期刊
ASTRONOMY & ASTROPHYSICS
卷 637, 期 -, 页码 -出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201936647
关键词
planetary systems; planets and satellites: individual: WASP-121b; planets and satellites: atmospheres; techniques: photometric
资金
- Swiss National Science Foundation (SNSF) in the frame of the National Centre for Competence in Research PlanetS
- European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme [724427, 679633]
- NASA's Science Mission directorate
- FONDECYT [3180063]
- NASA High-End Computing (HEC) Program through the NASA Advanced Supercomputing (NAS) Division at Ames Research Center
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 3) 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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