A precise metallicity and carbon-to-oxygen ratio for a warm giant exoplanet from its panchromatic JWST emission spectrum.

ABSTRACT: WASP-80 b, a warm sub-Jovian (equilibrium temperature [Formula: see text]820 K, 0.5 Jupiter masses), presents an opportunity to characterize a rare gas giant exoplanet around a low-mass star. In addition, its moderate temperature enables its atmosphere to host a range of carbon and oxygen species (H₂O, CH₄, CO, CO₂, NH₃). In this paper, we present a panchromatic emission spectrum of WASP-80 b, the first gas giant around a late K/early M-dwarf star and the coolest planet for which the James Webb Space Telescope has obtained a complete emission spectrum spanning 2.4 to 12 [Formula: see text]m, including NIRCam F322W2 (2.4 to 4 [Formula: see text]m) and F444W (4 to 5 [Formula: see text]m), and MIRI LRS (5 to 12 [Formula: see text]m). We report confi

SUBMITTER: Wiser LS 

PROVIDER: S-EPMC12501160 | biostudies-literature | 2025 Sep

REPOSITORIES: biostudies-literature