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Redox Hysteresis of Super-Earth Exoplanets from Magma Ocean Circulation

Authors: Lichtenberg, Tim;

Redox Hysteresis of Super-Earth Exoplanets from Magma Ocean Circulation

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.

Comment: Accepted for publication in ApJL; 7 pages, 2 figures; summaries available at http://bit.ly/Lichtenberg21blog (blog) and http://bit.ly/Lichtenberg21ApJLvideo (video)

Countries
Netherlands, United Kingdom
Related Organizations
Subjects by Vocabulary

Microsoft Academic Graph classification: Mantle (geology) Astrobiology Atmosphere chemistry.chemical_compound Convective overturn Physics Super-Earth Turbulent diffusion Accretion (meteorology) Silicate chemistry Magma

Keywords

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

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