Simulated JWST retrievals with stellar contamination show CO2 on TRAPPIST-1f is detectable in 10+10 transits, CH4 needs about 50+50, and H2O is not detected in up to 100+100 transits.
Fauchez and Martin Turbet and Geronimo L
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Veiled in Starlight: Impacts of Stellar Contamination on Retrievals of TRAPPIST-1f's Atmospheric Composition
Simulated JWST retrievals with stellar contamination show CO2 on TRAPPIST-1f is detectable in 10+10 transits, CH4 needs about 50+50, and H2O is not detected in up to 100+100 transits.