Extended Data Fig. 5: Emission and transmission spectra of TRAPPIST-1b.
From: No thick atmosphere around TRAPPIST-1 b and c from JWST thermal phase curves
Upper panel: Occultation depth measurements compared to models of TRAPPIST-1 b occultation depth spectra computed for five distinct GCM simulations along with a low albedo, airless planet case. Data points (in red) were taken from Greene et al. (2023) and Ducrot et al. (2024). The six spectra have been selected here for their good agreement with the observed occultations at 12.8 and 15 μm. Lower panel: Transit spectra computed for the TRAPPIST-1b atmospheric scenarios fitting all available infrared MIRI data points (0.01 bar N2 with 1 ppm of CO2 and Haze high cases). The transit spectrum has been offset by 103 ppm for the Haze high case so that the minimum value is zero. For comparison, we added the transmission spectrum from Lim et al. (2023), not corrected from stellar contamination, with an offset of 7150 ppm.
