Cool Stars 14 - Submitted Abstract # 208
This version created on 05 October 2006

Is Stellar X-Ray Activity affected by Close-in Extrasolar Giant
Planets?


Vinay Kashyap, CfA
Jeremy Drake, CfA
Steve Saar, CfA

We have carried out a survey of X-ray emission from stars with
close-in giant planets (CEGP).  Of the >150  stars that have been
currently identified as possessing planets, a third have been detected
in observations carried out with ROSAT and XMM.  We carry out detailed
statistical analyses, comparing subsamples of stars that have close-in
planets with stars that have more distant planets, and find strong
evidence that stars with close-in giant planets are on average more
X-ray active by a factor $\gtrsim 3$ than those with planets that are
more distant.  We thus conclude that CEGPs may measurably affect the
X-ray activity of the host star.

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