| Literature DB >> 28596364 |
B Marty1, K Altwegg2,3, H Balsiger2, A Bar-Nun4, D V Bekaert5, J-J Berthelier6, A Bieler2,7, C Briois8, U Calmonte2, M Combi7, J De Keyser9, B Fiethe10, S A Fuselier11, S Gasc2, T I Gombosi7, K C Hansen7, M Hässig2,11, A Jäckel2, E Kopp2, A Korth12, L Le Roy2, U Mall12, O Mousis13, T Owen14, H Rème15, M Rubin2, T Sémon2, C-Y Tzou2, J H Waite11, P Wurz2.
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.Entities:
Year: 2017 PMID： 28596364 DOI： 10.1126/science.aal3496
Source DB: PubMed Journal: Science ISSN： 0036-8075 Impact factor: 47.728