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Origin of the ices agglomerated by Comet 67P/Churyumov-Gerasimenko

Abstract : The nature of the icy material accreted by comets during their formation in the outer regions of the protosolar nebula is a major open question in planetary science. Some scenarios of comet formation predict that these bodies agglomerated from clathrates crystallized in the protosolar nebula. Concurrently, alternative scenarios suggest that comets accreted amorphous ice originating from the interstellar cloud. Here we show that the recent N2/CO and Ar/CO ratios measured in the coma of the Jupiter family comet 67P/Churyumov-Gerasimenko by the ROSINA instrument aboard the European Space Agency's Rosetta spacecraft can help disentangling between these two scenarios.
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https://hal-insu.archives-ouvertes.fr/insu-03580899
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Submitted on : Friday, February 18, 2022 - 6:48:53 PM
Last modification on : Tuesday, March 1, 2022 - 10:18:55 AM

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Olivier Mousis, Jonathan I. Lunine, Adrienn Luspay-Kuti, Tristan Guillot, Bernard Marty, et al.. Origin of the ices agglomerated by Comet 67P/Churyumov-Gerasimenko. DPS 47 Annual Meeting for Division for Planetary Sciences, American Astronomical Society, Nov 2015, Washington, United States. p.2644-2652. ⟨insu-03580899⟩

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