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redox hysteresis of super earth exoplanets from magma ocean circulation

Name: Redox hysteresis of super-Earth exoplanets from magma ocean circulation
Creator: Lichtenberg, T
Keywords: Physics - Geophysics, Earth and Planetary Astrophysics (astro-ph.EP), Physics - Atmospheric and Oceanic Physics, 13. Climate action, Atmospheric and Oceanic Physics (physics.ao-ph), 0103 physical sciences, FOS: Physical sciences, 01 natural sciences, Astrophysics - Earth and Planetary Astrophysics, Geophysics (physics.geo-ph)

descriptionPublicationkeyboard_double_arrow_right Other literature type , Presentation , Article , Preprint 01 Jun 2021Embargo end date: 01 Jan 2021 United Kingdom Publisher:Copernicus GmbHJournal:The Astrophysical Journal Letters, volume 914, page L4 (issn: 2041-8205, eissn: 2041-8213,

Authors: Lichtenberg, T;

redox hysteresis of super earth exoplanets from magma ocean circulation

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Abstract

Internal redox reactions may irreversibly alter the mantle composition and volatile inventory of terrestrial and super-Earth exoplanets and affect the prospects for atmospheric observations. The global efficacy of these mechanisms, however, hinges on the transfer of reduced iron from the molten silicate mantle to the metal core. Scaling analysis indicates that turbulent diffusion in the internal magma oceans of sub- Neptunes can kinetically entrain liquid iron droplets and quench core formation. This suggests that the chemical equilibration between core, mantle, and atmosphere may be energetically limited by convective overturn in the magma flow. Hence, molten super-Earths possibly retain a compositional memory of their accretion path. Redox control by magma ocean circulation is positively correlated with planetary heat flow, internal gravity, and planet size. The presence and speciation of remanent atmospheres, surface mineralogy, and core mass fraction of atmosphere-stripped exoplanets may thus constrain magma ocean dynamics.

Country

United Kingdom

Related Organizations

University of Oxford
United Kingdom
University of Oxford
United Kingdom

Keywords

Physics - Geophysics, Earth and Planetary Astrophysics (astro-ph.EP), Physics - Atmospheric and Oceanic Physics, Atmospheric and Oceanic Physics (physics.ao-ph), FOS: Physical sciences, Astrophysics - Earth and Planetary Astrophysics, Geophysics (physics.geo-ph)

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