DENSITY AND CHARGE OF PRISTINE FLUFFY PARTICLES FROM COMET 67P/CHURYUMOV–GERASIMENKO
| Autor: | Nicolas Altobelli, J. M. Jeronimo, Martin Hilchenbach, Philippe Lamy, Sihane Merouane, F. Lucarelli, M. Herranz, Mark Leese, Bo Å. S. Gustafson, M. Cosi, Stavro Ivanovski, Eberhard Grün, Vito Mennella, Jose Luis Ortiz, M. Ferrari, V. V. Zakharov, A. Lopez-Jimenez, Ernesto Palomba, Paul R. Weissman, Alessandra Rotundi, Roberto Sordini, Luigi Colangeli, R. Morales, J. E. Rodriguez, A. Molina, Mario Accolla, Francesca Esposito, V. Della Corte, Rafael Rodrigo, F. Giovane, J. A. M. McDonnell, J. J. López-Moreno, E. Mazzotta Epifani, Marco Fulle, John C. Zarnecki, Antal Juhász, F. Moreno, Pasquale Palumbo, E. Bussoletti, Simon F. Green, Karoly Szego |
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| Přispěvatelé: | INAF - Osservatorio Astronomico di Trieste (OAT), Istituto Nazionale di Astrofisica (INAF), Universita degli studi di Napoli 'Parthenope' [Napoli], Planetary Science Institute [Tucson] (PSI), Institute of Astronomy [Cambridge], University of Cambridge [UK] (CAM), Wigner Research Centre for Physics [Budapest], Hungarian Academy of Sciences (MTA), Laboratoire d'Astrophysique de Marseille (LAM), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Aix Marseille Université (AMU)-Centre National d'Études Spatiales [Toulouse] (CNES), INAF - Osservatorio Astronomico di Capodimonte (OAC), INAF - Osservatorio Astrofisico di Catania (OACT), Max-Planck-Institut für Sonnensystemforschung (MPS), Max-Planck-Gesellschaft, Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Département d'Astrophysique (ex SAP) (DAP), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, European Space Research and Technology Centre (ESTEC), European Space Agency (ESA), Istituto di Astrofisica e Planetologia Spaziali - INAF (IAPS), Max-Planck-Institut für Kernphysik (MPIK), British Geological Survey [Edinburgh], British Geological Survey (BGS), Centro de Astrobiologia [Madrid] (CAB), Instituto Nacional de Técnica Aeroespacial (INTA)-Consejo Superior de Investigaciones Científicas [Madrid] (CSIC), Leonardo, Virginia Polytechnic Institute and State University [Blacksburg], University of the Basque Country/Euskal Herriko Unibertsitatea (UPV/EHU), School of Physical Sciences [Milton Keynes], Faculty of Science, Technology, Engineering and Mathematics [Milton Keynes], The Open University [Milton Keynes] (OU)-The Open University [Milton Keynes] (OU), European Space Astronomy Centre (ESAC), Università degli Studi di Napoli 'Parthenope' = University of Naples (PARTHENOPE), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), Max-Planck-Institut für Sonnensystemforschung = Max Planck Institute for Solar System Research (MPS), Agence Spatiale Européenne = European Space Agency (ESA) |
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Physics
[PHYS]Physics [physics] Brightness individual (67P/Churyumov-Gerasimenko) - space vehicles Comet Astronomy Astronomy and Astrophysics Coma (optics) general - comets Astrophysics Bulk density 13. Climate action Space and Planetary Science instruments comets Negative potential Formation and evolution of the Solar System [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] Refractory (planetary science) ComputingMilieux_MISCELLANEOUS Cosmic dust |
| Zdroj: | The Astrophysical journal letters The Astrophysical journal letters, Bristol : IOP Publishing, 2015, 802 (1), pp.L12. ⟨10.1088/2041-8205/802/1/L12⟩ The Astrophysical journal letters, 2015, 802 (1), pp.L12. ⟨10.1088/2041-8205/802/1/L12⟩ |
| ISSN: | 2041-8205 2041-8213 |
| Popis: | 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 -3. These aggregates are charged, fragmented, and decelerated by the spacecraft negative potential and enter GIADA in showers of fragments at speeds -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%. |
| Databáze: | OpenAIRE |
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