Détail du document
Identifiant
oai:arXiv.org:2410.19381
Sujet
Astrophysics - Earth and Planetary...Auteur
Nail, F. MacLeod, M. Oklopčić, A. Gully-Santiago, M. Morley, C. V. Zhang, Z.Catégorie
sciences : astrophysique
Année
2024
Date de référencement
30/10/2024
Mots clés
planet planetaryRésumé
Recent observations of planetary atmospheres in HAT-P-32 b and HAT-P-67 b reveal extensive outflows reaching up to hundreds of planetary radii.
The helium 1083 nm light curves for these planets, captured across their full orbits, show notable asymmetries: both planets display more pronounced pre-transit than post-transit absorptions, with HAT-P-67 b being the more extreme case of that geometry.
Using three-dimensional (3D) hydrodynamic simulations, we identify key factors influencing the formation of a dense leading outflow stream and characterize its morphology.
Our models suggest that such a geometry of escaped material is caused by a relatively cold outflow of high mass-loss rate, launched preferentially from the planet's day side.
From the simulations we calculate synthetic He I 1083 nm spectra that show large absorption depths and irregular line profiles due to complex gas kinematics.
We find that the measurements of the He I 1083 nm equivalent width and the velocity shift relative to the planet's rest frame, observed over a significant portion of the planet's orbital phase, can provide important constraints on the outflow properties and its interaction with the stellar wind.
;Comment: 10 pages, 6 figures, 10.5281/zenodo.13988501
Nail, F.,MacLeod, M.,Oklopčić, A.,Gully-Santiago, M.,Morley, C. V.,Zhang, Z., 2024, Cold day-side winds shape large leading streams in evaporating exoplanet atmospheres
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