4.6 Article

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

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

  1. Swiss National Science Foundation (SNSF) in the frame of the National Centre for Competence in Research PlanetS
  2. European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme [724427, 679633]
  3. NASA's Science Mission directorate
  4. FONDECYT [3180063]
  5. NASA High-End Computing (HEC) Program through the NASA Advanced Supercomputing (NAS) Division at Ames Research Center

向作者/读者索取更多资源

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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