzi, V., Lopez-Jimenez, A. C., Della Corte, V., Rotundi, A., Fulle, M., Ivanovski, S., Green, S. F., Rietmeijer, F. J. M., Colangeli, L., Palumbo, P., Sordini, R., Ferrari, M., Accolla, M., Zakharov, V., Mazzotta Epifani, E., Weissman, P., Gruen, E., Lopez-Moreno, J. J., Rodriguez, J., Bussoletti, E., Crifo, J. F., Esposito, F., Lamy, P. L., McDonnell, J. A. M., Mennella, V., Molina, A., Morales, R., Moreno, F., Palomba, E., Perrin, J. M., Rodrigo, R., Zarnecki, J. C., Cosi, M., Giovane, F., Gustafson, B., Ortiz, J. L., Jeronimo, J. M., Leese, M. R., Herranz, M., Liuzzi, V., and Lopez-Jimenez, A. C.

Abstract

GIADA (Grain Impact Analyzer and Dust Accumulator) on-board the Rosetta space probe is designed to measure the momentum, mass and speed of individual dust particles escaping the nucleus of comet 67P/Churyumov-Gerasimenko (hereafter 67P). From August 2014 to June 2016 Rosetta escorted comet 67P during its journey around the Sun. Here we focus on GIADA data taken between 2015 January and 2016 February which included 67P's perihelion passage. To better understand cometary activity and more specifically the presence of dust structures in cometary comae, we mapped the spatial distribution of dust density in 67P's coma. In this manner we could track the evolution of high density regions of coma dust and their connections with nucleus illumination conditions, namely tracking 67P's seasons. We also studied the link between dust particle speeds and their masses with respect to heliocentric distance, i.e. the level of cometary activity. This allowed us to derive a global and a local correlation of the dust particles’ speed distribution with respect to the H2O production rate.

42. Evolution of the Dust Size Distribution of Comet 67P/Churyumov–Gerasimenko from 2.2 au to Perihelion

Author

Fulle, M., Marzari, F., Della Corte, V., Fornasier, S., Sierks, H., Rotundi, A., Barbieri, C., Lamy, P. L., Rodrigo, R., Koschny, D., Rickman, H., Keller, H. U., López-Moreno, J. J., Accolla, M., Agarwal, J., A’Hearn, M. F., Altobelli, N., Barucci, M. A., Bertaux, J.-L., Bertini, I., Bodewits, D., Bussoletti, E., Colangeli, L., Cosi, M., Cremonese, G., Crifo, J.-F., Da Deppo, V., Davidsson, B., Debei, S., De Cecco, M., Esposito, F., Ferrari, M., Giovane, F., Gustafson, B., Green, S. F., Groussin, O., Grün, E., Gutierrez, P., Güttler, C., Herranz, M. L., Hviid, S. F., Ip, W., Ivanovski, S. L., Jerónimo, J. M., Jorda, L., Knollenberg, J., Kramm, R., Kührt, E., Küppers, M., Lara, L., Lazzarin, M., Leese, M. R., López-Jiménez, A. C., Lucarelli, F., Mazzotta Epifani, E., McDonnell, J. A. M., Mennella, V., Molina, A., Morales, R., Moreno, F., Mottola, S., Naletto, G., Oklay, N., Ortiz, J. L., Palomba, E., Palumbo, P., Perrin, J.-M., Rietmeijer, F. J. M., Rodríguez, J., Sordini, R., Thomas, N., Tubiana, C., Vincent, J.-B., Weissman, P., Wenzel, K.-P., Zakharov, V., Zarnecki, J. C., Fulle, M., Marzari, F., Della Corte, V., Fornasier, S., Sierks, H., Rotundi, A., Barbieri, C., Lamy, P. L., Rodrigo, R., Koschny, D., Rickman, H., Keller, H. U., López-Moreno, J. J., Accolla, M., Agarwal, J., A’Hearn, M. F., Altobelli, N., Barucci, M. A., Bertaux, J.-L., Bertini, I., Bodewits, D., Bussoletti, E., Colangeli, L., Cosi, M., Cremonese, G., Crifo, J.-F., Da Deppo, V., Davidsson, B., Debei, S., De Cecco, M., Esposito, F., Ferrari, M., Giovane, F., Gustafson, B., Green, S. F., Groussin, O., Grün, E., Gutierrez, P., Güttler, C., Herranz, M. L., Hviid, S. F., Ip, W., Ivanovski, S. L., Jerónimo, J. M., Jorda, L., Knollenberg, J., Kramm, R., Kührt, E., Küppers, M., Lara, L., Lazzarin, M., Leese, M. R., López-Jiménez, A. C., Lucarelli, F., Mazzotta Epifani, E., McDonnell, J. A. M., Mennella, V., Molina, A., Morales, R., Moreno, F., Mottola, S., Naletto, G., Oklay, N., Ortiz, J. L., Palomba, E., Palumbo, P., Perrin, J.-M., Rietmeijer, F. J. M., Rodríguez, J., Sordini, R., Thomas, N., Tubiana, C., Vincent, J.-B., Weissman, P., Wenzel, K.-P., Zakharov, V., and Zarnecki, J. C.

