Habitable zones of exoplanet host stars J/A+A/710/A273 ivo://CDS.VizieR/J/A+A/710/A273 CDS Gatuzz E. Rukdee S. Freund S. Kallman T. Stelzer B. 2026-06-18T07:39:17Z 2026-06-18T08:34:36Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr multiple-stars exoplanets x-ray-sources 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 Rotgen Gamma (SRG) satellite. Our sample consists of 3750 main-sequence stars identified by cross-matching with Gaia DR3. Utilizing X-ray spectral fit s from the eROSITA catalog, we computed X-ray (L_X_) and combined extreme-ultraviolet (EUV) luminosities (L_EUV_), derived from scaling relationships, which we us ed to derive soft X-ray flux (XUV) fluxes at the habitable zone (F_XUV,HZ_). We find that the majority of stars in our sample are significantly more XUV-active than the Sun, with habitable zone fluxes ranging from 10^0 to 10^5^erg/cm^2^/s. The ratio of 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 500pc 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. 2026A&A...710A.273G https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/710/A273 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022) J/A+A/682/A34 : SRG/eROSITA all-sky survey catalogs (eRASS1) (Merloni+, 2024) https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/710/A273 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/710/A273 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/710/A273 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/710/A273 https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/710/A273 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/710/A273 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/A+A/710/A273/table1 (Parameters used for the derivation of luminosities) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/710/A273/table1? https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/710/A273/table1? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/710/A273/table1? GET text/xml+votable 180.0 50000 true 82.18494389 -65.44802 0.005555555555555556 5/5159 8265 8275 8277 8279 8285-8286 8448-8450 8457 8468 8470 8524 8531 8641 9271 9273-9274 9307 9313 9321 9349 9353 9356-9357 9368 9376 9378-9379 9382 9384-9386 9395-9396 9409 9420 9728 9731 9736-9738 9742 9883 10282 10786 10800 10811 10818 10835 6/4118 4123 4127 4190 4208 4240-4241 4279 4314 4344 4381 4388 4396 4417 4421 4438 4468 4486 4505 4591-4592 4603 4674 4693 4699 4711 4715 4718 4733 4821 4845 4863 4875 4915 4920 4960 4976 4979 5054 5074 5079 5081 5088 5108 5141 5254 5325 5342 5354 5387 5413 5670 5677 5692 5706 6147-6148 6169 6189 6208 6217 6223 6244 6268 6286 6340 6384-6385 6420 6423 6674 6676-6677 8366 10250 16450 16645 20489 20491-20492 20498 20505 20508-20510 20517 20519 20522 20524 20528 20532 20534 20536 20538 20541 20550 20564 20589 20594 20610 20618 20622-20623 20627 20643-20645 20649-20651 20655 20657 20659-20660 20663 20686 20700 20703 20706-20707 20715 20718 20725 20732 20734 20740 20747 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43063 43065 43068-43069 43072 43081 43086-43087 43091 43093-43096 43102-43103 43107-43108 43111-43113 43115 43130 43152-43154 43158 43161 43164 43167 43177 43181-43183 43187 43193 43195-43196 43205 43210-43211 43217 43221 43225 43228 43230 43233 43236-43237 43241 43251 43254 43256-43258 43282 43286 43290-43291 43293-43294 43296 43305 43310 43315 43318 43321 43326 43333 43336-43337 43339 43351-43352 43354-43355 43365-43366 43368 43371 43377 43382 43391-43392 43394 43398 43400 43403-43404 43411-43412 43414 43417-43418 43421 43423-43424 43427 43429-43430 43432-43433 43435 43437 43442 43446 43452 43455 43459 43461 43465 43474-43475 43479 43508 43510 43527 43529 43532 43535 43540 43546 43552-43553 43555 43560 43565 43568 43570 43573 43576 43586 43598 43610 43626 43628 43632 43644 43652 43657 43672 43678 43683-43684 43687-43688 43692 43696 43719 43727 43729 43745 43756 43774 43790 43796 43798 43803-43805 43816 43836 43851-43852 43856 43872 43882 43890 43902 43911-43912 43919 43933 43936 43950 43952 44001 44003 44010 44034 44036 44040-44041 44047 44058-44059 44066-44068 44073 44076 44081 44083-44084 44088 44090 44096 44104 44109 44111 44114 44116 44129 44132-44133 44136 44146 44152 44162 44175 44178 44181 44185 44192 44196 44204 44226 44228 44241 44243 44252 44258 44262-44263 44268 44270 44272 44283-44284 44291 44303 44305-44306 44308 44354 44361 44378 44380 44418 44439 44460 44520 44568 44583 44585 44593 44620 44631 44637 44644 44650 44655 44657 44696 44701 44732 44751-44752 44761 44788 44796-44797 44830 44833 44838 44850 44854 44872 44888 44891 44931 44955 44990 45008 45035 45038 45045 45062 45069 45072 45078 45080 45091 45095 45101 45120 45136 45159 45165 45170-45171 45208 45217 45223-45224 45238 45243 45248 45272 45275 45283 45299 45320 45326 45336 45344 45351 45366-45367 45377 45384 45388 45399 45429 45431 45443 45453 45458 45478 45485 45490 45538 45544 45549 45564 45569 45589 45597 45600 45602 45607 45616 45621 45629 45631 45654 45671 45700 45746 45785-45786 45799 45806 45843 45874 45881 45883 45927 45929 45934 45942 45958 45962 45979 45992 46078 46082 46084 46088 46091 46113 46115 46119 46203 46206 46238 46291 46300 46318 46342 46352 46381 46384 46387 46402 46406 46432 46438-46439 46456 46466 46481 46489 46520 46529 46538 46546 46617 46620 46624 46650 46656 46692 46721 46746 46762 47107 47121 47145 47180 47205 47210 47212 47218-47219 47243 47245-47246 47263 47281 47287 47328 47335 47341 47357 47363 47366 47428 47435 47464 47491 47514 47641 47664 47745 47775 47825-47826 47851 47904 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/710/A273?format=ascii X-ray default J/A+A/710/A273/table1 Parameters used for the derivation of luminosities recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int eRASSID ID of source in eRASS1 meta.id;meta.main int RAJ2000 Right ascension (J2000.0) deg pos.eq.ra;meta.main DEJ2000 Declination (J2000.0) deg pos.eq.dec;meta.main Dist The median of the geometric distance posterior pc pos.distance double Gmag Mean magnitude in the G band mag phot.mag;em.opt double BP-RP BP-RP colour mag phot.color;em.opt.B;em.opt.R double plx Parallax mas pos.parallax.trig double F0.2-0.5 Unabsorbed flux in the 0.2-0.5keV energy range obtained by fitting the eROSITA spectra with a 2 Apec model (in erg/cm^2^/s) mW.m**-2 phot.flux;em.X-ray double F0.2-1.0 Unabsorbed flux in the 0.5-1.0keV energy range obtained by fitting the eROSITA spectra with a 2 Apec model (in erg/cm^2^/s) mW.m**-2 phot.flux;em.X-ray double F0.1-2.4 Unabsorbed flux in the 0.1-2.4keV energy range obtained by fitting the eROSITA spectra with a 2 Apec model (in erg/cm^2^/s) mW.m**-2 phot.flux;em.X-ray double MassFlame ? Mass of the star from FLAME solMass phys.mass double nullable TeffMSC1 ? Effective temperature of the primary from MSC using BP/RP spectra and parallax K phys.temperature.effective double nullable