期刊
ASTRONOMY & ASTROPHYSICS
卷 515, 期 -, 页码 -出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201014245
关键词
planet-star interactions; stars: activity; stars: coronae; stars: statistics; X-rays: stars
资金
- DLR [50OR0703, 50QR0803]
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 L(X)/L(bol) 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.
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