Abstract

The Rosetta probe, orbiting Jupiter-family comet 67P/Churyumov–Gerasimenko, has been detecting individual dust particles of mass larger than 10^(−10) kg by means of the GIADA dust collector and the OSIRIS Wide Angle Camera and Narrow Angle Camera since 2014 August and will continue until 2016 September. Detections of single dust particles allow us to estimate the anisotropic dust flux from 67P, infer the dust loss rate and size distribution at the surface of the sunlit nucleus, and see whether the dust size distribution of 67P evolves in time. The velocity of the Rosetta orbiter, relative to 67P, is much lower than the dust velocity measured by GIADA, thus dust counts when GIADA is nadir-pointing will directly provide the dust flux. In OSIRIS observations, the dust flux is derived from the measurement of the dust space density close to the spacecraft. Under the assumption of radial expansion of the dust, observations in the nadir direction provide the distance of the particles by measuring their trail length, with a parallax baseline determined by the motion of the spacecraft. The dust size distribution at sizes >1 mm observed by OSIRIS is consistent with a differential power index of −4, which was derived from models of 67P’s trail. At sizes <1 mm, the size distribution observed by GIADA shows a strong time evolution, with a differential power index drifting from −2 beyond 2 au to −3.7 at perihelion, in agreement with the evolution derived from coma and tail models based on ground-based data. The refractory-to-water mass ratio of the nucleus is close to six during the entire inbound orbit and at perihelion.

43. GIADA: its status after the Rosetta cruise phase and on-ground activity in support of the encounter with comet 67P/Churyumov-Gerasimenko

Author

Della Corte, V., Rotundi, A., Accolla, M., Sordini, R., Palumbo, P., Colangeli, L., Lopez-Moreno, J. J., Rodriguez, J., Rietmeijer, F. J. M., Ferrari, M., Lucarelli, F., Mazzotta Epifani, E., Ivanovski, S., Aronica, A., Cosi, M., Bussoletti, E., Crifo, J. F., Esposito, F., Fulle, M., Green, S. F., Gruen, E., Herranz, M. L., Jeronimo, J. M., Lamy, P., Lopez Jimenez, A., McDonnell, J. A. M., Mennella, V., Molina, A., Morales, R., Moreno, F., Palomba, E., Perrin, J. M., Rodrigo, R., Weissman, P., Zakharov, V., Zarnecki, J. C., Della Corte, V., Rotundi, A., Accolla, M., Sordini, R., Palumbo, P., Colangeli, L., Lopez-Moreno, J. J., Rodriguez, J., Rietmeijer, F. J. M., Ferrari, M., Lucarelli, F., Mazzotta Epifani, E., Ivanovski, S., Aronica, A., Cosi, M., Bussoletti, E., Crifo, J. F., Esposito, F., Fulle, M., Green, S. F., Gruen, E., Herranz, M. L., Jeronimo, J. M., Lamy, P., Lopez Jimenez, A., McDonnell, J. A. M., Mennella, V., Molina, A., Morales, R., Moreno, F., Palomba, E., Perrin, J. M., Rodrigo, R., Weissman, P., Zakharov, V., and Zarnecki, J. C.

