Xenon isotopes in 67P/Churyumov-Gerasimenko show that comets contributed to Earth's atmosphere

Abstract : The origin of cometary matter and the potential contribution of comets to inner-planet atmospheres are long-standing problems. During a series of dedicated low-altitude orbits, the Rosetta Orbiter Spectrometer for Ion and Neutral Analysis (ROSINA) on the Rosetta spacecraft analyzed the isotopes of xenon in the coma of comet 67P/Churyumov-Gerasimenko. The xenon isotopic composition shows deficits in heavy xenon isotopes and matches that of a primordial atmospheric component. The present-day Earth atmosphere contains 22 ± 5% cometary xenon, in addition to chondritic (or solar) xenon.
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Science, 2017, 356 (6342), pp.1069-1072. 〈10.1051/0004-6361/201730591〉
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https://hal-insu.archives-ouvertes.fr/insu-01670674
Contributeur : Nathalie Rouchon <>
Soumis le : jeudi 21 décembre 2017 - 15:30:37
Dernière modification le : vendredi 12 janvier 2018 - 14:34:10

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R. Hajra, Pierre Henri, Xavier Vallières, M. Galand, K. Héritier, et al.. Xenon isotopes in 67P/Churyumov-Gerasimenko show that comets contributed to Earth's atmosphere. Science, 2017, 356 (6342), pp.1069-1072. 〈10.1051/0004-6361/201730591〉. 〈insu-01670674〉

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