Influence of stellar radiation pressure on flow structure in the envelope of hot-Jupiter HD 209458b

Abstract Close-in exoplanets are subjected to extreme radiation of their host stars. Photometric observations of the hot-Jupiter HD 209458b transit by HST/STIS detected strong absorption in the Ly α line, thus indicating the existence of a hydrogen envelope extending beyond the Roche lobe. The gasdy...

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Bibliographic Details
Published in:Monthly notices of the Royal Astronomical Society 2018-03, Vol.475 (1), p.605-613
Main Authors: Cherenkov, A A, Bisikalo, D V, Kosovichev, A G
Format: Article
Language:English
Subjects:
Computer simulation
Dynamic stability
Extrasolar planets
Photometry
Pressure effects
Radiation
Radiation pressure
Stellar radiation
Stellar winds
Wind pressure
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Summary:Abstract Close-in exoplanets are subjected to extreme radiation of their host stars. Photometric observations of the hot-Jupiter HD 209458b transit by HST/STIS detected strong absorption in the Ly α line, thus indicating the existence of a hydrogen envelope extending beyond the Roche lobe. The gasdynamic modelling (Bisikalo et al.) showed that the stable structure of this envelope is maintained by the balance between the Roche lobe overfilling and stellar wind pressure. Obviously, the dynamics and stability of the envelope can be affected by stellar radiation pressure. Using 3D gasdynamic simulations, we study the impact of radiation pressure in the Ly α line on the envelope of hot-Jupiter HD 209458b, and show that the effect is not strong enough to significantly affect the gasdynamics in the system. For a detectable radiation pressure effect the intensity of the Ly α line has to be by two orders of magnitude greater.
ISSN:0035-8711
1365-2966
DOI:10.1093/mnras/stx3230