Coronal properties of planet-bearing stars

K. Poppenhaeger, J. Robrade, J. H. M. M. Schmitt

Research output: Contribution to journalArticlepeer-review

76 Citations (Scopus)

Abstract

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.
Original languageEnglish
JournalAstronomy & Astrophysics
Volume515
Issue numberA98
Publication statusPublished - 01 Jun 2010

Keywords

  • planet-star interactions
  • stars: activity
  • stars: coronae
  • stars: statistics
  • X-rays: stars

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