The influence of young stellar coronae on young exoplanets

We propose Xray observations of nearby FGK young (2040 Myr) stars hostingtransiting exoplanets, recently discovered by TESS and Kepler (K2), and includedin followup campaigns with HARPS@ESO 3.6m and HARPSN@TNG. DS Tuc and HD 33512host superEarth/Neptune mass planets with inflated atmospheres, due to strongirradiation from their host stars. V1298 Tau harbors a warm Jupiter still incontraction toward its final size. Our immediate objective is to assess Xrayspectral and time variability of the host stars, so to characterize theiractivity level and the dose of highenergy radiation received by very youngplanets. Final goals are the determination of evolutionary paths of exoplanetsin the massradius diagram, and constraints for modeling planetary atmospheres. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]