Publication details

Search for the Star-Planet Interaction



Year of publication 2012
Type Article in Proceedings
Conference From Interacting Binaries to Exoplanets: Essential Modeling Tools, Proceedings of the International Astronomical Union
MU Faculty or unit

Faculty of Science

Field Astronomy and astrophysics
Keywords CaIIK line; exolanet; star planet interaction
Description We analyse the chromospherical activity of stars with extrasolar planets and search for a possible correlation between the equivalent width of the core of the Ca II K line and orbital parameters of the planet. We found statistically significant evidence that the equivalent width of the Ca II K line reversal, which originates in the stellar chromosphere, depends on the orbital period Porb of the exoplanet. Planets orbiting stars with Teff < 5 500 K and with Porb < 20 days generally have much stronger emission than planets at similar temperatures but at longer orbital periods. Porb = 20 days marks a sudden change in behaviour, which might be associated with a qualitative change in the star-planet interaction.
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