Abstract

GIADA (Grain Impact Analyser and Dust Accumulator) on-board the Rosetta mission to comet 67P/Churyumov-Gerasimenko was designed to study the physical and dynamical properties of dust particles ejected by the comet during the encounter. In this paper we report the results of the analysis of data collected by GIADA during the past seven years of the cruise phase. During this period the GIADA detection subsystems were switched on for periodic in-flight payload checkouts to monitor their state of-health including potential changes in its performance that could affect its data collection. Only slight variations in sensitivity and dynamical range were identified that will not affect the GIADA measurement capability during the Rosetta comet encounter and rendezvous phase. The GIADA microbalance system detected the presence of low-volatility material over a period of about 169 days when the GIADA cover remained partially opened. It is highly probable that this material originated from the spacecraft itself, as a spacecraft’s outgassing was observed by the ROSINA mass spectrometer (on-board Rosetta) during the cruise phase. The identification of the low-volatility mass deposited on the microbalances as self-contamination will allow us to evaluate the mass rate background to be subtracted from the GIADA science data. These results obtained from GIADA cruise data analysis coupled with laboratory calibration data obtained from measurements using the GIADA spare model for selected cometary dust analogs will be the basis for the interpretation of the GIADA scientific data.

44. Density and Charge of Pristine Fluffy Particles from Comet 67P/Churyumov–Gerasimenko

Author

Fulle, M., Della Corte, V., Rotundi, A., Weissman, P., Juhasz, A., Szego, K., Sordini, R., Ferrari, M., Ivanovski, S., Lucarelli, F., Accolla, M., Merouane, S., Zakharov, V., Mazzotta Epifani, E., López-Moreno, J. J., Rodríguez, J., Colangeli, L., Palumbo, P., Grün, E., Hilchenbach, M., Bussoletti, E., Esposito, F., Green, S. F., Lamy, P. L., McDonnell, J. A. M., Mennella, V., Molina, A., Morales, R., Moreno, F., Ortiz, J. L., Palomba, E., Rodrigo, R., Zarnecki, J. C., Cosi, M., Giovane, F., Gustafson, B., Herranz, M. L., Jerónimo, J. M., Leese, M. R., López-Jiménez, A. C., Altobelli, N., Fulle, M., Della Corte, V., Rotundi, A., Weissman, P., Juhasz, A., Szego, K., Sordini, R., Ferrari, M., Ivanovski, S., Lucarelli, F., Accolla, M., Merouane, S., Zakharov, V., Mazzotta Epifani, E., López-Moreno, J. J., Rodríguez, J., Colangeli, L., Palumbo, P., Grün, E., Hilchenbach, M., Bussoletti, E., Esposito, F., Green, S. F., Lamy, P. L., McDonnell, J. A. M., Mennella, V., Molina, A., Morales, R., Moreno, F., Ortiz, J. L., Palomba, E., Rodrigo, R., Zarnecki, J. C., Cosi, M., Giovane, F., Gustafson, B., Herranz, M. L., Jerónimo, J. M., Leese, M. R., López-Jiménez, A. C., and Altobelli, N.

