Optical phase curve of the ultra-hot Jupiter WASP-121b
Journal
Date Issued
2020
Author(s)
Bourrier, V.
•
Kitzmann, D.
•
Kuntzer, T.
•
•
Lendl, M.
•
Lavie, B.
•
Hoeijmakers, H. J.
•
•
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.
•
Lovis, C.
•
Murgas, F.
•
Pepe, F.
•
Ricker, G. R.
•
Rose, M. E.
•
Seager, S.
•
Segransan, D.
•
Suárez-Mascareño, A.
•
Udry, S.
•
Vanderspek, R.
•
Wyttenbach, A.
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.
The reduced light curve of WASP-121, phase-folded at the planet orbital period and binned (Fig. 2) is available at the CDS via anonymous ftp to http://cdsarc.u-strasbg.fr (ftp://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/637/A36
Volume
637
Start page
A36
Issn Identifier
0004-6361
Ads BibCode
2020A&A...637A..36B
Rights
open.access
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