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| 題名: | The global surface composition of 67P/Churyumov-Gerasimenko nucleus by Rosetta/VIRTIS. II) Diurnal and seasonal variability |
| 作者: | 葉永烜;Ciarniello, M.;Raponi, A.;Capaccioni, F.;Filacchione, G.;Tosi, F.;DeSanctis, M. C.;Kappel, D.;Rousseau, B.;Arnold, G.;Capria, M. T.;Barucci, M. A.;Quirico, E.;Longobardo, A.;Kuehrt, E.;Mottola, S.;Erard, S.;Bockelee-Morvan, D.;Leyrat, C.;Migliorini, A.;Zinzi, A.;Palomba, E.;Schmitt, B.;Piccioni, G.;Cerroni, P.;Ip, W.-H.;Rinaldi, G.;Salatti, M. |
| 貢獻者: | 理學院天文研究所 |
| 關鍵詞: | Astrophysics;Sciences of the Universe |
| 日期: | 2016-01-01 |
| 上傳時間: | 2026-04-21 14:46:39 (UTC+8) |
| 出版者: | Oxford University Press;Oxford University Press (OUP): Policy P - Oxford Open Option A |
| 摘要: | 摘要： VIRTIS-M observations of the nucleus of comet 67P/Churyumov-Gerasimenko acquired from 2014 August to 2015 May have been analysed to investigate surface temporal variability at both seasonal and diurnal scales. The measured reflectance spectra are studied by means of comet spectral indicators (CSI) such as slopes in the visible and infrared ranges, and 3.2 mum band area and band centre. CSI maps derived from data acquired at different heliocentric distances (from 3.62 to 1.72 au) along the inbound leg of the comet's orbit are used to infer surface water ice abundance. We measure a global scale enrichment of water ice from 2014 August to 2015 May across the body of the comet, along with variability at small spatial scale, possibly related with the local insolation conditions. Analysis of water ice diurnal variability is performed on 2014 August observations. Water ice appears at the border of receding shadows in the neck of the comet (Hapi), sublimating in less than 1 h, after exposure to sunlight. As similar variability is not observed in other regions of the comet, we interpreted this as the expression of a diurnal cycle of sublimation and re-condensation of water ice, triggered by sudden shadowing produced on the neck by the body and the head of the nucleus.
出版者： Oxford University Press (OUP): Policy P - Oxford Open Option A
出版日期： 2016-12-10
出處： Monthly notices of the Royal Astronomical Society, 2016-12, Vol.462 (Issue Suppl_1), p.stw3177
資源來源： Alma/SFX Local Collection
版權： licence_http://creativecommons.org/publicdomain/zero
識別號： ISSN: 0035-8711
識別號： ISSN: 1365-8711
識別號： ISSN: 1365-2966
識別號： EISSN: 1365-2966
識別號： DOI: 10.1093/mnras/stw3177 |
| 顯示於類別: | [天文研究所] 期刊論文
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