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Cataclysmic Variable Candidates Identified in eROSITA-DE DR1,XMM-Newton, Swift, and ROSAT Catalogs
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Cataclysmic variables (CVs) are binary systems with a white dwarf accreting matter from a low-mass star, making them significant sources of X-ray emission in the Galaxy. We present a systematic search for X-ray emitting CV candidates by cross-matching four X-ray catalogs (eROSITA, XMM-Newton, Swift, and ROSAT) with Gaia sources located in the bridge region between the main sequence and white dwarf cooling sequence in the Hertzsprung-Russell diagram. From 444 candidates (267 confirmed CVs and 177 new candidates), we detect orbital modulation in 56 sources using ZTF/TESS light curves. The eROSITA catalog contributes 51% of candidates, outperforming other surveys due to its wider sky coverage and higher sensitivity (~10^{-14} erg cm^{-2} s^{-1}). Our method demonstrates the efficiency of combining X-ray data with time-domain analysis for CV identification, with future eROSITA observations expected to expand the population of X-ray emitting CVs.
Forward citations
Cited by 2 Pith papers
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Cataclysmic Variables Photometric Periods from TESS
TESS photometry yields coherent periods for 1,362 CVs, including roughly 465–565 first determinations, and confirms the 2–3 h period gap with a median period near 3.68 h.
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Searching for Accreting Compact Object Binaries in SRG/eROSITA eRASS1
A selection combining eROSITA X-ray fluxes, Gaia optical colors, and ZTF short-period variability yields 22 accreting compact object binary candidates in eRASS1, two of which are known systems.
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