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.; Yan, F.; Orell-Miquel, J.; Sicilia, D.; Malavolta, L.; Addison, B. C.; Buchhave, L. A.; Bonomo, A. S.; Borsa, F.; Cabot, S. H. C.; Cecconi, M.; Fischer, D. A.; Harutyunyan, A.; Mendonça, J. M.; Nowak, G.; Parviainen, H.; Sozzetti, A.; Tronsgaard, R.
Bibliographical reference

Astronomy and Astrophysics

Advertised on:
10
2021
Number of authors
24
IAC number of authors
8
Citations
14
Refereed citations
10
Description
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.
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