Distribution of water around the nucleus of comet 67P/Churyumov-Gerasimenko at 3.4 AU from the Sun as seen by the MIRO instrument on Rosetta

被引：59

作者：

Biver, N. ^{[1
]}

Hofstadter, M. ^{[2
]}

Gulkis, S. ^{[2
]}

Bockelee-Morvan, D. ^{[1
]}

Choukroun, M. ^{[2
]}

Lellouch, F. ^{[1
]}

Schloerb, F. P. ^{[3
]}

Rezac, L. ^{[4
]}

Ip, W. H. ^{[5
]}

Jarchow, C. ^{[4
]}

Hartogh, P. ^{[4
]}

Lee, S. ^{[2
]}

von Allmen, P. ^{[2
]}

Crovisier, J. ^{[1
]}

Leyrat, C. ^{[1
]}

Encrenaz, P. ^{[6
]}

机构：

[1] Univ Paris Diderot, LESIA, Observ Paris, CNRS,UPMC, F-92195 Meudon, France

[2] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA

[3] Univ Massachusetts, Amherst, MA 01003 USA

[4] Max Planck Inst Sonnensyst Forsch, D-37077 Gottingen, Germany

[5] Natl Cent Univ, Taoyuan 32001, Taiwan

[6] UPMC, CNRS, LERMA, Observ Paris,PSL Res Univ, F-75014 Paris, France

来源：

ASTRONOMY & ASTROPHYSICS | 2015年 / 583卷

基金：

美国国家航空航天局;

关键词：

comets: individual: 67P/Churyumov-Gerasimenko; radio lines: planetary systems; submillimeter: planetary systems; comets: general;

D O I：

10.1051/0004-6361/201526094

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The Microwave Instrument on the Rosetta Orbiter (MIRO) has been observing the coma of comet 67P/ Churyumov-Gerasimenko almost continuously since June 2014 at wavelengths near 0.53 mm. We present here a map of the water column density in the inner coma (within 3 km from nucleus center) when the comet was at 3.4 AU from the Sun. Based on the analysis of the (H2O)-O-16 and (H2O)-O-18 (110-101) lines, we find that the column density can vary by two orders of magnitude in this region. The highest column density is observed in a narrow region on the dayside, close to the neck and north pole rotation axis of the nucleus, while the lowest column density is seen against the nightside of the nucleus where outgassing seems to be very low. We estimate that the outgassing pattern can be represented by a Gaussian distribution in a solid angle with FWHM approximate to 80 degrees.

引用

页数：7

共 16 条

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