Coronal properties of planet-bearing stars
K. Poppenhaeger, J. Robrade and J. H. M. M. Schmitt
Hamburger Sternwarte, University Hamburg,
Gojenbergsweg 112, 21029 Hamburg, Germany e-mail: email@example.com
Accepted: 20 March 2010
Context. Do extrasolar planets affect the activity of their host stars? Indications for chromospheric activity enhancement have been found for a handful of targets, but in the X-ray regime, conclusive observational evidence is still missing.
Aims. We want to establish a sound observational basis to confirm or reject major effects of Star-Planet Interactions (SPI) in stellar X-ray emissions.
Methods. We therefore conduct a statistical analysis of stellar X-ray activity of all known planet-bearing stars within 30 pc distance for dependencies on planetary parameters such as mass and semimajor axis.
Results. In our sample, there are no significant correlations of X-ray luminosity or the activity indicator with planetary parameters which cannot be explained by selection effects.
Conclusions. Coronal SPI seems to be a phenomenon which might only manifest itself as a strong effect for a few individual targets, but not to have a major effect on planet-bearing stars in general.
Key words: planet-star interactions / stars: activity / stars: coronae / stars: statistics / X-rays: stars
© ESO, 2010