Abstract

The Grain Impact Analyzer and Dust Accumulator (GIADA) instrument on board ESA’s Rosetta mission is constraining the origin of the dust particles detected within the coma of comet 67 P/Churyumov–Gerasimenko (67P). The collected particles belong to two families: (i) compact particles (ranging in size from 0.03 to 1 mm), witnessing the presence of materials that underwent processing within the solar nebula and (ii) fluffy aggregates (ranging in size from 0.2 to 2.5 mm) of sub-micron grains that may be a record of a primitive component, probably linked to interstellar dust. The dynamics of the fluffy aggregates constrain their equivalent bulk density to <1 kg m-3. These aggregates are charged, fragmented, and decelerated by the spacecraft negative potential and enter GIADA in showers of fragments at speeds <1 m s-1. The density of such optically thick aggregates is consistent with the low bulk density of the nucleus. The mass contribution of the fluffy aggregates to the refractory component of the nucleus is negligible and their coma brightness contribution is less than 15%.

45. GIADA: shining a light on the monitoring of the comet dust production from the nucleus of 67P/Churyumov Gerasimenko

Author

Della Corte, V., Rotundi, A., Fulle, M., Gruen, E., Weissmann, P., Sordini, R., Ferrari, M., Ivanovski, S., Lucarelli, F., Accolla, M., Zakharov, V., Mazzotta Epifani, E., Lopez-Moreno, J. J., Rodriguez, J., Colangeli, L., Palumbo, P., Bussoletti, E., Crifo, J. F., Esposito, F., Green, S. F., Lamy, P. L., McDonnell, J. A. M, Mennella, V., Molina, A., Morales, R., Moreno, F., Ortiz, J. L., Palomba, E., Perrin, J. M., Rietmeijer, F. J. M., Rodrigo, R., Zarnecki, J. C., Cosi, M., Giovane, F., Gustafson, B., Herranz, M. L., Jeronimo, J. M., Leese, M. R., Lopez-Jimenez, A. C., Altobelli, N., Della Corte, V., Rotundi, A., Fulle, M., Gruen, E., Weissmann, P., Sordini, R., Ferrari, M., Ivanovski, S., Lucarelli, F., Accolla, M., Zakharov, V., Mazzotta Epifani, E., Lopez-Moreno, J. J., Rodriguez, J., Colangeli, L., Palumbo, P., Bussoletti, E., Crifo, J. F., Esposito, F., Green, S. F., Lamy, P. L., McDonnell, J. A. M, Mennella, V., Molina, A., Morales, R., Moreno, F., Ortiz, J. L., Palomba, E., Perrin, J. M., Rietmeijer, F. J. M., Rodrigo, R., Zarnecki, J. C., Cosi, M., Giovane, F., Gustafson, B., Herranz, M. L., Jeronimo, J. M., Leese, M. R., Lopez-Jimenez, A. C., and Altobelli, N.

Abstract

Context. During the period between 15 September 2014 and 4 February 2015, the Rosetta spacecraft accomplished the circular orbit phase around the nucleus of comet 67P/Churyumov-Gerasimenko (67P). The Grain Impact Analyzer and Dust Accumulator (GIADA) onboard Rosetta monitored the 67P coma dust environment for the entire period. Aims. We aim to describe the dust spatial distribution in the coma of comet 67P by means of in situ measurements. We determine dynamical and physical properties of cometary dust particles to support the study of the production process and dust environment modification. Methods. We analyzed GIADA data with respect to the observation geometry and heliocentric distance to describe the coma dust spatial distribution of 67P, to monitor its activity, and to retrieve information on active areas present on its nucleus. We combined GIADA detection information with calibration activity to distinguish different types of particles that populate the coma of 67P: compact particles and fluffy porous aggregates. By means of particle dynamical parameters measured by GIADA, we studied the dust acceleration region. Results. GIADA was able to distinguish different types of particles populating the coma of 67P: compact particles and fluffy porous aggregates. Most of the compact particle detections occurred at latitudes and longitudes where the spacecraft was in view of the comet’s neck region of the nucleus, the so-called Hapi region. This resulted in an oscillation of the compact particle abundance with respect to the spacecraft position and a global increase as the comet moved from 3.36 to 2.43 AU heliocentric distance. The speed of these particles, having masses from 10-10 to 10-7 kg, ranged from 0.3 to 12.2 m s−1. The variation of particle mass and speed distribution with respect to the distance from the nucleus gave indications of the dust acceleration region. The influen

