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Keyword: CO2-rich atmosphere ×Clear all

2 claims from 1 paper

1. Physics and Astronomy › Stellar, planetary, and galactic studies

   Diversity of Low-mass Planet Atmospheres in the C–H–O–N–S–Cl System with Interior Dissolution, Nonideality, and Condensation: Application to TRAPPIST-1e and Sub-Neptunes

   Bower, Thompson, Hakim, Tian and Sossi · The Astrophysical Journal · 2025

   The authors built an open-source Python tool, Atmodeller, to model atmospheres of low-mass planets across magma ocean and cooling stages, applying it to TRAPPIST-1e-like planets and sub-Neptunes such as K2-18b.

   Unchecked2 claims
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   1. UncheckedIn simulations of TRAPPIST-1e-like planets, CO-dominated magma ocean atmospheres mostly cool into CO2-rich ones of a few hundred bar at 280 K.“For TRAPPIST-1e-like planets, our simulations indicate that CO-dominated atmospheres are prevalent during the magma ocean stage, which, upon isochemical cooling, predominantly evolve into CO2-rich atmospheres of a few hundred bar at 280 K.”
   2. UncheckedIn the paper's sub-Neptune models, atmospheres become methane-rich above about 3.5 GPa if H/C is near 100 times solar and oxygen availability is moderately reducing.“These effects conspire to produce CH4-rich sub-Neptune atmospheres for total pressures exceeding around 3.5 GPa, provided H/C is approximately 100x solar and fO2 moderately reducing (3 log10 units below the iron-wustite buffer).”