16901

We propose joint XMM-Newton and HST observations of the nearby young G- type star HIP 67522 Tau comma hosting a close-in Jupiter- size transiting exoplanet discovered with TESS comma and possibly a second smaller body. The first confirmed planet in this young system is expected to be in a contraction phase toward its final size and possible photoevaporation. Our immediate objective is to reconstruct the full XUV spectrum comma and to assess the spectral and time variability of the host star. In this way we will characterize its activity level and the dose of high-energy irradiation in the planetary environment. This system is particularly compelling to investigate evolutionary paths of exo- planets in the mass-radius diagram comma and to provide constraints for planetary atmospheres modeling.