The 0.8-4.5 μm Broadband Transmission Spectra of TRAPPIST-1 Planets
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Abstract
The TRAPPIST-1 planetary system represents an exceptional opportunity for the
atmospheric characterization of temperate terrestrial exoplanets with the
upcoming James Webb Space Telescope (JWST). Assessing the potential impact of
stellar contamination on the planets' transit transmission spectra is an
essential precursor step to this characterization. Planetary transits
themselves can be used to scan the stellar photosphere and to constrain its
heterogeneity through transit depth variations in time and wavelength. In this
context, we present our analysis of 169 transits observed in the optical from
space with K2 and from the ground with the SPECULOOS and Liverpool telescopes.
Combining our measured transit depths with literature results gathered in the
mid/near-IR with Spitzer/IRAC and HST/WFC3, we construct the broadband
transmission spectra of the TRAPPIST-1 planets over the 0.8-4.5
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1538-3881