Rosetta's comet 67P/Churyumov- Gerasimenko sheds its dusty mantle to reveal its icy nature

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题名:	Rosetta's comet 67P/Churyumov- Gerasimenko sheds its dusty mantle to reveal its icy nature
作者:	葉永烜;Fornasier, S.;Mottola, S.;Keller, H. U.;Barucci, M. A.;Davidsson, B.;Feller, C.;Deshapriya, J. D. P.;Sierks, H.;Barbieri, C.;Lamy, P. L.;Rodrigo, R.;Koschny, D.;Rickman, H.;A'Hearn, M.;Agarwal, J.;Bertaux, J.-L.;Bertini, I.;Besse, S.;Cremonese, G.;Da Deppo, V.;Debei, S.;De Cecco, M.;Deller, J.;EI-Maarry, M. R.;Fulle, M.;Groussin, O.;Gutierrez, P. J.;Güttler, C.;Hofmann, M.;Hviid, S. F.;Ip, W.-H.;Jorda, L.;Knollenberg, J.;Kovacs, G.;Kramm, R.;Kührt, E.;Küppers, M.;Lara, M. L.;Lazzarin, M.;Moreno, J. J. Lopez;Marzari, F.;Massironi, M.;Naletto, G.;Oklay, N.;Pajola, M.;Pommerol, A.;Preusker, F.;Scholten, F.;Shi, X.;Thomas, N.;Toth, I.;Tubiana, C.;Vincent, J.-B.
贡献者:	理學院天文研究所
关键词:	Astrophysics;Carbon dioxide;Comet nuclei;Comets;Dust;Ice;Mathematical models;Perihelions;Physics;Planetology;Rosetta mission;Sciences of the Universe;Shadows;Spacecraft;Sublimation;Surface chemistry
日期:	2016-12-23
上传时间:	2026-04-21 15:00:30 (UTC+8)
出版者:	American Association for the Advancement of Science;United States: American Association for the Advancement of Science (AAAS)
摘要:	摘要： Rosetta observes sublimating surface icesComets are “dirty snowballs” made of ice and dust, but they are dark because the ice sublimates away, leaving some of the dust behind on the surface. The Rosetta spacecraft has provided a close-up view of the comet 67P/Churyumov-Gerasimenko as it passes through its closest point to the Sun (see the Perspective by Dello Russo). Filacchioneet al.detected the spectral signature of solid CO2(dry ice) in small patches on the surface of the nucleus as they emerged from local winter. By modeling how the CO2sublimates, they constrain the composition of comets and how ices generate the gaseous coma and tail. Fornasieret al.studied images of the comet and discovered bright patches on the surface where ice was exposed, which disappeared as the ice sublimated. They also saw frost emerging from receding shadows. The surface of the comet was noticeably less red just after local dawn, indicating that icy material is removed by sunlight during the local day.Science, this issue p.<jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6319" page="1563" related-article-type="in-this-issue" vol="354" xlink:href="10.1126/science.aag3161">1563</jats:related-article>, p.<jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6319" page="1566" related-article-type="in-this-issue" vol="354" xlink:href="10.1126/science.aag2671">1566</jats:related-article>; see also p.<jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6319" page="1536" related-article-type="in-this-issue" vol="354" xlink:href="10.1126/science.aal1964">1536</jats:related-article> 其他題名： Science 出版者： United States: American Association for the Advancement of Science (AAAS) 出版日期： 2016-12-23 出處： Science, 2016-12, Vol.354 (6319), p.1566-1570 資源來源： American Association for the Advancement of Science 版權： Copyright © 2016 American Association for the Advancement of Science 版權： Copyright © 2016, American Association for the Advancement of Science. 版權： Copyright © 2016, American Association for the Advancement of Science 版權： licence_http://creativecommons.org/publicdomain/zero 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.aag2671 識別號： PMID: 27856849 識別號： CODEN: SCIEAS
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