SIMBAD references

2008ApJ...687.1339K - Astrophys. J., 687, 1339-1354 (2008/November-2)

Extrasolar giant planets and X-ray activity.


Abstract (from CDS):

We have carried out a survey of X-ray emission from stars with giant planets, combining both archival and targeted surveys. Over 230 stars have been currently identified as possessing planets, and roughly one-third of these have been detected in X-rays. We carry out detailed statistical analysis on a volume-limited sample of main-sequence star systems with detected planets, comparing subsamples of stars that have close-in planets with stars that have more distant planets. This analysis reveals strong evidence that stars with close-in giant planets are on average more X-ray active by a factor of ~4 than those with planets that are more distant. This result persists for various sample selections. We find that even after accounting for observational sample bias, a significant residual difference still remains. This observational result is consistent with the hypothesis that giant planets in close proximity to the primary stars influence the stellar magnetic activity.

Abstract Copyright:

Journal keyword(s): Methods: Statistical - Stars: Planetary Systems - Stars: Activity - Stars: Magnetic Fields - Surveys - X-Rays: General

Simbad objects: 237

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