The population of white dwarf-main sequence binaries in the SDSS DR 12

Abstract

We present a Monte Carlo population synthesis study of white dwarf-main sequence (WD+MS) binaries in the Galactic disk aimed at reproducing the ensemble properties of the entire population observed by the Sloan Digital Sky Survey (SDSS) Data Release 12. Our simulations take into account all known observational biases and use the most up-to-date stellar evolutionary models. This allows us to perform a sound comparison between the simulations and the observational data. We find that the properties of the simulated and observed parameter distributions agree best when assuming low values of the common envelope efficiency (0.2-0.3), a result that is in agreement with previous findings obtained by observational and population synthesis studies of close SDSS WD+MS binaries. We also show that all synthetic populations that result from adopting an initial mass ratio distribution with a positive slope are excluded by observations. Finally, we confirm that the properties of the simulated WD+MS binary populations are nearly independent of the age adopted for the thin disk, on the contribution of WD+MS binaries from the thick disk (0-17 per cent of the total population) and on the assumed fraction of the internal energy that is used to eject the envelope during the common envelope phase (0.1-0.5).

accepted for publication by MNRAS

References in corpus (19)

• Binary interaction dominates the evolution of massive stars
• New evolutionary models for pre-main sequence and main sequence low-mass stars down to the hydrogen-burning limit
• Empirical Color Transformations Between SDSS Photometry and Other Photometric Systems
• Post-common-envelope binaries from SDSS. IX: Constraining the common-envelope efficiency
• The initial-final mass relationship of white dwarfs revisited: effect on the luminosity function and mass distribution
• The UKIRT Infrared Deep Sky Survey Early Data Release
• Hubble Space Telescope NICMOS Observations of T Dwarfs: Brown Dwarf Multiplicity and New Probes of the L/T Transition
• Post Common Envelope Binaries from SDSS. I: 101 white dwarf main sequence binaries with multiple SDSS spectroscopy
• Monte Carlo simulations of post-common-envelope white dwarf + main sequence binaries: comparison with the SDSS DR7 observed sample
• Post Common Envelope Binaries from SDSS. V: Four eclipsing white dwarf main sequence binaries
• Monte Carlo simulations of post-common-envelope white dwarf + main sequence binaries: The effects of including recombination energy
• A New Gravitational Wave Verification Source
• What a Local Sample of Spectroscopic Binaries can tell us about the Field-Binary Population
• Fourteen new eclipsing white dwarf plus main-sequence binaries from the SDSS and Catalina surveys
• Post common envelope binaries from SDSS. IV: SDSSJ121258.25-012310.1, a new eclipsing system
• The age-metallicity relation in the solar neighbourhood from a pilot sample of white dwarf-main sequence binaries
• White dwarf-main sequence binaries from LAMOST: the DR1 catalogue
• The evolution of the self-lensing binary KOI-3278: evidence of extra energy sources during CE evolution
• The effects of metallicity on the Galactic disk population of white dwarfs

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• Searching for compact objects in binaries with Gaia DR3
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