1. The obliquity and atmosphere of the ultra-hot Jupiter TOI-1431b (MASCARA-5b): A misaligned orbit and no signs of atomic ormolecular absorptions
- Author
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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., and Tronsgaard, R.
- Subjects
Astrophysics - Earth and Planetary Astrophysics - 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)
- Published
- 2021
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