46. GIADA performance during Rosetta mission scientific operations at comet 67P

Author

Sordini, R., Della Corte, V., Rotundi, A., Rotunno, S., Ferrari, M., Ivanovski, S.L., Colangeli, L., Palumbo, P., Lopez-Moreno, J.J., Rodriguez, J., Fulle, M., Green, S.F., Mazzotta-Epifani, E., Morales, R., Accolla, M., Palomba, E., Cosi, M., Herranz, M., Liuzzi, V., Sordini, R., Della Corte, V., Rotundi, A., Rotunno, S., Ferrari, M., Ivanovski, S.L., Colangeli, L., Palumbo, P., Lopez-Moreno, J.J., Rodriguez, J., Fulle, M., Green, S.F., Mazzotta-Epifani, E., Morales, R., Accolla, M., Palomba, E., Cosi, M., Herranz, M., and Liuzzi, V.

Abstract

The Grain Impact Analyser and Dust Accumulator (GIADA) instrument onboard Rosetta studied the dust environment of comet 67P/Churyumov–Gerasimenko from 3.7 au inbound, through perihelion, to 3.8 au outbound, measuring the dust flow and the dynamic properties of individual particles. GIADA is composed of three subsystems: 1) Grain Detection System (GDS); 2) Impact Sensor (IS); and 3) Micro-Balances System (MBS). Monitoring the subsystems’ performance during operations is an important element for the correct calibration of scientific measurements. In this paper, we analyse the GIADA inflight calibration data obtained by internal calibration devices for the three subsystems during the period from 1 August 2014 to 31 October 2015. The calibration data testify a nominal behaviour of the instrument during these fifteen months of mission; the only exception is a minor loss of sensitivity for one of the two GDS receivers, attributed to dust contamination.

Full Text
View/download PDF

47. 67P/C-G Inner Coma dust properties from 2.2 au inbound to 2.0 au outbound to the Sun

Author

Della Corte, V., Rotundi, A., Fulle, M., Ivanovski, S., Green, S. F., Rietmeijer, F. J. M., Colangeli, L., Palumbo, P., Sordini, R., Ferrari, M., Accolla, M., Zakharov, V., Mazzotta Epifani, E., Weissman, P., Gruen, E., Lopez-Moreno, J. J., Rodriguez, J., Bussoletti, E., Crifo, J. F., Esposito, F., Lamy, P. L., McDonnell, J. A. M., Mennella, V., Molina, A., Morales, R., Moreno, F., Palomba, E., Perrin, J. M., Rodrigo, R., Zarnecki, J. C., Cosi, M., Giovane, F., Gustafson, B., Ortiz, J. L., Jeronimo, J. M., Leese, M. R., Herranz, M., Liuzzi, V., Lopez-Jimenez, A. C., Della Corte, V., Rotundi, A., Fulle, M., Ivanovski, S., Green, S. F., Rietmeijer, F. J. M., Colangeli, L., Palumbo, P., Sordini, R., Ferrari, M., Accolla, M., Zakharov, V., Mazzotta Epifani, E., Weissman, P., Gruen, E., Lopez-Moreno, J. J., Rodriguez, J., Bussoletti, E., Crifo, J. F., Esposito, F., Lamy, P. L., McDonnell, J. A. M., Mennella, V., Molina, A., Morales, R., Moreno, F., Palomba, E., Perrin, J. M., Rodrigo, R., Zarnecki, J. C., Cosi, M., Giovane, F., Gustafson, B., Ortiz, J. L., Jeronimo, J. M., Leese, M. R., Herranz, M., Liuzzi, V., and Lopez-Jimenez, A. C.

