Star-planet interaction through spectral lines

C. Villarreal D'Angelo, A. A. Vidotto, A. Esquivel, M. A. Sgró, T. Koskinen, L. Fossati, C. Villarreal D'Angelo, A. A. Vidotto, A. Esquivel, M. A. Sgró, T. Koskinen, L. Fossati

Research output: Contribution to journalArticlepeer-review


The growth of spectroscopic observations of exoplanetary systems allows the possibility of testing theoretical models and studying the interaction that exoplanetary atmospheres have with the wind and the energetic photons from the star. In this work, we present a set of numerical 3D simulations of HD 209458b for which spectral lines observations of their evaporative atmosphere are available. The different simulations aim to reproduce different scenarios for the star-planet interaction. With our models, we reconstruct the Lyα line during transit and compare with observations. The results allows us to analyse the shape of the line profile under these different scenarios and the comparison with the observations suggest that HD209458b may have a magnetic field off less than 1 G. We also explore the behaviour of the magnesium lines for models with and without magnetic fields.

Original languageEnglish (US)
Pages (from-to)280-285
Number of pages6
JournalProceedings of the International Astronomical Union
StateAccepted/In press - 2020


  • HD209458
  • line: Profiles
  • magnetic fields
  • methods: Numerical
  • outflows
  • stars: Individual
  • stars: Planetary systems
  • stars: Winds

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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