Tenuous outgassed H2O and CO2 atmospheres on TRAPPIST-1 planets are possible at 10^-4 to 1 bar and match JWST transmission data, with potential habitability on d and e.
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LIFE can constrain atmospheric H2O abundances from roughly 10^{-3} to 1 bar surface pressure on Earth-like exoplanets for certain vertical profiles, providing a potential proxy for surface oceans, but cannot detect water below 10^{-6} bar or precisely characterize the highest abundances.
citing papers explorer
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Coupled Photochemical-Climate Modeling of Plausible Tenuous Outgassed Atmospheres on the TRAPPIST-1 Planets
Tenuous outgassed H2O and CO2 atmospheres on TRAPPIST-1 planets are possible at 10^-4 to 1 bar and match JWST transmission data, with potential habitability on d and e.
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The Goldilocks problem for detecting water in terrestrial planets: Constraining water abundances in the mid-IR with LIFE
LIFE can constrain atmospheric H2O abundances from roughly 10^{-3} to 1 bar surface pressure on Earth-like exoplanets for certain vertical profiles, providing a potential proxy for surface oceans, but cannot detect water below 10^{-6} bar or precisely characterize the highest abundances.