2004A&A...418L...1L


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.02CEST14:26:03

2004A&A...418L...1L - Astronomy and Astrophysics, volume 418, L1-4 (2004/4-4)

Atmospheric escape from hot Jupiters.

LECAVELIER DES ETANGS A., VIDAL-MADJAR A., McCONNELL J.C. and HEBRARD G.

Abstract (from CDS):

The extra-solar planet HD209458b has been found to have an extended atmosphere of escaping atomic hydrogen (Vidal-Madjar et al., 2003, in press, astro-ph/0312384), suggesting that ``hot Jupiters'' closer to their parent stars could evaporate. Here we estimate the atmospheric escape (so called evaporation rate) from hot Jupiters and their corresponding life time against evaporation. The calculated evaporation rate of HD209458b is in excellent agreement with the HI Lyman-α observations. We find that the tidal forces and high temperatures in the upper atmosphere must be taken into account to obtain reliable estimate of the atmospheric escape. Because of the tidal forces, we show that there is a new escape mechanism at intermediate temperatures at which the exobase reaches the Roche lobe. From an energy balance, we can estimate plausible values for the planetary exospheric temperatures, and thus obtain typical life times of planets as a function of their mass and orbital distance.

Abstract Copyright:

Journal keyword(s): star: individual: HD 209458 - stars: planetary systems

Simbad objects: 3

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Number of rows : 3

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME OGLE-TR-56b Pl 17 56 35.5015759807 -29 32 21.476706712           ~ 191 1
2 HD 209458 V* 22 03 10.7729598762 +18 53 03.548248479   8.21 7.63     F9V 994 1
3 HD 209458b Pl 22 03 10.7729598762 +18 53 03.548248479           ~ 1468 1

    Equat.    Gal    SGal    Ecl

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2020.07.02-14:26:03

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