2021A&A...648L...7L

Query : 2021A&A...648L...7L

2021A&A...648L...7L - Astronomy and Astrophysics, volume 648L7-7 (2021/4-1)

Evidence of energy-, recombination-, and photon-limited escape regimes in giant planet H/He atmospheres.

LAMPON M., LOPEZ-PUERTAS M., CZESLA S., SANCHEZ-LOPEZ A., LARA L.M., SALZ M., SANZ-FORCADA J., MOLAVERDIKHANI K., QUIRRENBACH A., PALLE E., CABALLERO J.A., HENNING T., NORTMANN L., AMADO P.J., MONTES D., REINERS A. and RIBAS I.

Abstract (from CDS):

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 heliumI triplet at 10830Å 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.

Abstract Copyright: © ESO 2021

Journal keyword(s): 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

Simbad objects: 6

Full paper

View the references in ADS

Number of rows : 6

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2026	#notes
1	LP 424-4	PM*	07 59 05.8395356736	+15 23 29.236065000		13.5		11.934		M2.0V	172	1
2	NAME LP 424-4b	Pl	07 59 05.8395356736	+15 23 29.236065000						~	387	1
3	HD 189733b	Pl	20 00 43.7129433648	+22 42 39.073143456						~	1610	1
4	HD 189733	BY*	20 00 43.7129433648	+22 42 39.073143456	9.241	8.578	7.648	7.126	6.68	K2V	991	1
5	HD 209458b	Pl	22 03 10.7727465312	+18 53 03.549393384						~	2037	1
6	HD 209458	V*	22 03 10.7727465312	+18 53 03.549393384		8.21	7.63			F9V	1193	1

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