Measuring the masses of magnetic white dwarfs: A NuSTAR Legacy Survey

Abstract

The hard X-ray spectrum of magnetic cataclysmic variables can be modelled to provide a measurement of white dwarf mass. This method is complementary to radial velocity measurements, which depend on the (typically rather uncertain) binary inclination. Here we present results from a Legacy Survey of 19 magnetic cataclysmic variables with NuSTAR. We fit accretion column models to their 20-78 keV spectra and derive the white dwarf masses, finding a weighted average ${\bar{M}}_{\mathrm{WD}}=0.77\pm 0.02$ $M_{\odot }$, with a standard deviation $\sigma =0.10$ $M_{\odot }$, when we include the masses derived from previous NuSTAR observations of seven additional magnetic cataclysmic variables. We find that the mass distribution of accreting magnetic white dwarfs is consistent with that of white dwarfs in non-magnetic cataclysmic variables. Both peak at a higher mass than the distributions of isolated white dwarfs and post-common-envelope binaries. We speculate as to why this might be the case, proposing that consequential angular momentum losses may play a role in accreting magnetic white dwarfs and/or that our knowledge of how the white dwarf mass changes over accretion-nova cycles may also be incomplete.

arXiv comment14 pages. 5 figures in main paper, 1 figure in appendix. Accepted for publication in MNRAS

References in corpus (51)

• The Nuclear Spectroscopic Telescope Array (NuSTAR) Mission
• Estimating distances from parallaxes IV: Distances to 1.33 billion stars in Gaia Data Release 2
• The Burst Alert Telescope (BAT) on the Swift MIDEX Mission
• The MAXI Mission on the ISS: Science and Instruments for Monitoring All Sky X-Ray Images
• The 70 Month Swift-BAT All-Sky Hard X-Ray Survey
• The Evolution of Cataclysmic Variables as Revealed by their Donor Stars
• An Extended Grid of Nova Models: II. The Parameter Space of Nova Outbursts
• Magnetic White Dwarfs
• X-ray Emissions from Accreting White Dwarfs: a Review
• Stingray: A Modern Python Library For Spectral Timing
• Post-common-envelope binaries from SDSS. XI: The white dwarf mass distributions of CVs and pre-CVs
• New white dwarf and subdwarf stars in the Sloan Digital Sky Survey Data Release 12
• The effect of common-envelope evolution on the visible population of post-common-envelope binaries
• Three in one go: consequential angular momentum loss can solve major problems of CV evolution
• Magnetic fields in isolated and interacting white dwarfs
• Effects of Gravity on the Structure of Postshock Accretion Flows in Magnetic Cataclysmic Variables
• Monte Carlo simulations of post-common-envelope white dwarf + main sequence binaries: comparison with the SDSS DR7 observed sample
• RXTE broadband X-ray spectra of intermediate polars and white dwarf mass estimates
• Carbon-Oxygen Classical Novae are Galactic ${}^7$Li Producers as well as Potential Supernova Ia Progenitors
• White dwarf masses in intermediate polars observed with the Suzaku satellite
• Quenching of the accretion disk strong aperiodic variability at the magnetospheric boundary
• Hard X-ray view on intermediate polars in the Gaia era
• Intermediate polars in the Swift/BAT survey: Spectra and white dwarf masses
• Characterization of new hard X-ray Cataclysmic Variables
• XMM-Newton observations of polars in low accretion states
• Evidence for intermediate polars as the origin of the Galactic Center hard X-ray emission
• Complex Absorption and Reflection of a Multi-temperature Cyclotron-Bremsstrahlung X-ray Cooling Shock in BY Cam
• Hard X-ray Cataclysmic Variables
• Hard X-ray properties of magnetic cataclysmic variables
• Observational Signatures of SNIa Progenitors, as Predicted by Models
• Unambiguous Detection of Reflection in Magnetic Cataclysmic Variables: Joint NuSTAR-XMM-Newton Observations of Three Intermediate Polars
• The X-ray emission of the Intermediate Polar V709 Cas
• GK Per and EX Hya: Intermediate polars with small magnetospheres
• White dwarf masses in cataclysmic variables
• Gaia Reveals Evidence for Merged White Dwarfs
• X-ray and Optical Study of the Gamma-ray Source 3FGL J0838.8$-$2829: Identification of a Candidate Millisecond Pulsar Binary and an Asynchronous Polar
• The X-ray properties of the magnetic Cataclysmic Variable UU Col
• Observational evidence for matter propagation in accretion flows
• Multi-band study of RX J0838-2827 and XMM J083850.4-282759: a new asynchronous magnetic cataclysmic variable and a candidate transitional millisecond pulsar
• Are white dwarf magnetic fields in close binaries generated during common-envelope evolution?
• The Spin-Period History of Intermediate Polars
• Measuring the masses of Intermediate Polars with NuSTAR: V709 Cas, NY Lup and V1223 Sgr
• Magnetically moderated outbursts of WZ Sagittae
• X-ray observations of FO Aqr during the 2016 low state
• The Magnetospheric Boundary in Cataclysmic Variables
• The near-synchronous polar V1432 Aql (RX J1940.1-1025): Accretion geometry and synchronization time scale
• Constraining the accretion geometry of the intermediate polar EX Hya using NuSTAR, Swift and Chandra observations
• The Fe Line Flux Ratio as a diagnostic of the maximum temperature and the white dwarf mass of Cataclysmic Variables
• DW Cancri in x-rays
• Multiwavelength study of RX J2015.6+3711: a magnetic cataclysmic variable with a 2-hr spin period
• A Serendipitous XMM-Newton Observation of the Intermediate Polar WX Pyx

