Evidence for reduced magnetic braking in polars from binary population models

Abstract

We present the first population synthesis of synchronous magnetic cataclysmic variables, called polars, taking into account the effect of the white dwarf (WD) magnetic field on angular momentum loss. We implemented the reduced magnetic braking (MB) model proposed by Li, Wu & Wickramasinghe into the Binary Stellar Evolution (BSE) code recently calibrated for cataclysmic variable (CV) evolution. We then compared separately our predictions for polars and non-magnetic CVs with a large and homogeneous sample of observed CVs from the Sloan Digital Sky Survey. We found that the predicted orbital period distributions and space densities agree with the observations if period bouncers are excluded. For polars, we also find agreement between predicted and observed mass transfer rates, while the mass transfer rates of non-magnetic CVs with periods $\gtrsim 3$ hr drastically disagree with those derived from observations. Our results provide strong evidence that the reduced MB model for the evolution of highly magnetized accreting WDs can explain the observed properties of polars. The remaining main issues in our understanding of CV evolution are the origin of the large number of highly magnetic WDs, the large scatter of the observed mass transfer rates for non-magnetic systems with periods $\gtrsim 3$ hr, and the absence of period bouncers in observed samples.

arXiv comment15 pages, accepted for publication in MNRAS

References in corpus (126)

• Gaia Data Release 2. Summary of the contents and survey properties
• On the variation of the Initial Mass Function
• The Gaia mission
• Evolution of binary stars and the effect of tides on binary populations
• Estimating distances from parallaxes IV: Distances to 1.33 billion stars in Gaia Data Release 2
• Comprehensive analytic formulae for stellar evolution as a function of mass and metallicity
• The Evolution of Cataclysmic Variables as Revealed by their Donor Stars
• The Catalina Surveys Periodic Variable Star Catalog
• Magnetic White Dwarfs
• The Donor Stars of Cataclysmic Variables
• Post-common-envelope binaries from SDSS. IX: Constraining the common-envelope efficiency
• An Exploration of the Paradigm for the 2-3 Hour Period Gap in Cataclysmic Variables
• Theoretical uncertainties of the type Ia supernova rate
• SDSS unveils a population of intrinsically faint cataclysmic variables at the minimum orbital period
• Binary Star Origin of High Field Magnetic White Dwarfs
• Implications for the formation of star clusters from extra-galactic star-formation rates
• The age, life expectancy, and space density of Post Common Envelope Binaries
• Survey of Period Variations of Superhumps in SU UMa-Type Dwarf Novae
• Spectropolarimetric Survey of Hydrogen-rich White Dwarf Stars
• The binarity of the local white dwarf population
• Cataclysmic Variable Primary Effective Temperatures: Constraints on Binary Angular Momentum Loss
• Cataclysmic Variables from SDSS II. The Second Year
• Theoretical Modeling of the Thermal State of Accreting White Dwarfs Undergoing Classical Novae
• A High Angular Resolution Multiplicity Survey of the Open Clusters alpha Persei and Praesepe
• The effect of common-envelope evolution on the visible population of post-common-envelope binaries
• The Gaia 20 pc white dwarf sample
• The Ages of the Thin Disk, Thick Disk, and the Halo from Nearby White Dwarfs
• On the evolutionary status of short period cataclysmic variables
• A White Dwarf catalogue from Gaia-DR2 and the Virtual Observatory
• On the magnetic topology of partially and fully convective stars
• Three in one go: consequential angular momentum loss can solve major problems of CV evolution
• Measuring White Dwarf Accretion Rates via their Effective Temperatures
• Population Synthesis of Cataclysmic Variables: I. Inclusion of Detailed Nuclear Evolution
• Monte Carlo simulations of post-common-envelope white dwarf + main sequence binaries: comparison with the SDSS DR7 observed sample
• Is FIRST J102347.6+003841 Really a Cataclysmic Binary?
