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The Deep Oxygen Abundance in Solar System Giant Planets, with a New Derivation for Saturn

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Abstract

Deep elemental composition is a challenging measurement to achieve in the giant planets of the solar system. Yet, knowledge of the deep composition offers important insights in the internal structure of these planets, their evolutionary history and their formation scenarios. A key element whose deep abundance is difficult to obtain is oxygen, because of its propensity for being in condensed phases such as rocks and ices. In the atmospheres of the giant planets, oxygen is largely stored in water molecules that condense below the observable levels. At atmospheric levels that can be investigated with remote sensing, water abundance can modify the observed meteorology, and meteorological phenomena can distribute water through the atmosphere in complex ways that are not well understood and that encompass deeper portions of the atmosphere. The deep oxygen abundance provides constraints on the connection between atmosphere and interior and on the processes by which other elements were trapped, making its determination an important element to understand giant planets. In this paper, we review the current constraints on the deep oxygen abundance of the giant planets, as derived from observations and thermochemical models.

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Funding

T. Cavalié and O. Mousis acknowledge support from CNES and the Programme National de Planétologie (PNP) of CNRS/INSU. J. Lunine was supported by the Juno mission through a subcontract from the Southwest Research Institute. R. Hueso was suppported by Grant PID2019-109467GB-I00 funded by MCIN/AEI/10.13039/501100011033/ and by Grupos Gobierno Vasco IT1742-22. The project leading to this publication has received funding from the Excellence Initiative of Aix-Marseille Université–A*Midex, a French “Investissements d’Avenir program” AMX-21-IET-018. This research holds as part of the project FACOM (ANR-22-CE49-0005-01_ACT) and has benefited from a funding provided by l’Agence Nationale de la Recherche (ANR) under the Generic Call for Proposals 2022.

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Correspondence to Thibault Cavalié.

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Cavalié, T., Lunine, J., Mousis, O. et al. The Deep Oxygen Abundance in Solar System Giant Planets, with a New Derivation for Saturn. Space Sci Rev 220, 8 (2024). https://doi.org/10.1007/s11214-024-01045-6

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  • DOI: https://doi.org/10.1007/s11214-024-01045-6

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