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Discovery of Two Polars from a Crossmatch of ZTF and the SRG/eFEDS X-Ray Catalog

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cris.lastimport.scopus2024-02-12T20:49:45Z
dc.abstract.enMagnetic cataclysmic variables (CVs) are luminous Galactic X-ray sources, which have been difficult to find in purely optical surveys due to their lack of outburst behavior. The eROSITA telescope on board the Spektr-RG mission is conducting an all-sky X-ray survey and recently released the public eROSITA Final Equatorial Depth Survey (eFEDS) catalog. We crossmatched the eFEDS catalog with photometry from the Zwicky Transient Facility and discovered two new magnetic CVs. We obtained high-cadence optical photometry and phase-resolved spectroscopy for each magnetic CV candidate and found them both to be polars. Among the newly discovered magnetic CVs is eFEDS J085037.2+044359/ZTFJ0850+0443, an eclipsing polar with orbital period P <SUB>orb</SUB> = 1.72 hr and WD mass M <SUB>WD</SUB> = 0.81 ± 0.08M <SUB>⊙</SUB>. We suggest that eFEDS J085037.2+044359/ZTFJ0850+0443 is a low magnetic field strength polar, with B <SUB>WD</SUB> ≲ 10 MG. We also discovered a non-eclipsing polar, eFEDS J092614.1+010558/ZTFJ0926+0105, with orbital period P <SUB>orb</SUB> = 1.47 hr and magnetic field strength B <SUB>WD</SUB> = 36-42 MG.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorRodriguez, Antonio C.
dc.contributor.authorKulkarni, Shrinivas R.
dc.contributor.authorPrince, Thomas A.
dc.contributor.authorSzkody, Paula
dc.contributor.authorBurdge, Kevin B.
dc.contributor.authorCaiazzo, Ilaria
dc.contributor.authorRoestel, Jan van
dc.contributor.authorVanderbosch, Zachary P.
dc.contributor.authorEl-Badry, Kareem
dc.contributor.authorBellm, Eric C.
dc.contributor.authorGänsicke, Boris T.
dc.contributor.authorGraham, Matthew J.
dc.contributor.authorMahabal, Ashish A.
dc.contributor.authorMasci, Frank J.
dc.contributor.authorMróz, Przemysław
dc.contributor.authorRiddle, Reed
dc.contributor.authorRusholme, Ben
dc.date.accessioned2024-01-24T21:54:49Z
dc.date.available2024-01-24T21:54:49Z
dc.date.copyright2023-03-15
dc.date.issued2023
dc.description.accesstimeAT_PUBLICATION
dc.description.financePublikacja bezkosztowa
dc.description.number2
dc.description.versionFINAL_PUBLISHED
dc.description.volume945
dc.identifier.doi10.3847/1538-4357/ACBB6F
dc.identifier.issn0004-637X
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/104980
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2023ApJ...945..141R
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofAstrophysical Journal
dc.relation.pages141
dc.rightsCC-BY
dc.sciencecloudnosend
dc.titleDiscovery of Two Polars from a Crossmatch of ZTF and the SRG/eFEDS X-Ray Catalog
dc.typeJournalArticle
dspace.entity.typePublication