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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, Th; Nortmann, L.; Amado, P. J.; Montes, D.; Reiners, A.; Ribas, I.
Astronomy and astrophysics (Berlin), 04/2021, Volume: 648Journal Article
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 Ly α 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.
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