• WZ Sge-Type Dwarf Novae
• A common origin of magnetism from planets to white dwarfs
• Far-ultraviolet Spectroscopy of Magnetic Cataclysmic Variables
• Effective Temperatures of Cataclysmic Variable White Dwarfs as a Probe of their Evolution
• New Low Accretion-Rate Magnetic Binary Systems and their Significance for the Evolution of Cataclysmic Variables
• SW Sextantis stars: the dominant population of CVs with orbital periods between 3-4 hours
• A brown dwarf mass donor in an accreting binary
• Superhumps in Cataclysmic Binaries. XXIV. Twenty More Dwarf Novae
• Cataclysmic Variables below the Period Gap: Mass Determinations of 14 Eclipsing Systems
• The census of cataclysmic variables in the ROSAT Bright Survey
• The evolutionary status of Cataclysmic Variables: Eclipse modelling of 15 systems
• High speed photometry of faint Cataclysmic Variables: IV. V356 Aql, Aqr1, FIRST J1023+0038, Ha 0242-2802, GI Mon, AO Oct, V972 Oph, SDSS 0155+00, SDSS 0233+00, SDSS 1240-01, SDSS 1556-00, SDSS 2050-05, FH Ser
• Survey of Period Variations of Superhumps in SU UMa-Type Dwarf Novae. IV: The Fourth Year (2011-2012)
• Evolution of Cataclysmic Variables and Related Binaries Containing a White-Dwarf
• Classical Novae as a Probe of the Cataclysmic Variable Population
• CV evolution: AM Her binaries and the period gap
• One thousand cataclysmic variables from the Catalina Real-time Transient Survey
• The space density and X-ray luminosity function of non-magnetic cataclysmic variables
• The Dwarf Novae of Shortest Period
• The space density of magnetic cataclysmic variables
• VLT/FORS spectroscopy of faint cataclysmic variables discovered by the Sloan Digital Sky Survey
• Detached cataclysmic variables are crossing the orbital period gap
• How Many CVs are Crossing the Period Gap? A Test for the Disruption of Magnetic Braking
• No cataclysmic variables missing: higher merger rate brings into agreement observed and predicted space densities
• MOCCA-SURVEY database I. Accreting white dwarf binary systems in globular clusters -- IV. cataclysmic variables -- properties of bright and faint populations
• CSS100603:112253-111037: A helium-rich dwarf nova with a 65 minute orbital period
• Survey of Period Variations of Superhumps in SU UMa-Type Dwarf Novae. V: The Fifth Year (2012-2013)
• QZ Serpentis: A Dwarf Nova with a 2-Hour Orbital Period and an Anomalously Hot, Bright Secondary Star
• Mass distributions of star clusters for different star formation histories in a galaxy cluster environment
• Spectroscopic search for new SW Sextantis stars in the 3-4 hour orbital period range -- I
• A ZZ Ceti white dwarf in SDSS J133941.11+484727.5
• Orbital periods of cataclysmic variables identified by the SDSS. III. Time-series photometry obtained during the 2004/5 International Time Project on La Palma
• The nature of the close magnetic white dwarf + probable brown dwarf binary SDSS J121209.31+013627.7
• Two Rare Magnetic Cataclysmic Variables with Extreme Cyclotron Features Identified in the Sloan Digital Sky Survey
• Post common envelope binaries from the SDSS. VI. SDSS J120615.73+510047.0: a new low accretion rate magnetic binary
• High speed photometry of faint Cataclysmic Variables - VII. Targets selected from the Sloan Digital Sky Survey and the Catalina Real-time Transient Survey
• ULTRACAM photometry of the eclipsing cataclysmic variables XZ Eri and DV UMa
• The chemical evolution of galaxies with a variable IGIMF
• The population of white dwarf-main sequence binaries in the SDSS DR 12
• Two Additions to the New Class of Low Accretion-Rate Magnetic Binaries
• ULTRACAM photometry of the eclipsing cataclysmic variables GY Cnc, IR Com and HT Cas
• XMM-Newton and optical follow-up observations of SDSS J093249.57+472523.0 and SDSS J102347.67+003841.2
• Dwarf novae in the Hamburg Quasar Survey: Rarer than expected
• SDSS J161033.64-010223.3: A second Cataclysmic Variable with a Non-radially Pulsating Primary
