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| 題名: | Subsurface properties and early activity of comet 67P/Churyumov-Gerasimenko |
| 作者: | 葉永烜;Gulkis, Samuel;Allen, Mark;von Allmen, Paul;Beaudin, Gerard;Biver, Nicolas;Bockelée-Morvan, Dominique;Choukroun, Mathieu;Crovisier, Jacques;Davidsson, Björn J. R.;Encrenaz, Pierre;Encrenaz, Therese;Frerking, Margaret;Hartogh, Paul;Hofstadter, Mark;Ip, Wing-Huen;Janssen, Michael;Jarchow, Christopher;Keihm, Stephen;Lee, Seungwon;Lellouch, Emmanuel;Leyrat, Cedric;Rezac, Ladislav;Schloerb, F. Peter;Spilker, Thomas |
| 貢獻者: | 理學院天文研究所 |
| 關鍵詞: | Astrophysics;Chemical elements;Comets;diurnal variation;Diurnal variations;Evolution;heat;Heat transfer;Heat transport;Ice;Microwaves;Necks;Periodic variations;Physics;Planetology;Spectra;Sublimation;temperature;Water vapor;Wavelengths |
| 日期: | 2015-01-23 |
| 上傳時間: | 2026-04-21 14:32:23 (UTC+8) |
| 出版者: | American Association for the Advancement of Science;Washington: American Association for the Advancement of Science (AAAS) |
| 摘要: | 摘要： Heat transport and ice sublimation in comets are interrelated processes reflecting properties acquired at the time of formation and during subsequent evolution. The Microwave Instrument on the Rosetta Orbiter (MIRO) acquired maps of the subsurface temperature of comet 67P/Churyumov-Gerasimenko, at 1.6 mm and 0.5 mm wavelengths, and spectra of water vapor. The total H2O production rate varied from 0.3 kg s–1in early June 2014 to 1.2 kg s–1in late August and showed periodic variations related to nucleus rotation and shape. Water outgassing was localized to the “neck” region of the comet. Subsurface temperatures showed seasonal and diurnal variations, which indicated that the submillimeter radiation originated at depths comparable to the diurnal thermal skin depth. A low thermal inertia (~10 to 50 J K–1m–2s–0.5), consistent with a thermally insulating powdered surface, is inferred.
出版者： Washington: American Association for the Advancement of Science (AAAS)
出版日期： 2015-01-23
出處： Science, 2015-01, Vol.347 (6220), p.aaa0709--aaa0709
資源來源： American Association for the Advancement of Science
版權： Copyright © 2015, 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.aaa0709
識別號： CODEN: SCIEAS |
| 顯示於類別: | [天文研究所] 期刊論文
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