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Bean, Jonathan Lunine, Michael Line, Michael Zhang, Peter Smith, Prune C. August, Qiao Xue","submitted_at":"2023-05-12T20:38:15Z","abstract_excerpt":"We present the dayside thermal emission spectrum of WASP-77Ab from 2.8 -- 5.2 $\\mu$m as observed with the NIRSpec instrument on the James Webb Space Telescope (JWST). WASP-77Ab was previously found to have a sub-solar metallicity and a solar carbon-to-oxygen (C/O) ratio from H$_2$O and CO absorption lines detected using high-resolution spectroscopy. By performing atmospheric retrievals on the JWST spectrum assuming chemical equilibrium, we find a sub-solar metallicity [M/H]=$-0.91^{+0.24}_{-0.16}$ and C/O ratio $0.36^{+0.10}_{-0.09}$. 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