Effective Temperatures of Cataclysmic Variable White Dwarfs as a Probe of their Evolution

Abstract

We present HST spectroscopy for 45 cataclysmic variables (CVs), observed with HST/COS and HST/STIS. For 36 CVs, the white dwarf is recognisable through its broad Ly$\alpha$ absorption profile and we measure the white dwarf effective temperatures ($T_{\mathrm{eff}}$) by fitting the HST data assuming $\log g=8.35$, which corresponds to the average mass for CV white dwarfs ($\simeq 0.8{\mathrm{M}}_{\odot }$). Our results nearly double the number of CV white dwarfs with an accurate temperature measurement. We find that CVs above the period gap have, on average, higher temperatures ($⟨T_{\mathrm{eff}}⟩\simeq 23000$K) and exhibit much more scatter compared to those below the gap ($⟨T_{\mathrm{eff}}⟩\simeq 15000$K). While this behaviour broadly agrees with theoretical predictions, some discrepancies are present: (i) all our new measurements above the gap are characterised by lower temperatures ($T_{\mathrm{eff}}\simeq 16000-26000$K) than predicted by the present day CV population models ($T_{\mathrm{eff}}\simeq 38000-43000$K); (ii) our results below the gap are not clustered in the predicted narrow track and exhibit in particular a relatively large spread near the period minimum, which may point to some shortcomings in the CV evolutionary models. Finally, in the standard model of CV evolution, reaching the minimum period, CVs are expected to evolve back towards longer periods with mean accretion rates $\dot{M}\lesssim 2\times 10^{-11}{\mathrm{M}}_{\odot }{\mathrm{yr}}^{-1}$, corresponding to $T_{\mathrm{eff}}\lesssim 11500$K. We do not unambiguously identify any such system in our survey, suggesting that this major component of the predicted CV population still remains elusive to observations.

26 pages, 21 figures. Published in MNRAS

References in corpus (81)