Abstract

GIADA (Grain Impact Analyzer and Dust Accumulator) on-board the Rosetta space probe is designed to measure the momentum, mass and speed of individual dust particles escaping the nucleus of comet 67P/Churyumov-Gerasimenko (hereafter 67P). From August 2014 to June 2016 Rosetta escorted comet 67P during its journey around the Sun. Here we focus on GIADA data taken between 2015 January and 2016 February which included 67P's perihelion passage. To better understand cometary activity and more specifically the presence of dust structures in cometary comae, we mapped the spatial distribution of dust density in 67P's coma. In this manner we could track the evolution of high density regions of coma dust and their connections with nucleus illumination conditions, namely tracking 67P's seasons. We also studied the link between dust particle speeds and their masses with respect to heliocentric distance, i.e. the level of cometary activity. This allowed us to derive a global and a local correlation of the dust particles’ speed distribution with respect to the H2O production rate.

48. Density and Charge of Pristine Fluffy Particles from Comet 67P/Churyumov–Gerasimenko

Author

Fulle, M., Della Corte, V., Rotundi, A., Weissman, P., Juhasz, A., Szego, K., Sordini, R., Ferrari, M., Ivanovski, S., Lucarelli, F., Accolla, M., Merouane, S., Zakharov, V., Mazzotta Epifani, E., López-Moreno, J. J., Rodríguez, J., Colangeli, L., Palumbo, P., Grün, E., Hilchenbach, M., Bussoletti, E., Esposito, F., Green, S. F., Lamy, P. L., McDonnell, J. A. M., Mennella, V., Molina, A., Morales, R., Moreno, F., Ortiz, J. L., Palomba, E., Rodrigo, R., Zarnecki, J. C., Cosi, M., Giovane, F., Gustafson, B., Herranz, M. L., Jerónimo, J. M., Leese, M. R., López-Jiménez, A. C., Altobelli, N., Fulle, M., Della Corte, V., Rotundi, A., Weissman, P., Juhasz, A., Szego, K., Sordini, R., Ferrari, M., Ivanovski, S., Lucarelli, F., Accolla, M., Merouane, S., Zakharov, V., Mazzotta Epifani, E., López-Moreno, J. J., Rodríguez, J., Colangeli, L., Palumbo, P., Grün, E., Hilchenbach, M., Bussoletti, E., Esposito, F., Green, S. F., Lamy, P. L., McDonnell, J. A. M., Mennella, V., Molina, A., Morales, R., Moreno, F., Ortiz, J. L., Palomba, E., Rodrigo, R., Zarnecki, J. C., Cosi, M., Giovane, F., Gustafson, B., Herranz, M. L., Jerónimo, J. M., Leese, M. R., López-Jiménez, A. C., and Altobelli, N.

Abstract

The Grain Impact Analyzer and Dust Accumulator (GIADA) instrument on board ESA’s Rosetta mission is constraining the origin of the dust particles detected within the coma of comet 67 P/Churyumov–Gerasimenko (67P). The collected particles belong to two families: (i) compact particles (ranging in size from 0.03 to 1 mm), witnessing the presence of materials that underwent processing within the solar nebula and (ii) fluffy aggregates (ranging in size from 0.2 to 2.5 mm) of sub-micron grains that may be a record of a primitive component, probably linked to interstellar dust. The dynamics of the fluffy aggregates constrain their equivalent bulk density to <1 kg m-3. These aggregates are charged, fragmented, and decelerated by the spacecraft negative potential and enter GIADA in showers of fragments at speeds <1 m s-1. The density of such optically thick aggregates is consistent with the low bulk density of the nucleus. The mass contribution of the fluffy aggregates to the refractory component of the nucleus is negligible and their coma brightness contribution is less than 15%.

