Subsurface properties and early activity of comet 67P/Churyumov-Gerasimenko

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题名:	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
贡献者:	理學院天文研究所
关键词:	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
上传时间:	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
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