학술논문
The obliquity and atmosphere of the ultra-hot Jupiter TOI-1431b (MASCARA-5b): A misaligned orbit and no signs of atomic ormolecular absorptions
Document Type
Working Paper
Author
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.
Source
A&A 654, A73 (2021)
Subject
Language
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-1431b/MASCARA-5b, 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 $ \lambda = -155^{+20}_{-10}$ degrees. Combining the nights and applying both cross-correlation methods and transmission spectroscopy, we find no evidences of CaI, FeI, FeII, MgI, NaI, VI, TiO, VO or H$\alpha$ in the atmosphere of the planet. Our most likely explanation for the lack of atmospheric features is the large surface gravity of the planet.
Comment: Accepted for publication in A&A (14 pages, 13 figures)
Comment: Accepted for publication in A&A (14 pages, 13 figures)