49. Evolution of the Dust Size Distribution of Comet 67P/Churyumov–Gerasimenko from 2.2 au to Perihelion

Author

Fulle, M., Marzari, F., Della Corte, V., Fornasier, S., Sierks, H., Rotundi, A., Barbieri, C., Lamy, P. L., Rodrigo, R., Koschny, D., Rickman, H., Keller, H. U., López-Moreno, J. J., Accolla, M., Agarwal, J., A’Hearn, M. F., Altobelli, N., Barucci, M. A., Bertaux, J.-L., Bertini, I., Bodewits, D., Bussoletti, E., Colangeli, L., Cosi, M., Cremonese, G., Crifo, J.-F., Da Deppo, V., Davidsson, B., Debei, S., De Cecco, M., Esposito, F., Ferrari, M., Giovane, F., Gustafson, B., Green, S. F., Groussin, O., Grün, E., Gutierrez, P., Güttler, C., Herranz, M. L., Hviid, S. F., Ip, W., Ivanovski, S. L., Jerónimo, J. M., Jorda, L., Knollenberg, J., Kramm, R., Kührt, E., Küppers, M., Lara, L., Lazzarin, M., Leese, M. R., López-Jiménez, A. C., Lucarelli, F., Mazzotta Epifani, E., McDonnell, J. A. M., Mennella, V., Molina, A., Morales, R., Moreno, F., Mottola, S., Naletto, G., Oklay, N., Ortiz, J. L., Palomba, E., Palumbo, P., Perrin, J.-M., Rietmeijer, F. J. M., Rodríguez, J., Sordini, R., Thomas, N., Tubiana, C., Vincent, J.-B., Weissman, P., Wenzel, K.-P., Zakharov, V., Zarnecki, J. C., Fulle, M., Marzari, F., Della Corte, V., Fornasier, S., Sierks, H., Rotundi, A., Barbieri, C., Lamy, P. L., Rodrigo, R., Koschny, D., Rickman, H., Keller, H. U., López-Moreno, J. J., Accolla, M., Agarwal, J., A’Hearn, M. F., Altobelli, N., Barucci, M. A., Bertaux, J.-L., Bertini, I., Bodewits, D., Bussoletti, E., Colangeli, L., Cosi, M., Cremonese, G., Crifo, J.-F., Da Deppo, V., Davidsson, B., Debei, S., De Cecco, M., Esposito, F., Ferrari, M., Giovane, F., Gustafson, B., Green, S. F., Groussin, O., Grün, E., Gutierrez, P., Güttler, C., Herranz, M. L., Hviid, S. F., Ip, W., Ivanovski, S. L., Jerónimo, J. M., Jorda, L., Knollenberg, J., Kramm, R., Kührt, E., Küppers, M., Lara, L., Lazzarin, M., Leese, M. R., López-Jiménez, A. C., Lucarelli, F., Mazzotta Epifani, E., McDonnell, J. A. M., Mennella, V., Molina, A., Morales, R., Moreno, F., Mottola, S., Naletto, G., Oklay, N., Ortiz, J. L., Palomba, E., Palumbo, P., Perrin, J.-M., Rietmeijer, F. J. M., Rodríguez, J., Sordini, R., Thomas, N., Tubiana, C., Vincent, J.-B., Weissman, P., Wenzel, K.-P., Zakharov, V., and Zarnecki, J. C.

Abstract

The Rosetta probe, orbiting Jupiter-family comet 67P/Churyumov–Gerasimenko, has been detecting individual dust particles of mass larger than 10^(−10) kg by means of the GIADA dust collector and the OSIRIS Wide Angle Camera and Narrow Angle Camera since 2014 August and will continue until 2016 September. Detections of single dust particles allow us to estimate the anisotropic dust flux from 67P, infer the dust loss rate and size distribution at the surface of the sunlit nucleus, and see whether the dust size distribution of 67P evolves in time. The velocity of the Rosetta orbiter, relative to 67P, is much lower than the dust velocity measured by GIADA, thus dust counts when GIADA is nadir-pointing will directly provide the dust flux. In OSIRIS observations, the dust flux is derived from the measurement of the dust space density close to the spacecraft. Under the assumption of radial expansion of the dust, observations in the nadir direction provide the distance of the particles by measuring their trail length, with a parallax baseline determined by the motion of the spacecraft. The dust size distribution at sizes >1 mm observed by OSIRIS is consistent with a differential power index of −4, which was derived from models of 67P’s trail. At sizes <1 mm, the size distribution observed by GIADA shows a strong time evolution, with a differential power index drifting from −2 beyond 2 au to −3.7 at perihelion, in agreement with the evolution derived from coma and tail models based on ground-based data. The refractory-to-water mass ratio of the nucleus is close to six during the entire inbound orbit and at perihelion.

