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Elemental and molecular abundances in comet 67P/Churyumov-Gerasimenko

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Rubin Martin, Altwegg Kathrin, Balsiger Hans, Berthelier Jean-Jacques, Combi Michael R, De Keyser Johan, Drozdovskaya Maria, Fiethe Björn, Fuselier Stephen A, Gasc Sébastien, Gombosi Tamas I, Hänni Nora, Hansen Kenneth C, Mall Urs, Rème Henri, Schroeder Isaac R H G, Schuhmann Markus, Sémon Thierry, Waite Jack H, Wampfler Susanne F, Wurz Peter,
Project Investigation of the Solar System with in situ Mass Spectrometry
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Original article (peer-reviewed)

Journal Monthly Notices of the Royal Astronomical Society
Volume (Issue) 489(1)
Page(s) 594 - 607
Title of proceedings Monthly Notices of the Royal Astronomical Society
DOI 10.1093/mnras/stz2086

Open Access

URL https://boris.unibe.ch/132688/
Type of Open Access Repository (Green Open Access)

Abstract

ABSTRACTComets are considered to be some of the most pristine and unprocessed Solar system objects accessible to in situ exploration. Investigating their molecular and elemental composition takes us on a journey back to the early period of our Solar system and possibly even further. In this work, we deduce the bulk abundances of the major volatile species in comet 67P/Churyumov-Gerasimenko, the target of the European Space Agency’s (ESA) Rosetta mission. The basis are measurements obtained with the ROSINA instrument suite on board the Rosetta orbiter during a suitable period of high outgassing near perihelion. The results are combined with both gas and dust composition measurements published in the literature. This provides an integrated inventory of the major elements present in the nucleus of 67P/Churyumov-Gerasimenko. Similar to comet 1P/Halley, which was visited by ESA’s Giotto spacecraft in 1986, comet 67P/Churyumov-Gerasimenko also shows near-solar abundances of oxygen and carbon, whereas hydrogen and nitrogen are depleted compared to solar. Still, the degree of devolatilization is lower than that of inner Solar system objects, including meteorites and the Earth. This supports the idea that comets are amongst the most pristine objects in our Solar system.
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