XUV Irradiation of Young Exoplanetary Atmospheres - Two study cases

Observations and modeling of stellar XUV emission in different evolutionary phases is fundamental to understand photochemistry and evaporation processes in exoplanetary atmospheres. As part of the on-going project THE StellaR PAth (Time-dependent High-Energy Radiation and Planetary Atmosphere interaction) we present initial results of our first two study cases of gaseous exoplanets irradiated by young solar-like stars, based on dedicated follow-up observations of the host stars with XMM-Newton and HST. The systems are orbiting the young stars V1298 Tau and DS Tuc A, for which we derived spectral properties of the high-energy emission during quiescent and flaring states. We discuss short-term and long-term effects of the XUV irradiation on the planetary atmospheres.We acknowledge financial contribution from the ASI-INAF agreement n.2018-16-HH.0 (THE StellaR PAth project), and from the ARIEL ASI-INAF agreement n.2021-5-HH.0. We also acknowledge partial support by the projects HOT-ATMOS (PRIN INAF 2019) and PLATEA (ASI-INAF agreement n.2018-16-HH.0)