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Hans Publishers, Astronomy & Astrophysics, (637), p. A36, 2020

DOI: 10.1051/0004-6361/201936647

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

Journal article published in 2020 by V. Bourrier, D. Kitzmann, T. Kuntzer, V. Nascimbeni ORCID, M. Lendl, B. Lavie, H. J. Hoeijmakers, L. Pino ORCID, D. Ehrenreich, K. Heng, R. Allart, H. M. Cegla, X. Dumusque, C. Melo, N. Astudillo-Defru and other authors.
This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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Abstract

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.