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Optical phase curve of the ultra-hot Jupiter WASP-121b

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sword-2021-09-28T17:05:12.original.xml (130 B)
Original SWORD entry document
Date Issued
2020
Journal
Astronomy and Astrophysics
Publisher
EDP Sciences
Version
Final published version
Abstract
© ESO 2020. We present the analysis of TESS optical photometry of WASP-121b, which reveals the phase curve of this transiting ultra-hot Jupiter. Its hotspot is located at the sub-stellar point, showing inefficient heat transport from the dayside (2870 ± 50 K) to the nightside (<2500 K at 3σ) at the altitudes probed by TESS. The TESS eclipse depth, measured at the shortest wavelength to date for WASP-121b, confirms the strong deviation from blackbody planetary emission. Our atmospheric retrieval on the complete emission spectrum supports the presence of a temperature inversion, which can be explained by the presence of VO and possibly TiO and FeH. The strong planetary emission at short wavelengths could arise from an H- continuum.
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DOI of Published Version
10.1051/0004-6361/201936647
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