The organic-rich surface of comet 67P/Churyumov-Gerasimenko as seen by VIRTIS/Rosetta

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题名:	The organic-rich surface of comet 67P/Churyumov-Gerasimenko as seen by VIRTIS/Rosetta
作者:	葉永烜;Capaccioni, F.;Coradini, A.;Filacchione, G.;Erard, S.;Arnold, G.;Drossart, P.;De Sanctis, M. C.;Bockelee-Morvan, D.;Capria, M. T.;Tosi, F.;Leyrat, C.;Schmitt, B.;Quirico, E.;Cerroni, P.;Mennella, V.;Raponi, A.;Ciarniello, M.;McCord, T.;Moroz, L.;Palomba, E.;Ammannito, E.;Barucci, M. A.;Bellucci, G.;Benkhoff, J.;Bibring, J. P.;Blanco, A.;Blecka, M.;Carlson, R.;Carsenty, U.;Colangeli, L.;Combes, M.;Combi, M.;Crovisier, J.;Encrenaz, T.;Federico, C.;Fink, U.;Fonti, S.;Ip, W. H.;Irwin, P.;Jaumann, R.;Kuehrt, E.;Langevin, Y.;Magni, G.;Mottola, S.;Orofino, V.;Palumbo, P.;Piccioni, G.;Schade, U.;Taylor, F.;Tiphene, D.;Tozzi, G. P.;Beck, P.;Biver, N.;Bonal, L.;Combe, J.-Ph;Despan, D.;Flamini, E.;Fornasier, S.;Frigeri, A.;Grassi, D.;Gudipati, M.;Longobardo, A.;Markus, K.;Merlin, F.;Orosei, R.;Rinaldi, G.;Stephan, K.;Cartacci, M.;Cicchetti, A.;Giuppi, S.;Hello, Y.;Henry, F.;Jacquinod, S.;Noschese, R.;Peter, G.;Politi, R.;Reess, J. M.;Semery, A.
贡献者:	理學院天文研究所
关键词:	Absorption;Albedo;Astrophysics;Chemical compounds;Comet nuclei;Comets;Hydrogen;image analysis;Micrometers;minerals;Physics;Planetology;reflectance;Slopes;Spacecraft;Spectra;Spectrometers;Surface chemistry
日期:	2015-01-23
上传时间:	2026-04-21 14:32:37 (UTC+8)
出版者:	American Association for the Advancement of Science;Washington: American Association for the Advancement of Science (AAAS)
摘要:	摘要： The VIRTIS (Visible, Infrared and Thermal Imaging Spectrometer) instrument on board the Rosetta spacecraft has provided evidence of carbon-bearing compounds on the nucleus of the comet 67P/Churyumov-Gerasimenko. The very low reflectance of the nucleus (normal albedo of 0.060 ± 0.003 at 0.55 micrometers), the spectral slopes in visible and infrared ranges (5 to 25 and 1.5 to 5% kÅ−1), and the broad absorption feature in the 2.9-to-3.6–micrometer range present across the entire illuminated surface are compatible with opaque minerals associated with nonvolatile organic macromolecular materials: a complex mixture of various types of carbon-hydrogen and/or oxygen-hydrogen chemical groups, with little contribution of nitrogen-hydrogen groups. In active areas, the changes in spectral slope and absorption feature width may suggest small amounts of water-ice. However, no ice-rich patches are observed, indicating a generally dehydrated nature for the surface currently illuminated by the Sun. 出版者： Washington: American Association for the Advancement of Science (AAAS) 出版日期： 2015-01-23 出處： Science, 2015-01, Vol.347 (6220), p.aaa0628--aaa0628 資源來源： American Association for the Advancement of Science 版權： Copyright © 2015, American Association for the Advancement of Science 版權： CC0 1.0 - Universal 識別號： ISSN: 0036-8075 識別號： ISSN: 1095-9203 識別號： EISSN: 1095-9203 識別號： DOI: 10.1126/science.aaa0628 識別號： CODEN: SCIEAS
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