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. and Palle, E. and Casasayas-Barris, N. and Oshagh, M. and Bello-Arufe, A. and Luque, R. and Nascimbeni, V. and Yan, F. and Orell-Miquel, J. and Sicilia, D. and Malavolta, L. and Addison, B. C. ORCID: https://orcid.org/0000-0003-3216-0626 and Buchhave, L. A. and Bonomo, A. S. and Borsa, F. and Cabot, S. H. C. and Cecconi, M. and Fischer, D. A. and Harutyunyan, A. and Mendonca, J. M. and Nowak, G. and Parviainen, H. and Sozzetti, A. and Tronsgaard, R. (2021) The obliquity and atmosphere of the ultra-hot Jupiter TOI-1431b (MASCARA-5b): A misaligned orbit and no signs of atomic or molecular absorptions. Astronomy and Astrophysics, 654:A73. pp. 1-13. ISSN 0004-6361


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.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Astrophysics (1 Aug 2018 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Astrophysics (1 Aug 2018 -)
Date Deposited: 17 Dec 2021 01:22
Last Modified: 22 Dec 2021 04:04
Uncontrolled Keywords: planets and satellites: individual: TOI-1431b; planets and; satellites: individual: MASCARA-5b; planets and satellites: atmospheres; techniques: spectroscopic; Astrophysics - Earth and Planetary; Astrophysics
Fields of Research (2008): 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Socio-Economic Objectives (2020): 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280120 Expanding knowledge in the physical sciences
Identification Number or DOI: https://doi.org/10.1051/0004-6361/202040100
URI: http://eprints.usq.edu.au/id/eprint/44810

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