Protostars and Planets VI, Heidelberg, July 15-20, 2013

Poster 2K057

Study of the X-ray Emission of Stars with Hot Jupiters.

Pillitteri, Ignazio (INAF - Italy)
Wolk, Scott (SAO - USA)
Lopez-Santiago, Javier (Univ. Complutense de Madrid, Spain)
Guenther, Hans Moritz (SAO - USA)
Kashyap, Vinay (SAO - USA)
Drake, Jeremy (SAO -USA)
Sciortino, Salvatore (INAF - USA)

The search of effects of star-planet interaction (SPI) on the host stars has given controversial results, with some systems showing variations of the activity phased with the planetary motion. We present the results of the search of SPI in X-ray band, focusing on 3 systems: HD 189733, HD 162020 and WASP-18. HD 189733 shows many signs of boosted X-ray activity due to SPI, HD 162020 has a variability phased with planet motion of marginal significance. WASP-18 (F6V) is the most controversial system: it has a 10 Mjup planet rotating at 3.5 stellar radii, it is completely dark in X-ray, at odds with an estimate of age of 600 Myr. In this case the massive planet could have a role in modifying or destroying the thin convective layer of the star.

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