Rubin Martin, Altwegg Kathrin, Balsiger Hans, Bar-Nun Akiva, Berthelier Jean-Jacques, Briois Christelle, Calmonte Ursina, Combi Michael, De Keyser Johan, Fiethe Björn, Fuselier Stephen A, Gasc Sebastien, Gombosi Tamas I, Hansen Kenneth C, Kopp Ernest, Korth Axel, Laufer Diana, Le Roy Léna, Mall Urs, Marty Bernard, Mousis Olivier, Owen Tobias, Rème Henri, Sémon Thierry, Tzou Chia-Yu, Waite Jack H, Wurz Peter
Physikalisches Institut, University of Bern, Sidlerstrasse 5, CH-3012 Bern, Switzerland.
Center for Space and Habitability, University of Bern, Gesellschaftsstrasse 6, CH-3012 Bern, Switzerland.
Sci Adv. 2018 Jul 4;4(7):eaar6297. doi: 10.1126/sciadv.aar6297. eCollection 2018 Jul.
The Rosetta Orbiter Spectrometer for Ion and Neutral Analysis mass spectrometer Double Focusing Mass Spectrometer on board the European Space Agency's Rosetta spacecraft detected the major isotopes of the noble gases argon, krypton, and xenon in the coma of comet 67P/Churyumov-Gerasimenko. Earlier, it was found that xenon exhibits an isotopic composition distinct from anywhere else in the solar system. However, argon isotopes, within error, were shown to be consistent with solar isotope abundances. This discrepancy suggested an additional exotic component of xenon in comet 67P/Churyumov-Gerasimenko. We show that krypton also exhibits an isotopic composition close to solar. Furthermore, we found the argon to krypton and the krypton to xenon ratios in the comet to be lower than solar, which is a necessity to postulate an addition of exotic xenon in the comet.
欧洲航天局“罗塞塔”号航天器搭载的“罗塞塔轨道器离子与中性分析光谱仪”双聚焦质谱仪，在67P/丘留莫夫－格拉西缅科彗星的彗发中探测到了惰性气体氩、氪和氙的主要同位素。此前发现，氙的同位素组成与太阳系其他任何地方都不同。然而，氩同位素在误差范围内与太阳同位素丰度一致。这种差异表明，67P/丘留莫夫－格拉西缅科彗星中存在额外的外来氙成分。我们发现，氪的同位素组成也接近太阳。此外，我们发现该彗星中氩与氪以及氪与氙的比率低于太阳比率，这是假定该彗星中存在外来氙添加成分的必要条件。
