MIRO observations of subsurface temperatures of the nucleus of 67P/Churyumov-Gerasimenko

NCU Institutional Repository > 理學院 > 天文研究所 > 期刊論文 > Item 987654321/101680

jsp.display-item.identifier=請使用永久網址來引用或連結此文件: https://ir.lib.ncu.edu.tw/handle/987654321/101680

题名:	MIRO observations of subsurface temperatures of the nucleus of 67P/Churyumov-Gerasimenko
作者:	葉永烜;Schloerb, F. Peter;Keihm, Stephen;von Allmen, Paul;Choukroun, Mathieu;Lellouch, Emmanuel;Leyrat, Cedric;Beaudin, Gerard;Biver, Nicolas;Bockelée-Morvan, Dominique;Crovisier, Jacques;Encrenaz, Pierre;Gaskell, Robert;Gulkis, Samuel;Hartogh, Paul;Hofstadter, Mark;Ip, Wing-Huen;Janssen, Michael;Jarchow, Christopher;Jorda, Laurent;Keller, Horst Uwe;Lee, Seungwon;Rezac, Ladislav;Sierks, Holger
贡献者:	理學院天文研究所
关键词:	Astronomy;Astrophysics;Brightness temperature;comets: general;comets: individual: 67P/Churyumov-Gerasimenko;Microwaves;Nuclei;Physical properties;Physics;radio continuum: planetary systems;Sciences of the Universe;Sublimation;Thermal emission;Wavelengths
日期:	2015-11-01
上传时间:	2026-04-21 14:40:42 (UTC+8)
出版者:	EDP Sciences
摘要:	摘要： Observations of the nucleus of 67P/Churyumov-Gerasimenko in the millimeter-wave continuum have been obtained by the Microwave Instrument for the Rosetta Orbiter (MIRO). We present data obtained at wavelengths of 0.5 mm and 1.6 mm during September 2014 when the nucleus was at heliocentric distances between 3.45 and 3.27 AU. The data are fit to simple models of the nucleus thermal emission in order to characterize the observed behavior and make quantitative estimates of important physical parameters, including thermal inertia and absorption properties at the MIRO wavelengths. MIRO brightness temperatures on the irregular surface of 67P are strongly affected by the local solar illumination conditions, and there is a strong latitudinal dependence of the mean brightness temperature as a result of the seasonal orientation of the comet’s rotation axis with respect to the Sun. The MIRO emission exhibits strong diurnal variations, which indicate that it arises from within the thermally varying layer in the upper centimeters of the surface. The data are quantitatively consistent with very low thermal inertia values, between 10–30 J K-1 m-2 s-1/2, with the 0.5 mm emission arising from 1 cm beneath the surface and the 1.6 mm emission from a depth of 4 cm. Although the data are generally consistent with simple, homogeneous models, it is difficult to match all of its features, suggesting that there may be some vertical structure within the upper few centimeters of the surface. The MIRO brightness temperatures at high northern latitudes are consistent with sublimation of ice playing an important role in setting the temperatures of these regions where, based on observations of gas and dust production, ice is known to be sublimating. 出版者： EDP Sciences 出版日期： 2015-11-01 出處： Astronomy & Astrophysics, 2015-11, Vol.583, p.A29- 資源來源： EDP Sciences 版權： licence_http://creativecommons.org/publicdomain/zero 識別號： ISSN: 0004-6361 識別號： ISSN: 1432-0746 識別號： EISSN: 1432-0746 識別號： DOI: 10.1051/0004-6361/201526152
显示于类别:	[天文研究所] 期刊論文

文件中的档案:

档案	描述	大小	格式	浏览次数
index.html		0Kb	HTML	25	检视/开启

在NCUIR中所有的数据项都受到原著作权保护.

社群 sharing

数据加载中.....