Influence of stellar radiation pressure on flow structure in the envelope of hot-jupiter HD209458b

A. A. Cherenkov, D. V. Bisikalo, A. G. Kosovichev

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

Close-in exoplanets are subjected to extreme radiation of their host stars. Photometric observations of the hot-Jupiter HD209458b 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 HD209458b, 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.

Original languageEnglish (US)
Article numberstx3230
Pages (from-to)605-613
Number of pages9
JournalMonthly Notices of the Royal Astronomical Society
Volume475
Issue number1
DOIs
StatePublished - Mar 21 2018

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • Hydrodynamics
  • Methods: numerical
  • Planets and satellites: atmospheres

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