Origin of Molecular Oxygen in Comets: Current Knowledge and Perspectives |
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| Authors: | Adrienn Luspay-Kuti Olivier Mousis Jonathan I Lunine Yves Ellinger Françoise Pauzat Ujjwal Raut Alexis Bouquet Kathleen E Mandt Romain Maggiolo Thomas Ronnet Bastien Brugger Ozge Ozgurel Stephen A Fuselier |
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| Institution: | 1.Applied Physics Laboratory,Johns Hopkins University,Laurel,USA;2.Laboratoire d’Astrophysique de Marseille, UMR CNRS 7326,Aix-Marseille Université & OSU Pythéas,Marseille,France;3.Cornell Center for Astrophysics and Planetary Science,Cornell University,Ithaca,USA;4.CNRS, Laboratoire de Chimie Théorique, LCT,Sorbonne Université,Paris,France;5.Department of Space Research,Southwest Research Institute,San Antonio,USA;6.Department of Physics and Astronomy,University of Texas at San Antonio,San Antonio,USA;7.Royal Institute for Space Aeronomy,Brussels,Belgium;8.Division of Geological and Planetary Sciences,California Institute of Technology,Pasadena,USA |
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| Abstract: | The Rosetta Orbiter Spectrometer for Ion and Neutral Analysis (ROSINA) instrument onboard the Rosetta spacecraft has measured molecular oxygen (O2) in the coma of comet 67P/Churyumov-Gerasimenko (67P/C-G) in surprisingly high abundances. These measurements mark the first unequivocal detection of O2 in a cometary environment. The large relative abundance of O2 in 67P/C-G despite its high reactivity and low interstellar abundance poses a puzzle for its origin in comet 67P/C-G, and potentially other comets. Since its detection, there have been a number of hypotheses put forward to explain the production and origin of O2 in the comet. These hypotheses cover a wide range of possibilities from various in situ production mechanisms to protosolar nebula and primordial origins. Here, we review the O2 formation mechanisms from the literature, and provide a comprehensive summary of the current state of knowledge of the sources and origin of cometary O2. |
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