Evidence of energy-, recombination-, and photon-limited escape regimes in giant planet H/He atmospheres
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...
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| Hauptverfasser: | , , , , , , , , , , , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
23 April 2021
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| In: |
Astronomy and astrophysics
Year: 2021, Jahrgang: 648, Pages: 1-9 |
| ISSN: | 1432-0746 |
| DOI: | 10.1051/0004-6361/202140423 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1051/0004-6361/202140423 Verlag, lizenzpflichtig, Volltext: https://www.aanda.org/articles/aa/abs/2021/04/aa40423-21/aa40423-21.html 
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| Verfasserangaben: | M. Lampón, M. López-Puertas, S. Czesla, A. Sánchez-López, L. M. Lara, M. Salz, J. Sanz-Forcada, K. Molaverdikhani, A. Quirrenbach, E. Pallé, J.A. Caballero, Th. Henning, L. Nortmann, P.J. Amado, D. Montes, A. Reiners, and I. Ribas |
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| 245 | 1 | 0 | |a Evidence of energy-, recombination-, and photon-limited escape regimes in giant planet H/He atmospheres |c M. Lampón, M. López-Puertas, S. Czesla, A. Sánchez-López, L. M. Lara, M. Salz, J. Sanz-Forcada, K. Molaverdikhani, A. Quirrenbach, E. Pallé, J.A. Caballero, Th. Henning, L. Nortmann, P.J. Amado, D. Montes, A. Reiners, and I. Ribas |
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| 520 | |a 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<i>α<i/> 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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