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| 題名: | Large heterogeneities in comet 67P as revealed by active pits from sinkhole collapse |
| 作者: | 葉永烜;Vincent, Jean-Baptiste;Bodewits, Dennis;Besse, Sébastien;Sierks, Holger;Barbieri, Cesare;Lamy, Philippe;Rodrigo, Rafael;Koschny, Detlef;Rickman, Hans;Keller, Horst Uwe;Agarwal, Jessica;A'Hearn, Michael F.;Auger, Anne-Thérèse;Barucci, M. Antonella;Bertaux, Jean-Loup;Bertini, Ivano;Capanna, Claire;Cremonese, Gabriele;Da Deppo, Vania;Davidsson, Björn;Debei, Stefano;De Cecco, Mariolino;El-Maarry, Mohamed Ramy;Ferri, Francesca;Fornasier, Sonia;Fulle, Marco;Gaskell, Robert;Giacomini, Lorenza;Groussin, Olivier;Guilbert-Lepoutre, Aurélie;Gutierrez-Marques, P.;Gutiérrez, Pedro J.;Güttler, Carsten;Hoekzema, Nick;Höfner, Sebastian;Hviid, Stubbe F.;Ip, Wing-Huen;Jorda, Laurent;Knollenberg, Jörg;Kovacs, Gabor;Kramm, Rainer;Kührt, Ekkehard;Küppers, Michael;La Forgia, Fiorangela;Lara, Luisa M.;Lazzarin, Monica;Lee, Vicky;Leyrat, Cédric;Lin, Zhong-Yi;Lopez Moreno, Josè J.;Lowry, Stephen;Magrin, Sara;Maquet, Lucie;Marchi, Simone;Marzari, Francesco;Massironi, Matteo;Michalik, Harald;Moissl, Richard;Mottola, Stefano;Naletto, Giampiero;Oklay, Nilda;Pajola, Maurizio;Preusker, Frank;Scholten, Frank;Thomas, Nicolas;Toth, Imre;Tubiana, Cecilia |
| 貢獻者: | 理學院天文研究所 |
| 關鍵詞: | 639/33/445/848;Astrophysics;Comets;Earth and Planetary Astrophysics;Holes;Humanities and Social Sciences;letter;Morphology;multidisciplinary;Natural history;Observations;Science;Sciences of the Universe;Sinkholes;Space exploration;Spacecraft;Spatial distribution;Sublimation |
| 日期: | 2015-07-01 |
| 上傳時間: | 2026-04-21 14:37:04 (UTC+8) |
| 出版者: | Nature Publishing Group;London: Nature Publishing Group UK |
| 摘要: | 摘要： The size and spatial distribution of pits on comet 67P/Churyumov–Gerasimenko, which are active and probably created by a sinkhole process, imply that large heterogeneities exist in the physical, structural or compositional properties of the first few hundred metres below the current cometary surface. A pit stop for Rosetta Using data from the OSIRIS camera onboard ESA's Rosetta probe, Jean-Baptiste Vincent et al . have been able to examine cometary pits — a surface feature detected on many cometary nuclei — with unprecedented spatial resolution and with varying viewing geometries. The pits on comet 67P/Churyumov–Gerasimenko are shown to be active and probably created by a sinkhole process. The authors propose that after formation, the pits expand slowly in diameter with sublimation-driven retreat of the walls. The size and spatial distribution of pits implies large heterogeneities in physical, structural or compositional properties of the first few hundred metres below the current surface. Pits have been observed on many cometary nuclei mapped by spacecraft 1 , 2 , 3 , 4 . It has been argued that cometary pits are a signature of endogenic activity, rather than impact craters such as those on planetary and asteroid surfaces. Impact experiments 5 , 6 and models 7 , 8 cannot reproduce the shapes of most of the observed cometary pits, and the predicted collision rates imply that few of the pits are related to impacts 8 , 9 . Alternative mechanisms like explosive activity 10 have been suggested, but the driving process remains unknown. Here we report that pits on comet 67P/Churyumov–Gerasimenko are active, and probably created by a sinkhole process, possibly accompanied by outbursts. We argue that after formation, pits expand slowly in diameter, owing to sublimation-driven retreat of the walls. Therefore, pits characterize how eroded the surface is: a fresh cometary surface will have a ragged structure with many pits, while an evolved surface will look smoother. The size and spatial distribution of pits imply that large heterogeneities exist in the physical, structural or compositional properties of the first few hundred metres below the current nucleus surface.
其他題名： Nature
出版者： London: Nature Publishing Group UK
出版日期： 2015-07-02
出處： Nature (London), 2015-07, Vol.523 (7558), p.63-66
資源來源： SpringerLink Journals
版權： Springer Nature Limited 2015
版權： COPYRIGHT 2015 Nature Publishing Group
版權： Copyright Nature Publishing Group Jul 2, 2015
版權： CC0 1.0 - Universal
識別號： ISSN: 0028-0836
識別號： ISSN: 1476-4687
識別號： EISSN: 1476-4687
識別號： DOI: 10.1038/nature14564
識別號： PMID: 26135448
識別號： CODEN: NATUAS |
| 顯示於類別: | [天文研究所] 期刊論文
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