Detection of neutral atomic species in the ultra-hot Jupiter WASP-121b
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Abstract
The class of ultra-hot Jupiters comprises giant exoplanets undergoing intense
irradiation from their host stars. They have proved to be a particularly
interesting population for their orbital and atmospheric properties. One such
planet, WASP-121~b, is in a highly misaligned orbit close to its Roche limit,
and its atmosphere exhibits a thermal inversion. These properties make
WASP-121~b an interesting target for additional atmospheric characterization.
In this paper, we present analysis of archival high-resolution optical spectra
obtained during transits of WASP-121~b. Artifacts from the Rossiter-McLaughlin
effect and Center-to-Limb Variation are deemed negligible. However, we discuss
scenarios where these effects warrant more careful treatment by modeling the
WASP-121 system and varying its properties. We report a new detection of
atmospheric absorption from H
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1365-2966