No thick carbon dioxide atmosphere on the rocky exoplanet TRAPPIST-1 c.

ABSTRACT: Seven rocky planets orbit the nearby dwarf star TRAPPIST-1, providing a unique opportunity to search for atmospheres on small planets outside the Solar System¹. Thanks to the recent launch of the James Webb Space Telescope (JWST), possible atmospheric constituents such as carbon dioxide (CO₂) are now detectable^2,3. Recent JWST observations of the innermost planet TRAPPIST-1 b showed that it is most probably a bare rock without any CO₂ in its atmosphere⁴. Here we report the detection of thermal emission from the dayside of TRAPPIST-1 c with the Mid-Infrared Instrument (MIRI) on JWST at 15 µm. We measure a planet-to-star flux ratio of f_p/f_⁎ = 421 ± 94 parts per million (ppm), which corresponds to an inferred dayside

SUBMITTER: Zieba S 

PROVIDER: S-EPMC10447244 | biostudies-literature | 2023 Aug

REPOSITORIES: biostudies-literature