Oxidation of the Interiors of Carbide Exoplanets

Allen-Sutter, H.; Garhart, E.; Leinenweber, K.; Prakapenka, V.; Greenberg, E.; Shim, S. -H.

doi:10.3847/psj/abaa3e

Oxidation of the Interiors of Carbide Exoplanets

Journal Article · Wed Aug 26 00:00:00 EDT 2020 · The Planetary Science Journal

DOI:https://doi.org/10.3847/psj/abaa3e· OSTI ID:1736298

^[1]; Garhart, E. ^[1]; Leinenweber, K. ^[1]; Prakapenka, V. ^[2]; Greenberg, E. ^[2]; ^[1]

Arizona State Univ., Tempe, AZ (United States)
Univ. of Chicago, IL (United States)

Astrophysical measurements have shown that some stars have sufficiently high carbon-to-oxygen ratios such that the planets they host would be mainly composed of carbides instead of silicates. We studied the behavior of silicon carbide in the presence of water under the high pressure–temperature conditions relevant to planetary interiors in the laser-heated diamond-anvil cell. When reacting with water, silicon carbide converts to silica (stishovite) and diamond at pressures up to 50 GPa and temperatures up to 2500 K: $$\mathrm{SiC}+2{{\rm{H}}}_{2}{\rm{O}}\to {\mathrm{SiO}}_{2}+{\rm{C}}+2{{\rm{H}}}_{2}$$. Therefore, if water can be incorporated into carbide planets during their formation or through later delivery, they could be oxidized and have mineralogy dominated by silicates and diamond in their interiors. The reaction could produce CH₄ at shallower depths and H₂ at greater depths that could be degassed from the interior, causing the atmospheres of the converted carbon planets to be rich in reducing gases. Excess water after the reaction can be stored in dense silica polymorphs in the interiors of the converted carbon planets. Such conversion of mineralogy to diamond and silicates would decrease the density of carbon-rich planet, making the converted planets distinct from silicate planets in mass–radius relations for the 2–8 Earth mass range.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

Sponsoring Organization:: National Aeronautic and Space Administration (NASA); National Science Foundation (NSF); USDOE Office of Science (SC)

Grant/Contract Number:: AC02-06CH11357; FG02-94ER14466

OSTI ID:: 1736298

Journal Information:: The Planetary Science Journal, Journal Name: The Planetary Science Journal Journal Issue: 2 Vol. 1; ISSN 2632-3338

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: ENGLISH

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