Exoplanet X-ray irradiation and evaporation rates

This work is based on data from eROSITA, the soft X-ray instrument on board the Spectrum Roentgen Gamma (SRG) mission, as well as on archival data from other missions. We aim to characterise the high-energy environment of known exoplanets and estimate their mass-loss rates.

We use X-ray source catalogues from eROSITA, XMM-Newton, Chandra, and ROSAT to derive X-ray luminosities of exoplanet host stars in the 0.2-2 keV energy band with an underlying coronal, that is, optically thin thermal spectrum. We present a catalogue of stellar X-ray and EUV luminosities, exoplanetary X-ray and EUV irradiation fluxes, and estimated mass-loss rates for total of 287 exoplanets, 96 of which are characterised for the first time based on new eROSITA detections.