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Oxidation of the Interiors of Carbide Exoplanets
The Planetary Science Journal Pub Date : 2020-08-25 , DOI: 10.3847/psj/abaa3e
H. Allen-Sutter 1 , E. Garhart 1 , K. Leinenweber 2 , V. Prakapenka 3 , E. Greenberg 3 , S.-H. Shim 1
Affiliation  

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: ##IMG## [http://ej.iop.org/images/2632-3338/1/2/39/psjabaa3eieqn1.gif] {$\mathrm{SiC}+2{{\rm{H}}}_{2}{\rm{O}}\to {\mathrm{SiO}}_{2}+{\rm{C}}+2{{\rm{H}}}_{2}$} . 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 CH 4 at shallower depths and H 2 ...

中文翻译:

碳化物系外行星内部的氧化

天体物理测量表明,某些恒星具有足够高的碳氧比,因此它们所拥有的行星将主要由碳化物而不是硅酸盐组成。我们研究了在激光加热的金刚石-砧室中与行星内部相关的高压-高温条件下,在水存在下碳化硅的行为。与水反应时,碳化硅在高达50 GPa的压力和高达2500 K的温度下会转化为二氧化硅(水滑石)和金刚石:## IMG ## [http://ej.iop.org/images/2632-3338/ 1/2/39 / psjabaa3eieqn1.gif] {$ \ mathrm {SiC} +2 {{\ rm {H}}} _ {2} {\ rm {O}} \到{\ mathrm {SiO}} __ 2} + {\ rm {C}} + 2 {{\ rm {H}}} _ {2} $}。因此,如果在碳化物行星的形成过程中或以后的输送过程中将水混入其中,它们可能会被氧化,并在其内部以硅酸盐和钻石为主。反应可能在较浅的深度产生H 4和H 2 ...
更新日期:2020-08-31
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