Astronomy and Astrophysics – Astrophysics – Earth and Planetary Astrophysics
Scientific paper
2011-07-29
Astronomy and Astrophysics
Astrophysics
Earth and Planetary Astrophysics
2 pages, 2 figures, to appear in the proceedings of IAU Symposium 282: "From Interacting Binaries to Exoplanets:Essential Mode
Scientific paper
We analyse the chromospherical activity of stars with extrasolar planets and search for a possible correlation between the equivalent width of the core of Ca II K line and orbital parameters of the planet. We found a 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 P_orb of the exoplanet. Planets orbiting stars with T_eff < 5500 K and with P_orb < 20 days generally have much stronger emission than planets at similar temperatures but at longer orbital periods. P_orb=20 days marks a sudden change in behaviour, which might be associated with a qualitative change in the star-planet interaction.
Budaj Jan
Koza Julius
Krejcova Tereza
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