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http://hdl.handle.net/20.500.12386/23646| Title: | Density and Charge of Pristine Fluffy Particles from Comet 67P/Churyumov-Gerasimenko | Authors: | FULLE, Marco DELLA CORTE, VINCENZO Rotundi, Alessandra Weissman, P. Juhasz, A. Szego, K. Sordini, R. FERRARI, MARCO IVANOVSKI, STAVRO LAMBROV Lucarelli, F. Accolla, M. Merouane, S. Zakharov, V. Mazzotta Epifani, E. López-Moreno, J. J. Rodríguez, J. COLANGELI, Luigi Palumbo, P. Grün, E. Hilchenbach, M. Bussoletti, E. ESPOSITO, Francesca Green, S. F. Lamy, P. L. McDonnell, J. A. M. MENNELLA, Vito Molina, A. Morales, R. Moreno, F. Ortiz, J. L. PALOMBA, Ernesto 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. |
Issue Date: | 2015 | Journal: | THE ASTROPHYSICAL JOURNAL | Number: | 802 | Issue: | 1 | First Page: | L12 | 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 \lt 1 kg m<SUP>-3</SUP>. These aggregates are charged, fragmented, and decelerated by the spacecraft negative potential and enter GIADA in showers of fragments at speeds \lt 1 m s<SUP>-1</SUP>. 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%. | Acknowledgments: | GIADA was built by a consortium led by the Univ. Napoli Parthenope INAF-Oss. Astr. Capodimonte in collaboration with the Inst. de Astrofisica de Andalucia, Selex-ES, FI, and SENER. GIADA is presently managed operated by Ist. di Astrofisica e Planetologia Spaziali-INAF, IT. GIADA was funded and managed by the Agenzia Spaziale Italiana, IT, with the support of the Spanish Ministry of Education and Science MEC, ES. GIADA was developed from a PI proposal from the University of Kent; Sci. Tech. contribution were provided by CISAS, IT, Lab. d’Astr. Spat., FR, and Institutions from UK, IT, FR, DE, and USA. Science support was provided by NASA through the US Rosetta Project managed by the Jet Propulsion Laboratory/California Institute of Technology. GIADA calibrated data will be available through ESA’s PSA website ( www.rssd.esa.int/index.php?project=PSApage=index ). We would like to thank Angioletta Coradini for her contribution as a GIADA Co-I. We thank the Rosetta Science Ground Segment at ESAC, the Rosetta Mission Operations Centre at ESOC and the Rosetta Project at ESTEC for their outstanding work enabling the science return of the Rosetta Mission. We thank the referee, G.J. Flynn, for having greatly improved the manuscript. | URI: | http://hdl.handle.net/20.500.12386/23646 | URL: | https://iopscience.iop.org/article/10.1088/2041-8205/802/1/L12 | ISSN: | 0004-637X | DOI: | 10.1088/2041-8205/802/1/L12 | Bibcode ADS: | 2015ApJ...802L..12F | Fulltext: | open |
| Appears in Collections: | 1.01 Articoli in rivista |
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| Fulle_2015_ApJL_802_L12.pdf | PDF editoriale | 202.54 kB | Adobe PDF | View/Open |
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