67P/Churyumov-Gerasimenko, a Jupiter family comet with a high D/H ratio
67P/Churyumov-Gerasimenko, a Jupiter family comet with a high D/H ratio
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DOI：
10.1126/science.1261952
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发表时间：
2015-01-23
期刊：
影响因子：
56.9
通讯作者：
Wurz, P.
中科院分区：
文献类型：
--
作者：
Altwegg, K.;Balsiger, H.;Wurz, P.
关于地球和其他类地行星上水和有机化合物的来源，人们讨论了很长一段时间，但没有达成共识。区分不同情况的最好方法之一是确定彗星和地球海洋储存库中的重氢比(D/H)。在这里，我们报道了用欧洲航天局Rosetta航天器上的ROSINA质谱仪直接原位测量木星家族彗星67P/Churyumov-Gerasimenko的D/H比，其大小为(5.3+/-0.7)x 10(-4)，约为地球值的三倍。之前的彗星测量和我们的新发现表明，木星家族物体内的水中存在广泛的D/H比，排除了这个水库完全由地球海洋般的水组成的想法。
The provenance of water and organic compounds on Earth and other terrestrial planets has been discussed for a long time without reaching a consensus. One of the best means to distinguish between different scenarios is by determining the deuterium-to-hydrogen (D/H) ratios in the reservoirs for comets and Earth's oceans. Here, we report the direct in situ measurement of the D/H ratio in the Jupiter family comet 67P/Churyumov-Gerasimenko by the ROSINA mass spectrometer aboard the European Space Agency's Rosetta spacecraft, which is found to be (5.3 +/- 0.7) x 10(-4)-that is, approximately three times the terrestrial value. Previous cometary measurements and our new finding suggest a wide range of D/H ratios in the water within Jupiter family objects and preclude the idea that this reservoir is solely composed of Earth ocean-like water.