Cataclysmic Variable Candidates Identified in eROSITA-DE DR1,XMM-Newton, Swift, and ROSAT Catalogs
arXiv:2504.10794 · doi:10.1051/0004-6361/202452230
Abstract
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.
14 pages,11 figures, accepted for publication in A&A
References in corpus (13)
- The Astropy Project: Sustaining and Growing a Community-oriented Open-source Project and the Latest Major Release (v5.0) of the Core Package
- The Transiting Exoplanet Survey Satellite
- The Zwicky Transient Facility: Data Processing, Products, and Archive
- astroquery: An Astronomical Web-Querying Package in Python
- Second ROSAT all-sky survey (2RXS) source catalogue
- Assessing statistical significance of periodogram peaks
- The XMM-Newton serendipitous survey IX. The fourth XMM-Newton serendipitous source catalogue
- The SRG/eROSITA all-sky survey: First X-ray catalogues and data release of the western Galactic hemisphere
- A radio pulsing white dwarf binary star
- Cataclysmic Variables from the Catalina Real-time Transient Survey
- A catalogue of high-mass X-ray binaries in the Galaxy: from the INTEGRAL to the Gaia era
- A Joint SRG/eROSITA + ZTF Search: Discovery of a 97-min Period Eclipsing Cataclysmic Variable with Evidence of a Brown Dwarf Secondary
- Searching for cataclysmic variable stars in unidentified X-ray sources