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|Title:||Evidence of energy-, recombination-, and photon-limited escape regimes in giant planet H/He atmospheres|
López Puertas, M.
Sánchez López, A.
Lara, L. M.
Sanz Forcada, J.
Caballero, J. A.
Amado, P. J.
|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|
|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.|
|Appears in Collections:||(CAB) Artículos|
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