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

Bourrier, V.; Kitzmann, D.; Kuntzer, T.; Nascimbeni, V.; Lendl, M.; Lavie, B.; Hoeijmakers, H. J.; Pino, L.; Ehrenreich, D.; Heng, K.; Allart, R.; Cegla, H. M; Dumusque, X.; Melo, C.; Astudillo-Defru, N.; Caldwell, D. A.; Cretignier, M.; Giles, H.; Henze, C. E.; Jenkins, J.; ... (2020). Optical phase curve of the ultra-hot Jupiter WASP-121b. Astronomy and astrophysics, 637(A36), A36. EDP Sciences 10.1051/0004-6361/201936647

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We present the analysis of TESS optical photometry of WASP-121b, which reveal the phase curve of this transiting ultra-hot Jupiter. Its hotspot is located at the substellar point, showing inefficient heat transport from the dayside (2870 K) to the nightside (< 2200 K) 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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