Planets spinning up their host stars

We have collected initial evidence that tidal interaction between a latetypestar and its closein, massive planet can lead to a spinup of the host star. Wepropose to explore this further by studying a small sample of proper motionpairs in which one of the stars is orbited a Hot Jupiter. We will determine ifthe gyrochronal age is different for the two stars, which would indicate a tidalspin up of the planet host star. We propose to observe 3 such systems with XMM,and to perform similar Chandra observations of 3 more systems with angularseparations <10... We also propose to observe 10 nearby wide latetype binarieswithout planets to establish a reliable baseline for activity scatter in coevalpairs of stars. The total proposed exposures are 142ks(XMM) + 119ks(Chandra). truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]