Mapping X-ray conditions in the habitable zones of exoplanet host stars with SRG/eROSITA

Stellar high-energy radiation is a key driver of atmospheric erosion and evolution in exoplanets, directly affecting their long-term habitability. We present a comprehensive study on stellar high-energy radiation and its impact on exoplanetary atmospheres, leveraging data from the eROSITA telescope array aboard the Spektrum Rötgen Gamma (SRG) satellite. Our sample consists of 3750 main-sequence stars identified via cross-matching with DR3. Utilizing X-ray spectral fits from the eROSITA catalog, we computed X-ray luminosities (L_̊m X) and extreme-ultraviolet (EUV) luminosities (L_̊m EUV), derived from scaling relationships, which we used to derive the soft X-ray flux, i.e., combined X-ray and EUV (XUV) fluxes, at the habitable zone (F_ Gaia XUV,HZ ). -2 $,s$^ -1 . The ratio L_ XUV /L_ bol is found to be higher for cooler, magnetically active stars, highlighting their potentially hazardous nature for planetary atmospheres. Applying the energy-limited escape model, we computed atmospheric mass-loss rates for hypothetical Earth-like planets located at the habitable zone of each star. We also present local maps for distances up to 500,pc of the average XUV flux, revealing ``hazard zones'' where stellar radiation could significantly influence planetary atmospheric evolution. This work demonstrates the power of X-ray surveys in constraining the high-energy environments of exoplanets and underscores the critical role of stellar activity in planetary habitability.