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Search for the Star-Planet Interaction

Published online by Cambridge University Press:  23 April 2012

Tereza Krejčová ,
Ján Budaj  and
Július Koza
Tereza Krejčová
Affiliation:
Dept. of Theoretical Physics and Astrophysics, Masaryk University, Brno, Czech Republic, email: terak@physics.muni.cz
Ján Budaj
Affiliation:
Astronomical Institute, Tatranská Lomnica, Slovak Republic, email: budaj@ta3.sk
Július Koza
Affiliation:
Astronomical Institute, Tatranská Lomnica, Slovak Republic, email: budaj@ta3.sk
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Abstract

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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.

Keywords

Ca II K lineexoplanetstar-planet interaction
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Symposium S282: From Interacting Binaries to Exoplanets: Essential Modeling Tools , July 2011 , pp. 125 - 126
Copyright
Copyright © International Astronomical Union 2012

References

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