• Modules for Experiments in Stellar Astrophysics (MESA): Binaries, Pulsations, and Explosions
• Catalogue of cataclysmic binaries, low-mass X-ray binaries and related objects (Seventh edition)
• The Evolution of Cataclysmic Variables as Revealed by their Donor Stars
• A Three-Dimensional Map of Milky-Way Dust
• The Formation Rate, Mass and Luminosity Functions of DA White Dwarfs from the Palomar Green Survey
• An Improved Spectroscopic Analysis of DA White Dwarfs from the Sloan Digital Sky Survey Data Release 4
• Magnetic White Dwarfs
• A Comprehensive Spectroscopic Analysis of DB White Dwarfs
• The Donor Stars of Cataclysmic Variables
• White Dwarf Mass Distribution in the SDSS
• An Exploration of the Paradigm for the 2-3 Hour Period Gap in Cataclysmic Variables
• Found: The missing blue opacity in atmosphere models of cool hydrogen white dwarfs
• SDSS unveils a population of intrinsically faint cataclysmic variables at the minimum orbital period
• Chromospheric Activity, Rotation, and Rotational Braking in M and L Dwarfs
• 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
• Cataclysmic Variable Primary Effective Temperatures: Constraints on Binary Angular Momentum Loss
• Theoretical Modeling of the Thermal State of Accreting White Dwarfs Undergoing Classical Novae
• On the evolutionary status of short period cataclysmic variables
• Three in one go: consequential angular momentum loss can solve major problems of CV evolution
• Measuring White Dwarf Accretion Rates via their Effective Temperatures
• HS2331+3905: The cataclysmic variable that has it all
• Anomalous ultraviolet line flux ratios in the cataclysmic variables 1RXSJ232953.9+062814, CE315, BZ UMa and EY Cyg observed with HST/STIS
• Parallax and Distance Estimates for Fourteen Cataclysmic Variable Stars
• Population Synthesis of Cataclysmic Variables: I. Inclusion of Detailed Nuclear Evolution
• Growing White Dwarfs to the Chandrasekhar Limit: The Parameter Space of the Single Degenerate SNIa Channel
• Far-ultraviolet Spectroscopy of Magnetic Cataclysmic Variables
• Accretion disc outbursts: a new version of an old model
• A brown dwarf mass donor in an accreting binary
• Cataclysmic Variables below the Period Gap: Mass Determinations of 14 Eclipsing Systems
• CV evolution: AM Her binaries and the period gap
• HST Spectra of GW Librae: A Hot Pulsating White Dwarf in a Cataclysmic Variable
• The Dwarf Novae of Shortest Period
• The formation of Cataclysmic Variables: the influence of nova eruptions
• FUSE and HST/STIS far-ultraviolet observations of AM Herculis in an extended low state
• Anomalous cooling of the massive white dwarf in U Geminorum following a narrow dwarf nova outburst
• A Thousand and One Nova Outbursts
• A Self-Occulting Accretion Disk in the SW Sex Star DW UMa
• Delays in dwarf novae I: The case of SS Cygni
• QZ Serpentis: A Dwarf Nova with a 2-Hour Orbital Period and an Anomalously Hot, Bright Secondary Star
• The system parameters of DW Ursae Majoris
• The accreting white dwarfs in BW Scl, BC UMa and SW UMa
• Pulsations, Boundary Layers, and Period Bounce in the Cataclysmic Variable RE J1255+266
• ULTRACAM photometry of the eclipsing cataclysmic variables XZ Eri and DV UMa
• Finding the Instability Strip for Accreting Pulsating White Dwarfs from HST and Optical Observations
• ULTRACAM photometry of the eclipsing cataclysmic variables GY Cnc, IR Com and HT Cas
• White dwarf masses in cataclysmic variables
• Dwarf novae in the Hamburg Quasar Survey: Rarer than expected
• White Dwarf Heating and Subsequent Cooling in Dwarf Nova Outbursts
• Delays in dwarf novae: VW Hyi, the tidal instability and enhanced mass transfer models
• High-speed energy-resolved STJ photometry of the eclipsing dwarf nova IY UMa
• SDSS J123813.73-033933.0, a cataclysmic variable evolved beyond the period minimum
• Hubble Space Telescope STIS Spectroscopy of Long Period Dwarf Novae in Quiescence
• Orbital periods of cataclysmic variables identified by the SDSS. VI. The 4.5-hr period eclipsing system SDSS J100658.40+233724.4
• Far Ultraviolet Observations of the Dwarf Nova VW Hyi in Quiescence
• Spectroscopy and orbital periods of four cataclysmic variable stars
• A search for brown-dwarf like secondaries in cataclysmic variables
• HST and Optical Data Reveal White Dwarf Cooling, Spin and Periodicities in GW Librae 3-4 Years after Outburst
• SDSSJ001153.08-064739.2, a cataclysmic variable with an evolved donor in the period gap
• Discovery of a cataclysmic variable with a sub-stellar companion
• Orbital periods of cataclysmic variables identified by the SDSS. V. VLT, NTT and Magellan observations of nine equatorial systems
• The Recently-Discovered Dwarf Nova System ASAS J002511+1217.2: A New WZ Sagittae Star
• Five Dwarf Novae with Orbital Periods Below Two Hours
• The mass of the white dwarf in GW Libra
• The Effect of a Superoutburst on the White Dwarf and Disk of VW Hydri as observed with FUSE
• An evolved donor star in the long-period cataclysmic variable HS 0218+3229
• GW Librae: A unique laboratory for pulsations in an accreting white dwarf
• GALEX and Optical Observations of GW Librae During the Long Decline from Superoutburst
• On the orbital period of the cataclysmic variable RZ Leonis
• Time-resolved photometry and spectroscopy of the new deeply-eclipsing SW Sextantis star HS 0728+6738
• The Nova-like Variables
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• The fight for accretion: discovery of intermittent mass transfer in BB Doradus in the low state
• V405 Peg (RBS 1955): A Nearby, Low-Luminosity Cataclysmic Binary
• Dwarf Novae in the Shortest Orbital Period Regime: II. WZ Sge Stars as the Missing Population near the Period Minimum
• Long-term monitoring of the short period SU UMa-type dwarf nova, V844 Herculis
• A photometric study of the newly discovered eclipsing cataclysmic variable SDSS J040714.78-064425.1
• GW Librae: Still Hot Eight Years Post-Outburst
• A New Cataclysmic Variable in Hercules
• The 2005 July Superoutburst of the Dwarf Nova 2QZ J021927.9-304545: the SU UMa Nature Confirmed
• Hubble Space Telescope Cosmic Origins Spectrograph Spectroscopy of the Southern Nova-like BB Doradus in an Intermediate State

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• Hubble Space Telescope Ultraviolet Light Curves Reveal Interesting Properties of CC Sculptoris and RZ Leonis
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• White Dwarf Photospheric Abundances in Cataclysmic Variables: I. SS Aurigae and TU Mensae
• White Dwarf Photospheric Abundances in Cataclysmic Variables -- II. White Dwarfs With and Without a Mask
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• The C/N ratio from FUV spectroscopy as a constraint upon the past evolution of HS0218+3229
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• A systematic study of spiral density waves in the accretion discs of Cataclysmic Variables
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• The evolutionary history of ultra-compact accreting binaries. I. Chemical abundances and formation channel of the eclipsing AM CVn system ZTF J225237.05-051917.4 from HST spectroscopy
• White Dwarf Mass Growth in Cataclysmic Variables: Roles of Dwarf Novae
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