• High-speed energy-resolved STJ photometry of the eclipsing dwarf nova IY UMa
• A magnetic white dwarf in a detached eclipsing binary
• Hunting For Eclipses: High Speed Observations of Cataclysmic Variables
• Orbital periods of cataclysmic variables identified by the SDSS. II. Measurements for six objects, including two eclipsing systems
• DW Cancri: a magnetic VY Scl star with an orbital period of 86 minutes
• The origin of single low-mass WDs: another problem that consequential angular momentum loss in CVs might solve
• SDSS J233325.92+152222.1 and the evolution of intermediate polars
• Optical and X-ray Studies of Ten X-ray Selected Cataclysmic Binaries
• On the space density of X-ray selected cataclysmic variables
• A Trip to the Cataclysmic Binary Zoo: Detailed Follow-Up of 35 Recently-Discovered Systems
• The evolutionary state of short period magnetic white dwarf binaries
• The serendipituous discovery of a short-period eclipsing polar in 2XMMp
• Cyclic brightening in the short-period WZ Sge-type cataclysmic variable SDSS J080434.20+510349.2
• XMM-Newton observations of the complex spin pulse of the intermediate polar PQ~Geminorum
• Orbital periods of cataclysmic variables identified by the SDSS. VI. The 4.5-hr period eclipsing system SDSS J100658.40+233724.4
• Spectroscopy of Seven Cataclysmic Variables with Periods Above Five Hours
• Spectroscopy and orbital periods of four cataclysmic variable stars
• Followup Observations of SDSS and CRTS Candidate Cataclysmic Variables
• Evidence for mass accretion driven by spiral shocks onto the white dwarf in SDSS J123813.73-033933.0
• SDSS J210014.12+004446.0 - dwarf nova with negative and positive superhumps
• SDSSJ001153.08-064739.2, a cataclysmic variable with an evolved donor in the period gap
• Orbital periods of cataclysmic variables identified by the SDSS. V. VLT, NTT and Magellan observations of nine equatorial systems
• ULTRACAM photometry of the eclipsing cataclysmic variable OU Vir
• Two new accreting, pulsating white dwarfs: SDSS J1457+51 and BW Sculptoris
• Spectroscopic Orbital Periods for 29 Cataclysmic Variables from the Sloan Digital Sky Survey
• Spectroscopy of Four Cataclysmic Variables with Periods above 7 Hours
• Orbital periods of cataclysmic variables identified by the SDSS. VII. Four new eclipsing systems
• On the SW Sex-Type Eclipsing Cataclysmic Variable SDSS0756+0858
• Orbital periods of cataclysmic variables identified by the SDSS. IX. NTT photometry of eight eclipsing and three magnetic systems
• High Speed Photometry of SDSS J013701.06-091234.9
• High speed photometry of faint cataclysmic variables - VI. Car2, V1040 Cen, Ha 075648, IL Nor (Nova Nor 1893), HS Pup (Nova Pup 1963), SDSS J2048-06, CSS 081419-005022 and CSS 112634-100210
• V405 Peg (RBS 1955): A Nearby, Low-Luminosity Cataclysmic Binary
• Orbital periods of cataclysmic variables identified by the SDSS. IV. SDSS J220553.98+115553.7 has stopped pulsating
• XMM-Newton and Optical Observations of Cataclysmic Variables from SDSS
• The Space Density of Post-Period Minimum Cataclysmic Variables
• XMM-Newton and optical follow-up observations of three new polars from the Sloan Digital Sky Survey
• The Evolved Main-Sequence Channel: HST and LBT observations of CSS120422:111127+571239
• A photometric study of the newly discovered eclipsing cataclysmic variable SDSS J040714.78-064425.1
• On the secondary star of the cataclysmic variable 1RXS J094432.1+035738
• SDSS J162520.29+120308.7 - a new SU UMa star in the period gap
• Multiwavelength observations of V479 Andromedae: a close compact binary with an identity crisis
• Curious Variables Experiment (CURVE). CCD photometry of active dwarf nova DI UMa
• Curious Variables Experiment (CURVE). CCD Photometry of QW Serpentis in Superoutburst and Quiescence
• Orbital periods of cataclysmic variables identified by the SDSS. VIII. A slingshot prominence in SDSS J003941.06+005427.5?
