Cataclysmic variables around the period-bounce: An eROSITA-enhanced multi-wavelength catalog
arXiv:2401.17298 · doi:10.1051/0004-6361/202449358
Abstract
Context. Cataclysmic variables with degenerate donors which have evolved past the period minimum, also known as period-bouncers, are predicted to make up a great portion of the cataclysmic variable population, between 40 and 70 percent. However, either due to shortcomings in the models or due to the intrinsic faintness of these strongly evolved systems, only a few have been confidently identified so far. Aims. We have compiled a multi-wavelength catalog of period-bouncers and cataclysmic variables around the period minimum from the literature in order to provide an in-depth characterization of the elusive subclass of period-bounce CVs that will help in the identification of new candidates. Methods. In this study we combine published or archival multi-wavelength data with new X-ray observations from the all-sky surveys carried out with the extended ROentgen Survey with an Imaging Telescope Array (eROSITA) onboard the Spektrum-Roentgen-Gamma spacecraft (SRG). Our catalog comprises 192 cataclysmic variables around the period minimum that were chosen as likely period bounce candidates based on reported short orbital periods and low donor mass. This sample helped us establish specific selection parameters that have been used to compile a scorecard which rates a systems likelihood of being a period-bouncer. Results. Our scorecard correctly assigns high scores to the already confirmed period-bouncers in our literature catalog and it identifies 80 additional strong period-bounce candidates present in the literature that have not been classified as such. We established two selection cuts based on the X-ray-to-optical flux ratio and the typical X-ray luminosity observed from the 8 already confirmed period-bouncers with eROSITA data. These X-ray selection cuts led to the categorization of 5 systems as new period-bouncers, increasing their population number to 22 systems.
arXiv comment18 pages, 17 figures. Submitted to A&A
References in corpus (77)
- The UKIRT Infrared Deep Sky Survey (UKIDSS)
- Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3
- Gaia Early Data Release 3: The astrometric solution
- The eROSITA X-ray telescope on SRG
- Gaia Data Release 2: using Gaia parallaxes
- VOSA: Virtual Observatory SED Analyzer. An application to the Collinder 69 open cluster
- The Evolution of Cataclysmic Variables as Revealed by their Donor Stars
- Estimating distances from parallaxes
- Revised Catalog of GALEX Ultraviolet Sources. I. The All-sky Survey: GUVcat_AIS
- The SRG X-ray orbital observatory, its telescopes and first scientific results
- The eROSITA Final Equatorial Depth Survey (eFEDS): The X-ray catalog
- The Donor Stars of Cataclysmic Variables
- A catalogue of white dwarfs in Gaia EDR3
- An Exploration of the Paradigm for the 2-3 Hour Period Gap in Cataclysmic Variables
- SDSS unveils a population of intrinsically faint cataclysmic variables at the minimum orbital period
- Post-common-envelope binaries from SDSS. XI: The white dwarf mass distributions of CVs and pre-CVs
- Superhumps in Cataclysmic Binaries. XXV. q_crit, epsilon(q), and Mass-Radius
- Brown Dwarfs and the Cataclysmic Variable Period Minimum
- A Volume Limited Sample of Cataclysmic Variables from DR2: Space Density and Population Properties
- Survey of Period Variations of Superhumps in SU UMa-Type Dwarf Novae
- Finding counterparts for All-sky X-ray surveys with Nway: a Bayesian algorithm for cross-matching multiple catalogues
- The 2001 Superoutburst of WZ Sagittae
- DA white dwarfs in SDSS DR7 and a search for infrared excess emission
- On the evolutionary status of short period cataclysmic variables
- A White Dwarf catalogue from Gaia-DR2 and the Virtual Observatory
- Three in one go: consequential angular momentum loss can solve major problems of CV evolution
- The chemical diversity of exo-terrestrial planetary debris around white dwarfs
- The origin and evolution of magnetic white dwarfs in close binary stars
