The obliquity and atmosphere of the ultra-hot Jupiter TOI-1431b (MASCARA-5b): A misaligned orbit and no signs of atomic or molecular absorptions
2021 | journal article. A publication with affiliation to the University of Göttingen.
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The obliquity and atmosphere of the ultra-hot Jupiter TOI-1431b (MASCARA-5b): A misaligned orbit and no signs of atomic or molecular absorptions
Stangret, M.; Pallé, E.; Casasayas-Barris, N.; Oshagh, M. ; Bello-Arufe, A.; Luque, R. & Nascimbeni, V. et al. (2021)
Astronomy and Astrophysics, 654 pp. A73. DOI: https://doi.org/10.1051/0004-6361/202040100
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- Authors
- Stangret, M.; Pallé, E.; Casasayas-Barris, N.; Oshagh, Mahmoudreza ; Bello-Arufe, A.; Luque, R.; Nascimbeni, V.; Yan, F.; Orell-Miquel, J.; Sicilia, D.; Tronsgaard, R.
- Abstract
- Ultra-hot Jupiters are defined as giant planets with equilibrium temperatures larger than 2000 K. Most of them are found orbiting bright A-F type stars, making them extremely suitable objects to study their atmospheres using high-resolution spectroscopy. Recent studies show a variety of atoms and molecules detected in the atmospheres of this type of planets. Here we present our analysis of the newly discovered ultra-hot Jupiter TOI-1431 b/MASCARA-5 b, using two transit observations with the HARPS-N spectrograph and one transit observation with the EXPRES spectrograph. Analysis of the Rossiter-McLaughlin effect shows that the planet is in a polar orbit, with a projected obliquity λ = −155 −10 +20 degrees. Combining the nights and applying both cross-correlation methods and transmission spectroscopy, we find no evidences of Ca I , Fe I , Fe II , Mg I , Na I , V I , TiO, VO or H α in the atmosphere of the planet. Our most likely explanation for the lack of atmospheric features is the large surface gravity of the planet.
- Issue Date
- 2021
- Journal
- Astronomy and Astrophysics
- ISSN
- 0004-6361
- eISSN
- 1432-0746