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• Magnetic white dwarfs in post-common-envelope binaries
• Localised thermonuclear bursts from accreting magnetic white dwarfs
• The Orbital Period vs. Absolute Magnitude Relationship of Intermediate Polars: Implications for Low States and Outbursts
• Hard X-ray luminosity functions of cataclysmic variables: Joint Swift/BAT and Gaia data
• Classifying IGR J18007-4146 as an intermediate polar using XMM and NuSTAR
• Hitting a New Low: The Unique 28 h Cessation of Accretion in the TESS Light Curve of YY Dra (DO Dra)
• Discovery of periodicities in two highly variable intermediate polars towards the Galactic Center
• Breaking the degeneracy in magnetic cataclysmic variable X-ray spectral modeling using X-ray light curves
• Classifying IGR J15038-6021 as a magnetic CV with a massive white dwarf
• X-ray spectroscopy method of white dwarf mass determination in intermediate polars. External systematic uncertainties
• Unravelling optical and X-ray properties of the disc-dominated intermediate polar IGR J15094-6649
• X-ray confirmation of the intermediate polar IGR J16547-1916
• Broad Observational Perspectives Achieved by the Accreting White Dwarf Sciences in the XMM-Newton and Chandra Eras
• Dynamical mass of the white dwarf in XY Ari: a test for intermediate polar X-ray spectral models
• XMM-Newton and NuSTAR discovery of a likely IP candidate XMMU J173029.8-330920 in the Galactic Disk
• Gravitational Redshift Detection from the Magnetic White Dwarf Harbored in RX J1712.6-2414
• X-ray emission mechanisms in accreting white dwarfs
• Indications of magnetic accretion in Swift J0826.2-7033
• Significant reflection and absorption effects in the X-ray emission of the Intermediate Polar IGR J17195-4100
• Investigating the low-flux states in six Intermediate Polars
• Classification of IGR J20084+3221 as an Intermediate Polar using X-ray and Optical Observations
• Revisiting the X-ray Emission of the Asynchronous Polar V1432 Aql
• Searching for Magnetic White Dwarfs in LAMOST DR10