- HS2331+3905: The cataclysmic variable that has it all
- Population Synthesis of Cataclysmic Variables: I. Inclusion of Detailed Nuclear Evolution
- I Spy Transits and Pulsations: Empirical Variability in White Dwarfs Using Gaia and the Zwicky Transient Facility
- WZ Sge-Type Dwarf Novae
- Effective Temperatures of Cataclysmic Variable White Dwarfs as a Probe of their Evolution
- Cataclysmic Variables below the Period Gap: Mass Determinations of 14 Eclipsing Systems
- The evolutionary status of Cataclysmic Variables: Eclipse modelling of 15 systems
- New Method to Estimate Binary Mass Ratios by Using Superhumps
- Evidence for reduced magnetic braking in polars from binary population models
- CV evolution: AM Her binaries and the period gap
- A catalogue of cataclysmic variables from 20 years of the Sloan Digital Sky Survey with new classifications, periods, trends and oddities
- The space density of magnetic cataclysmic variables
- VLT/FORS spectroscopy of faint cataclysmic variables discovered by the Sloan Digital Sky Survey
- A Catalogue of Potential Post Common Envelope Binaries
- A Chandra X-ray detection of the L dwarf binary Kelu-1: Simultaneous Chandra and Very Large Array observations
- Statistical analysis of properties of dwarf novae outbursts
- The nature of the close magnetic white dwarf + probable brown dwarf binary SDSS J121209.31+013627.7
- Discovery of a Magnetic White Dwarf/Probable Brown Dwarf Short-Period Binary
- An irradiated brown-dwarf companion to an accreting white dwarf
- Pulsations, Boundary Layers, and Period Bounce in the Cataclysmic Variable RE J1255+266
- A Near-Infrared Spectroscopic Study of the Accreting Magnetic White Dwarf SDSS J121209.31+013627.7 and its Substellar Companion
- White dwarf masses in cataclysmic variables
- The accretion disk in the post period-minimum cataclysmic variable SDSS J080434.20+510349.2
- Towards a volumetric census of close white dwarf binaries I.Reference samples
- The cataclysmic variable QZ Lib: a period bouncer
- Mass Determination and Detection of the Onset of Chromospheric Activity for the Sub-Stellar Object in EF Eridani
- On the evidence for brown-dwarf secondary stars in cataclysmic variables
- The evolutionary state of short period magnetic white dwarf binaries
- SDSS J105754.25+275947.5: a period-bounce eclipsing cataclysmic variable with the lowest-mass donor yet measured
- Period bouncers as detached magnetic cataclysmic variables
- GD 552: a cataclysmic variable with a brown dwarf companion?
- EXTraS discovery of an X-ray superflare from an L dwarf
- Signs of accretion in the white dwarf + brown dwarf binary NLTT5306
- Evidence for mass accretion driven by spiral shocks onto the white dwarf in SDSS J123813.73-033933.0
- X-ray orbital modulation of a white dwarf accreting from an L dwarf: The system SDSS J121209.31+013627.7
- A brown dwarf donor and an optically thin accretion disc with a complex stream impact region in the period-bouncer candidate BW Sculptoris
- ASASSN-16dt and ASASSN-16hg: Promising Candidates for a Period Bouncer
- X-Shooting EF Eridani: further evidence for a massive white dwarf and a sub-stellar secondary
- A Radial Velocity Study of CTCV J1300-3052
- New X-ray detections of magnetic period-bounce cataclysmic variables from XMM-Newton and SRG/eROSITA
- Dwarf Novae in the Shortest Orbital Period Regime: II. WZ Sge Stars as the Missing Population near the Period Minimum
- The Space Density of Post-Period Minimum Cataclysmic Variables
- Direct Detection of the L-Dwarf Donor in WZ Sagittae
- Disk or Companion: Characterizing Excess Infrared Flux in Seven White Dwarf Systems with Near-Infrared Spectroscopy
- Neglected X-ray discovered polars: III. RX J0154.0-5947, RX J0600.5-2709, RX J0859.1+0537, RX J0953.1+1458, and RX J1002.2-1925
- The magnetic system SMSS J1606-1000 as a period bouncer
- CSS1603+19: a low-mass polar near the cataclysmic variable period minimum
- X-ray and ultraviolet observations of the eclipsing cataclysmic variables OV Bootis and SDSS J103533.02+055158.3 with degenerate donors
- The period bouncer system SDSS J105754.25+275947.5: first radial velocity study