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Title: Evidence of energy-, recombination-, and photon-limited escape regimes in giant planet H/He atmospheres
Authors: Lampón, M.
López Puertas, M.
Czesla, S.
Sánchez López, A.
Lara, L. M.
Salz, M.
Sanz Forcada, J.
Molaverdikhani, K.
Quirrenbach, A.
Pallé, E.
Caballero, J. A.
Henning, T.
Nortmann, L.
Amado, P. J.
Montes, D.
Reiners, A.
Ribas, I.
Keywords: Planets and satellites: atmospheres;Planets and satellites: gaseous planets;Planets and satellites: individual: GJ 3470 b;Planets and satellites: individual: HD 209458 b;Planets and satellites: individual: HD 189733 b
Issue Date: 23-Apr-2021
Publisher: EDP Sciences
DOI: 10.1051/0004-6361/202140423
Published version:
Citation: Astronomy and Astrophysics 648: L7(2021)
Abstract: Hydrodynamic escape is the most efficient atmospheric mechanism of planetary mass loss and has a large impact on planetary evolution. Three hydrodynamic escape regimes have been identified theoretically: energy-limited, recombination-limited, and photon-limited. However, no evidence of these regimes had been reported until now. Here, we report evidence of these three regimes via an analysis of a helium I triplet at 10 830 Å and Lyα absorption involving a 1D hydrodynamic model that allows us to estimate hydrogen recombination and advection rates. In particular, we show that HD 209458 b is in the energy-limited regime, HD 189733 b is in the recombination-limited regime, and GJ 3470 b is in the photon-limited regime. These exoplanets can be considered as benchmark cases for their respective regimes.
E-ISSN: 1432-0746
ISSN: 0004-6361
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