Summer fireworks on comet 67P

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题名:	Summer fireworks on comet 67P
作者:	林忠義;Vincent, J.-B.;A'Hearn, M. F.;Lin, Z.-Y.;El-Maarry, M. R.;Pajola, M.;Sierks, H.;Barbieri, C.;Lamy, P. L.;Rodrigo, R.;Koschny, D.;Rickman, H.;Keller, H. U.;Agarwal, J.;Barucci, M. A.;Bertaux, J.-L.;Bertini, I.;Besse, S.;Bodewits, D.;Cremonese, G.;Da Deppo, V.;Davidsson, B.;Debei, S.;De Cecco, M.;Deller, J.;Fornasier, S.;Fulle, M.;Gicquel, A.;Groussin, O.;Gutiérrez, P. J.;Gutiérrez-Marquez, P.;Güttler, C.;Höfner, S.;Hofmann, M.;Hviid, S. F.;Ip, W.-H.;Jorda, L.;Knollenberg, J.;Kovacs, G.;Kramm, J.-R.;Kührt, E.;Küppers, M.;Lara, L. M.;Lazzarin, M.;Lopez Moreno, J. J.;Marzari, F.;Massironi, M.;Mottola, S.;Naletto, G.;Oklay, N.;Preusker, F.;Scholten, F.;Shi, X.;Thomas, N.;Toth, I.;Tubiana, C.
贡献者:	理學院天文研究所
关键词:	Astrophysics;comets: individual: 67P/Churyumov-Gerasimenko;Sciences of the Universe
日期:	2016-11-01
上传时间:	2026-04-21 14:58:31 (UTC+8)
出版者:	Oxford University Press;Oxford University Press (OUP): Policy P - Oxford Open Option A
摘要:	摘要： During its two years mission around comet 67P/Churyumov-Gerasimenko, ESA's Rosetta spacecraft had the unique opportunity to follow closely a comet in the most active part of its orbit. Many studies have presented the typical features associated to the activity of the nucleus, such as localized dust and gas jets. Here we report on series of more energetic transient events observed during the three months surrounding the comet's perihelion passage in August 2015. We detected and characterized 34 outbursts with the Rosetta cameras, one every 2.4 nucleus rotation. We identified 3 main dust plume morphologies associated to these events: a narrow jet, a broad fan, and more complex plumes featuring both previous types together. These plumes are comparable in scale and temporal variation to what has been observed on other comets. We present a map of the outbursts source locations, and discuss the associated topography. We find that the spatial distribution sources on the nucleus correlates well with morphological region boundaries, especially in areas marked by steep scarps or cliffs. Outbursts occur either in the early morning or shortly after the local noon, indicating two potential processes: Morning outbursts may be triggered by thermal stresses linked to the rapid change of temperature; afternoon events are most likely related to the diurnal or seasonal heat wave reaching volatiles buried under the first surface layer. In addition, we propose that some events can be the result of a completely different mechanism, in which most of the dust is released upon the collapse of a cliff. 出版者： Oxford University Press (OUP): Policy P - Oxford Open Option A 出版日期： 2016-11-01 出處： Monthly notices of the Royal Astronomical Society, 2016-11, Vol.462 (Suppl 1), p.S184-S194 資源來源： Alma/SFX Local Collection 版權： CC0 1.0 - Universal 識別號： ISSN: 0035-8711 識別號： ISSN: 1365-2966 識別號： ISSN: 1365-8711 識別號： EISSN: 1365-2966 識別號： DOI: 10.1093/mnras/stw2409
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