Issue |
A&A
Volume 654, October 2021
|
|
---|---|---|
Article Number | A73 | |
Number of page(s) | 13 | |
Section | Planets and planetary systems | |
DOI | https://doi.org/10.1051/0004-6361/202040100 | |
Published online | 13 October 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
1
Instituto de Astrofísica de Canarias,
Vía Láctea s/n,
38205
La Laguna,
Tenerife,
Spain
e-mail: mstangret@iac.es
2
Departamento de Astrofísica, Universidad de La Laguna,
38200
San Cristobal de La Laguna,
Spain
3
Leiden Observatory, Leiden University,
Postbus 9513,
2300
RA Leiden,
The Netherlands
4
National Space Institute, Technical University of Denmark,
Elektrovej,
2800
Kgs. Lyngby,
Denmark
5
INAF – Osservatorio Astronomico di Padova,
Vicolo dell’Osservatorio 5,
35122
Padova,
Italy
6
Institut für Astrophysik, Georg-August-Universität,
Friedrich-Hund-Platz 1,
37077
Göttingen,
Germany
7
INAF – Osservatorio Astrofisico di Catania,
Via Santa Sofia 78,
95123
Catania,
Italy
8
Department of Physics and Astronomy, Università degli Studi di Padova,
Vicolo dell’Osservatorio 3,
35122
Padova,
Italy
9
University of Southern Queensland, Centre for Astrophysics,
USQ Toowoomba,
West Street,
QLD 4350,
Australia
10
INAF – Osservatorio Astrofisico di Torino,
via Osservatorio 20,
10025
Pino Torinese,
Italy
11
INAF – Osservatorio Astronomico di Brera,
Via E. Bianchi 46,
23807
Merate,
Italy
12
Yale University,
52 Hillhouse Avenue,
New Haven,
CT
06511,
USA
13
Fundación Galileo Galilei - INAF,
Rambla José Ana Fernandez Pérez 7,
38712
Breña Baja,
TF,
Spain
Received:
9
December
2020
Accepted:
12
April
2021
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.
Key words: planets and satellites: individual: TOI-1431b / planets and satellites: individual: MASCARA-5b / planets and satellites: atmospheres / techniques: spectroscopic
© ESO 2021
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