A Photometric and Spectroscopic Investigation of the DB White Dwarf Population using SDSS and Gaia Data

Abstract

We present a comprehensive analysis of DB white dwarfs drawn from the Sloan Digital Sky Survey, based on model fits to $ugriz$ photometry and medium resolution spectroscopy from the SDSS. We also take advantage of the exquisite trigonometric parallax measurements recently obtained by the Gaia mission. Using the so-called photometric and spectroscopic techniques, we measure the atmospheric and physical parameters of each object in our sample ($T_{\mathrm{eff}}$, $\log g$, H/He, Ca/He, $R$, $M$), and compare the values obtained from both techniques in order to assess the precision and accuracy of each method. We then explore in great detail the surface gravity, stellar mass, and hydrogen abundance distributions of DB white dwarfs as a function of effective temperature. We present some clear evidence for a large population of unresolved double degenerate binaries composed of DB+DB and even DB+DA white dwarfs. In the light of our results, we finally discuss the spectral evolution of DB white dwarfs, in particular the evolution of the DB-to-DA ratio as a function of $T_{\mathrm{eff}}$, and we revisit the question of the origin of hydrogen in DBA white dwarfs.

arXiv comment60 pages, 25 figures. Online material: Tables 1, 2 and 3 and Figures 25 to 34 from Appendix A. Accepted for publication in The Astrophysical Journal

References in corpus (35)

• Gaia Data Release 2. Summary of the contents and survey properties
• The First Data Release of the Sloan Digital Sky Survey
• 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
• A $Gaia$ Data Release 2 catalogue of white dwarfs and a comparison with SDSS
• A Catalog of Spectroscopically Confirmed White Dwarfs from the Sloan Digital Sky Survey Data Release 4
• SDSS DR7 White Dwarf Catalog
• Magnetic White Dwarfs
• A Comprehensive Spectroscopic Analysis of DB White Dwarfs
• A Spectroscopic Survey & Analysis of Bright, Hydrogen-Rich White Dwarfs
• The Element Abundances in Bare Planetary Nebula Central Stars and the Shell Burning in AGB Stars
• New white dwarf and subdwarf stars in the Sloan Digital Sky Survey Data Release 12
• New white dwarf stars in the Sloan Digital Sky Survey Data Release 10
• Spectroscopic analysis of DA white dwarfs with 3D model atmospheres
• The White Dwarf Luminosity Function from SDSS Imaging Data
• High-resolution UVES/VLT spectra of white dwarfs observed for the ESO SN Ia Progenitor Survey. III. DA white dwarfs
• On the Measurement of Fundamental Parameters of White Dwarfs in the Gaia Era
• Rare White dwarf stars with carbon atmospheres
• An Empirical Measurement of the Initial-Final Mass Relation with Gaia White Dwarfs
• Likely detection of water-rich asteroid debris in a metal-polluted white dwarf
• Hot DQ White Dwarfs: Something Different
• Measurements of Physical Parameters of White Dwarfs: A Test of the Mass-Radius Relation
• DB white dwarfs in the Sloan Digital Sky Survey Data Release 10 and 12
• Fundamental parameter accuracy of DA and DB white dwarfs in Gaia Data Release 2
• Hydrogen delivery onto white dwarfs from remnant exo-Oort cloud comets
• Hot DB White Dwarfs from the Sloan Digital Sky Survey
• On the Spectral Evolution of Helium-Atmosphere White Dwarfs Showing Traces of Hydrogen
• Trace hydrogen in helium atmosphere white dwarfs as a possible signature of water accretion
• A Spectroscopic Analysis of White Dwarfs in the Kiso Survey
• A Refined Search for Pulsations in White Dwarf Companions to Millisecond Pulsars
• Solar Abundances of Rock Forming Elements, Extreme Oxygen and Hydrogen in a Young Polluted White Dwarf
• Pure-hydrogen 3D model atmospheres of cool white dwarfs
• Pure-helium 3D model atmospheres of white dwarfs
• Comparison of Atmospheric Parameters Determined from Spectroscopy and Photometry for DA White Dwarfs in the Sloan Digital Sky Survey
• Spectroscopic Analysis of the White Dwarf KUV 02196+2816: A New Unresolved DA+DB Degenerate Binary

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• The Canada-France Imaging Survey: Reconstructing the Milky Way Star Formation History from its White Dwarf Population
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• Spectral classification of the 100 pc white dwarf population from Gaia-DR3 and the Virtual Observatory
• The formation of neutron star systems through accretion-induced collapse in white-dwarf binaries
• From Hydrogen to Helium: The Spectral Evolution of White Dwarfs as Evidence for Convective Mixing
• A Spectro-photometric Analysis of Cool White Dwarfs in the Gaia and Pan-STARRS Footprint
• The Most Massive White Dwarfs in the Solar Neighborhood
• Serendipitous Discovery of Nine White Dwarfs With Gaseous Debris Disks
• 3D spectroscopic analysis of helium-line white dwarfs
• The Merger Fraction of Ultramassive White Dwarfs
• On the Spectral Evolution of Hot White Dwarf Stars. III. The PG 1159$-$DO$-$DB$-$DQ Evolutionary Channel Revisited
• On the Spectral Evolution of Hot White Dwarf Stars. II. Time-dependent Simulations of Element Transport in Evolving White Dwarfs with STELUM
• The spectral evolution of white dwarfs: where do we stand?
• J-PLUS: Spectral evolution of white dwarfs by PDF analysis
• The formation of single neutron-stars from double white-dwarf mergers via accretion-induced collapse
• Carbon dredge-up required to explain the Gaia white dwarf colour-magnitude bifurcation
• PEWDD: A database of white dwarfs enriched by exo-planetary material
• CatNorth: An Improved Gaia DR3 Quasar Candidate Catalog with Pan-STARRS1 and CatWISE
• White dwarf spectral type-temperature distribution from Gaia-DR3 and the Virtual Observatory
• On the Spectral Evolution of Hot White Dwarf Stars. IV. The Diffusion and Mixing of Residual Hydrogen in Helium-rich White Dwarfs
• Systematic uncertainties in the characterisation of helium-dominated metal-polluted white dwarf atmospheres
• The ubiquity of carbon dredge-up in hydrogen-deficient white dwarfs as revealed by GALEX
• The Initial-Final Mass Relation for Hydrogen-Deficient White Dwarfs
• Atmospheric Temperature Inversions and He I 5876 Core Profile Structure in White Dwarfs
• The Pulsating Helium-Atmosphere White Dwarfs I: New DBVs from the Sloan Digital Sky Survey
• New Calculations of Stark Broadened Profiles for Neutral Helium Lines Using Computer Simulations
• A GALEX view of the DA White Dwarf Population
• Host-star and exoplanet composition: Polluted white dwarf reveals depletion of moderately refractory elements in planetary material
• On the formation of hydrogen-deficient low-mass white dwarfs
• Do White Dwarfs Sample Water-Rich Planetary Material?
• Double-faced white dwarfs and the magnetic inhibition of convection
• Exploring faint white dwarfs and the luminosity function with Subaru HSC and SDSS in Stripe 82
• Improving white dwarfs as chronometers with Gaia parallaxes and spectroscopic metallicities
• A new method to retrieve the star formation history from white dwarf luminosity functions -- an application to the Gaia catalogue of nearby stars