The obliquity and atmosphere of the ultra-hot Jupiter TOI-1431b (MASCARA-5b): A misaligned orbit and no signs of atomic or molecular absorptions

Journal
Date Issued
2021
Author(s)
Stangret, M.
•
Pallé, E.
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Casasayas-Barris, N.
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Oshagh, M.
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Bello-Arufe, A.
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Luque, R.
•
•
Yan, F.
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Orell-Miquel, J.
•
•
•
Addison, B. C.
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Buchhave, L. A.
•
•
•
Cabot, S. H. C.
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Cecconi, M.
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Fischer, D. A.
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Harutyunyan, A.
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Mendonça, J. M.
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Nowak, G.
•
Parviainen, H.
•
•
Tronsgaard, R.
DOI
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 Hα in the atmosphere of the planet. Our most likely explanation for the lack of atmospheric features is the large surface gravity of the planet.
Volume
654
Start page
A73
Uri
Url
Issn Identifier
0004-6361
Ads BibCode
2021A&A...654A..73S
Rights
open.access
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