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Among more than 450 extra solar planets yet discovered up to now, hot Jupiters class planets are the most interesting to study the interaction of star and planet at distances around 0.1 AU or less. Variations of chromospheric activity phased with the planet orbital period have been discovered in a few systems. The detection of star planet interaction in X-rays

Young low-mass stars are surrounded by circumstellar disks with which they interact in a complex fashion, with accretion of mass and ejection of collimated outflows. The accretion builds up the young star to its final mass and is also believed to power mass outflows, which may in turn remove the excess angular momentum from the star-disk system. However, although the