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Most (~82%) of the over 4000 confirmed exoplanets known today orbit veryclose to their host stars, within 0.5 au. Planets at such small orbitaldistances can result in significant interactions with their host stars, whichcan induce increased activity levels in them. In this work, we have searchedfor statistical evidence for Star-Planet Interactions (SPI) in the ultraviolet(UV) using the largest sample of 1355 GALEX detected host stars with confirmedexoplanets and making use of the improved host star parameters from Gaia DR2.From our analysis, we do not find any significant correlation between the UVactivity of the host stars and their planetary properties. We further comparedthe UV properties of planet host stars to that of chromospherically activestars from the RAVE survey. Our results indicate that the enhancement inchromospheric activity of host stars due to star-planet interactions may not besignificant enough to reflect in their near and far UV broad band flux.

A statistical search for Star-Planet Interaction in the UltraViolet using GALEX