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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: Lampón, Manuel (VerfasserIn) , López-Puertas, M. (VerfasserIn) , Czesla, Stefan (VerfasserIn) , Sánchez López, Alejandro (VerfasserIn) , Lara, L. M. (VerfasserIn) , Salz, M. (VerfasserIn) , Sanz-Forcada, J. (VerfasserIn) , Molaverdikhani, Karan (VerfasserIn) , Quirrenbach, Andreas (VerfasserIn) , Pallé, E. (VerfasserIn) , Caballero, José A. (VerfasserIn) , Henning, Thomas (VerfasserIn) , Nortmann, Lisa (VerfasserIn) , Amado, P. J. (VerfasserIn) , Montes, D. (VerfasserIn) , Reiners, Ansgar (VerfasserIn) , Ribas, Ignasi (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 23 April 2021
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
Volltext
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
Beschreibung
Zusammenfassung: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.
Beschreibung:Gesehen am 16.06.2021
Beschreibung:Online Resource
ISSN:1432-0746
DOI:10.1051/0004-6361/202140423

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