50. GIADA: shining a light on the monitoring of the comet dust production from the nucleus of 67P/Churyumov Gerasimenko

Author

Della Corte, V., Rotundi, A., Fulle, M., Gruen, E., Weissmann, P., Sordini, R., Ferrari, M., Ivanovski, S., Lucarelli, F., Accolla, M., Zakharov, V., Mazzotta Epifani, E., Lopez-Moreno, J. J., Rodriguez, J., Colangeli, L., Palumbo, P., Bussoletti, E., Crifo, J. F., Esposito, F., Green, S. F., Lamy, P. L., McDonnell, J. A. M, Mennella, V., Molina, A., Morales, R., Moreno, F., Ortiz, J. L., Palomba, E., Perrin, J. M., Rietmeijer, F. J. M., Rodrigo, R., Zarnecki, J. C., Cosi, M., Giovane, F., Gustafson, B., Herranz, M. L., Jeronimo, J. M., Leese, M. R., Lopez-Jimenez, A. C., Altobelli, N., Della Corte, V., Rotundi, A., Fulle, M., Gruen, E., Weissmann, P., Sordini, R., Ferrari, M., Ivanovski, S., Lucarelli, F., Accolla, M., Zakharov, V., Mazzotta Epifani, E., Lopez-Moreno, J. J., Rodriguez, J., Colangeli, L., Palumbo, P., Bussoletti, E., Crifo, J. F., Esposito, F., Green, S. F., Lamy, P. L., McDonnell, J. A. M, Mennella, V., Molina, A., Morales, R., Moreno, F., Ortiz, J. L., Palomba, E., Perrin, J. M., Rietmeijer, F. J. M., Rodrigo, R., Zarnecki, J. C., Cosi, M., Giovane, F., Gustafson, B., Herranz, M. L., Jeronimo, J. M., Leese, M. R., Lopez-Jimenez, A. C., and Altobelli, N.

Abstract

Context. During the period between 15 September 2014 and 4 February 2015, the Rosetta spacecraft accomplished the circular orbit phase around the nucleus of comet 67P/Churyumov-Gerasimenko (67P). The Grain Impact Analyzer and Dust Accumulator (GIADA) onboard Rosetta monitored the 67P coma dust environment for the entire period. Aims. We aim to describe the dust spatial distribution in the coma of comet 67P by means of in situ measurements. We determine dynamical and physical properties of cometary dust particles to support the study of the production process and dust environment modification. Methods. We analyzed GIADA data with respect to the observation geometry and heliocentric distance to describe the coma dust spatial distribution of 67P, to monitor its activity, and to retrieve information on active areas present on its nucleus. We combined GIADA detection information with calibration activity to distinguish different types of particles that populate the coma of 67P: compact particles and fluffy porous aggregates. By means of particle dynamical parameters measured by GIADA, we studied the dust acceleration region. Results. GIADA was able to distinguish different types of particles populating the coma of 67P: compact particles and fluffy porous aggregates. Most of the compact particle detections occurred at latitudes and longitudes where the spacecraft was in view of the comet’s neck region of the nucleus, the so-called Hapi region. This resulted in an oscillation of the compact particle abundance with respect to the spacecraft position and a global increase as the comet moved from 3.36 to 2.43 AU heliocentric distance. The speed of these particles, having masses from 10-10 to 10-7 kg, ranged from 0.3 to 12.2 m s−1. The variation of particle mass and speed distribution with respect to the distance from the nucleus gave indications of the dust acceleration region. The influen

Catalog

Books, media, physical & digital resources
See catalog results