  Low-mass, pre-main sequence stars possess intense high-energy radiation
fields as a result of their strong stellar magnetic activity. This stellar UV
and X-ray radiation may have a profound impact on the lifetimes of
protoplanetary disks. We aim to constrain the X-ray-induced photoevaporation
rates of protoplanetary disks orbiting low-mass stars by analyzing
serendipitous XMM-Newton and Chandra X-ray observations of candidate nearby (D
$<$ 100 pc), young (age $<$ 100 Myr) M stars identified in the GALEX Nearby
Young-Star Survey (GALNYSS).
