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| 題名: | Sublimation of icy aggregates in the coma of comet 67p/churyumov-gerasimenko detected with the osiris cameras on board rosetta |
| 作者: | 林忠義;Gicquel, A.;Vincent, J.-B.;Agarwal, J.;A'Hearn, M. F.;Bertini, I.;Bodewits, D.;Sierks, H.;Lin, Z.-Y.;Barbieri, C.;Lamy, P. L.;Rodrigo, R.;Koschny, D.;Rickman, H.;Keller, H. U.;Barucci, M. A.;Bertaux, J.-L.;Besse, S.;Cremonese, G.;Da Deppo, V.;Davidsson, B.;Debei, S.;Deller, J.;De Cecco, M.;Frattin, E.;El-Maarry, M. R.;Fornasier, S.;Fulle, M.;Groussin, O.;Gutiérrez, P. J.;Gutiérrez-Marquez, P.;Güttler, C.;Höfner, S.;Hofmann, M.;Hu, X.;Hviid, S. F.;Ip, W.-H.;Jorda, L.;Knollenberg, J.;Kovacs, G.;Kramm, J.-R.;Kührt, E.;Küppers, M.;Lara, L. M.;Lazzarin, M.;Moreno, J. J. Lopez;Lowry, S.;Marzari, F.;Masoumzadeh, N.;Massironi, M.;Moreno, F.;Mottola, S.;Naletto, G.;Oklay, N.;Pajola, M.;Pommerol, A.;Preusker, F.;Scholten, F.;Shi, X.;Thomas, N.;Toth, I.;Tubiana, C. |
| 貢獻者: | 理學院天文研究所 |
| 關鍵詞: | Astrophysics;comets: individual: 67P/Churyumov-Gerasimenko;Earth and Planetary Astrophysics;methods: data analysis;methods: numerical;methods: observational;Sciences of the Universe |
| 日期: | 2016-01-01 |
| 上傳時間: | 2026-04-21 14:45:40 (UTC+8) |
| 出版者: | Oxford University Press;Oxford University Press (OUP): Policy P - Oxford Open Option A |
| 摘要: | 摘要： Beginning in March 2014, the OSIRIS (Optical, Spectroscopic, and Infrared Remote Imaging System) cameras began capturing images of the nucleus and coma (gas and dust) of comet 67P/Churyumov-Gerasimenko using both the wide angle camera (WAC) and the narrow angle camera (NAC). The many observations taken since July of 2014 have been used to study the morphology, location, and temporal variation of the comet’s dust jets. We analyzed the dust monitoring observations shortly after the southern vernal equinox on May 30 and 31, 2015 with the WAC at the heliocentric distance Rh = 1.53 AU, where it is possible to observe that the jet rotates with the nucleus. We found that the decline of brightness as a function of the distance of the jet is much steeper than the background coma, which is a first indication of sublimation. We adapted a model of sublimation of icy aggregates and studied the effect as a function of the physical properties of the aggregates (composition and size). The major finding of this article was that through the sublimation of the aggregates of dirty grains (radius a between 5μm and 50μm) we were able to completely reproduce the radial brightness profile of a jet beyond 4 km from the nucleus. To reproduce the data we needed to inject a number of aggregates between 8.5 × 1013 and 8.5 × 1010 for a = 5μm and 50μm respectively, or an initial mass of H2O ice around 22kg.
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.S57-S66
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： EISSN: 1365-2966
識別號： DOI: 10.1093/mnras/stw2117 |
| 顯示於類別: | [天文研究所] 期刊論文
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