D2O and HDS in the coma of 67P/Churyumov-Gerasimenko

被引：62
作者：
Altwegg, K. [1 ,2 ]
Balsiger, H. [1 ]
Berthelier, J. J. [3 ]
Bieler, A. [1 ,4 ]
Calmonte, U. [1 ]
De Keyser, J. [5 ]
Fiethe, B. [6 ]
Fuselier, S. A. [7 ]
Gasc, S. [1 ]
Gombosi, T. I. [3 ]
Owen, T. [8 ]
Le Roy, L. [1 ]
Rubin, M. [1 ]
Semon, T. [1 ]
Tzou, C. -Y. [1 ]
机构：
[1] Univ Bern, Phys Inst, Sidlerstr 5, CH-3012 Bern, Switzerland
[2] Univ Bern, Ctr Space & Habitabil, Sidlerstr 5, CH-3012 Bern, Switzerland
[3] LATMOS, 4 Ave Neptune, F-94100 St Maur, France
[4] Univ Michigan, Dept Atmospher Ocean & Space Sci, 2455 Hayward, Ann Arbor, MI 48109 USA
[5] Royal Belgian Inst Space Aeron BIRA IASB, Ringlaan 3, B-1180 Brussels, Belgium
[6] TU Braunschweig, Inst Comp & Network Engn IDA, Hans Sommer Str 66, D-38106 Braunschweig, Germany
[7] Southwest Res Inst, Space Sci Div, 6220 Culebra Rd, San Antonio, TX 78228 USA
[8] Univ Hawaii, Inst Astron, Honolulu, HI 96822 USA
来源：
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES | 2017年 / 375卷 / 2097期
基金：
瑞士国家科学基金会;
关键词：
67P/Churyumov-Gerasimenko; comets; deuterium; Rosetta; WATER DEUTERIUM FRACTIONATION; DEUTERATED WATER; OORT-CLOUD; INNER REGIONS; HDO/H2O RATIO; D/H; ABUNDANCE; SULFUR; MODELS; ROSINA;
D O I：
10.1098/rsta.2016.0253
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
The European Rosetta mission has been following comet 67P/Churyumov-Gerasimenko for 2 years, studying the nucleus and coma in great detail. For most of these 2 years the Rosetta Orbiter Sensor for Ion and Neutral Analysis (ROSINA) has analysed the volatile part of the coma. With its high mass resolution and sensitivity it was able to not only detect deuterated water HDO, but also doubly deuterated water, D2O and deuterated hydrogen sulfide HDS. The ratios for [HDO]/[H2O], [D2O]/[HDO] and [HDS]/[H2S] derived from our measurements are (1.05 +/- 0.14) x 10(-3), (1.80 +/- 0.9) x 10(-2) and (1.2 +/- 0.3) x 10(-3), respectively. These results yield a very high ratio of 17 for [D2O]/[HDO] relative to [HDO]/[H2O]. Statistically one would expect just 1/4. Such a high value can be explained by cometary water coming unprocessed from the presolar cloud, where water is formed on grains, leading to high deuterium fractionation. The high [HDS]/[H2S] ratio is compatible with upper limits determined in low-mass star-forming regions and also points to a direct correlation of cometary H2S with presolar grain surface chemistry. This article is part of the themed issue 'Cometary science after Rosetta'.
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页数：10
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