• Time-Resolved Photometry of the Optical Counterpart of Swift J2319.4+2619
• Photometry of the SW Sex-type nova-like BH Lyncis in high state
• The New Eclipsing Cataclysmic Variable SDSS 154453+2553

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• A Volume Limited Sample of Cataclysmic Variables from $Gaia$ DR2: Space Density and Population Properties
• The origin and evolution of magnetic white dwarfs in close binary stars
• Constraining the Evolution of Cataclysmic Variables via the Masses and Accretion Rates of their Underlying White Dwarfs
• I Spy Transits and Pulsations: Empirical Variability in White Dwarfs Using Gaia and the Zwicky Transient Facility
• Preparing the next gravitational million-body simulations: Evolution of single and binary stars in Nbody6++GPU, MOCCA and McLuster
• Formation of millisecond pulsars with helium white dwarfs, ultra-compact X-ray binaries and gravitational wave sources
• Magnetic braking saturates: evidence from the orbital period distribution of low-mass detached eclipsing binaries from ZTF
• Magnetic white dwarfs in post-common-envelope binaries
• The cataclysmic variable orbital period gap: More evident than ever
• Galactic Model Parameters and Space Density of Cataclysmic Variables in Gaia Era: New Constraints to Population Models
• Reversing the verdict: Cataclysmic variables could be the dominant progenitors of AM CVn binaries after all
• Are white dwarf magnetic fields in close binaries generated during common-envelope evolution?
• Period bouncers as detached magnetic cataclysmic variables
• Discovery of Two Polars from a Crossmatch of ZTF and the SRG/eFEDS X-ray Catalog
• A brown dwarf donor and an optically thin accretion disc with a complex stream impact region in the period-bouncer candidate BW Sculptoris
• Compact white-dwarf binaries in the combined SRG/eROSITA/SDSS eFEDS survey
• Most EL CVn systems are inner binaries of hierarchical triples
• Population synthesis of accreting white dwarfs: Rates and evolutionary pathways of H and He novae
• Long-term photometric monitoring and spectroscopy of the white dwarf pulsar AR Scorpii
• New X-ray detections of magnetic period-bounce cataclysmic variables from XMM-Newton and SRG/eROSITA
• Formation and Evolution of Accreting Compact Objects
• Further evidence of saturated, boosted, and disrupted magnetic braking from evolutionary tracks of cataclysmic variables
• A Joint SRG/eROSITA + ZTF Search: Discovery of a 97-min Period Eclipsing Cataclysmic Variable with Evidence of a Brown Dwarf Secondary
• 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
• Identification of 3XMM J000511.8+634018 as a new polar at P(orb)=133.5 min -- is it inside or outside the period gap?
• Cataclysmic variables around the period-bounce: An eROSITA-enhanced multi-wavelength catalog
• Life after eruption VIII: The orbital periods of novae
• Population-based identification of Hα-excess sources in the Gaia DR2 and IPHAS catalogues
• X-ray and ultraviolet observations of the eclipsing cataclysmic variables OV Bootis and SDSS J103533.02+055158.3 with degenerate donors
• Search for magnetic accretion in SW Sextantis systems
• Suggested magnetic braking prescription derived from field complexity fails to reproduce the cataclysmic variable orbital period gap
• GOTO065054+593624: a 8.5 mag amplitude dwarf nova identified in real time via Kilonova Seekers
• Magnetic braking below the cataclysmic variable period gap and the observed dearth of period bouncers
• A modest change in magnetic braking at the fully convective boundary explains cataclysmic variable evolution
• First Detailed Analysis of a Relatively Deep, Low Mass-ratio Contact Binary: ATO J108.6991+27.8306
• eROSITA-selection of new period-bounce Cataclysmic Variables: First follow-up confirmation using TESS and SDSS
• Multiwavelength Characterization of a New Magnetic Cataclysmic Variable 2CXO J050740.7-091337
• Mechanisms for magnetic braking boost and disruption: the role of irradiation-driven winds and convective turnover time spike in cataclysmic variables