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.

中文翻译：

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彗星67P / Churyumov-Gerasimenko昏迷时的rypto同位素和稀有气体丰度。

欧洲航天局罗塞塔号航天器上的用于离子和中性分析的罗塞塔轨道质谱仪和双聚焦质谱仪在67P / Churyumov-Gerasimenko彗星昏迷中检测到了稀有气体氩，k和氙的主要同位素。早先发现，氙气的同位素组成不同于太阳系中的其他任何地方。但是，氩同位素在误差范围内被证明与太阳同位素丰度一致。这种差异表明彗星67P / Churyumov-Gerasimenko中还含有氙气的其他奇异成分。我们表明k也表现出接近太阳的同位素组成。此外，我们发现彗星中的氩与k的比率以及to与氙的比率均低于太阳，