A $Gaia$ Data Release 2 catalogue of white dwarfs and a comparison with SDSS

Abstract

We present a catalogue of white dwarf candidates selected from the second data release of $Gaia$ (DR2). We used a sample of spectroscopically confirmed white dwarfs from the Sloan Digital Sky Survey (SDSS) to map the entire space spanned by these objects in the $Gaia$ Hertzsprung-Russell diagram. We then defined a set of cuts in absolute magnitude, colour, and a number of $Gaia$ quality flags to remove the majority of contaminating objects. Finally, we adopt a method analogous to the one presented in our earlier SDSS photometric catalogues to calculate a probability of being a white dwarf ($P_{\mathrm{WD}}$) for all $Gaia$ sources which passed the initial selection. The final catalogue is composed of $486641$ stars with calculated $P_{\mathrm{WD}}$ from which it is possible to select a sample of $\simeq 260000$ high-confidence white dwarf candidates in the magnitude range $8<G<21$. By comparing this catalogue with a sample of SDSS white dwarf candidates we estimate an upper limit in completeness of $85$ per cent for white dwarfs with $G\le 20$ mag and $T_{\mathrm{eff}}>7000$ K, at high Galactic latitudes ($|b|>20^{\circ }$). However, the completeness drops at low Galactic latitudes, and the magnitude limit of the catalogue varies significantly across the sky as a function of $Gaia$'s scanning law. We also provide the list of objects within our sample with available SDSS spectroscopy. We use this spectroscopic sample to characterise the observed structure of the white dwarf distribution in the H-R diagram.

arXiv comment23 pages, 21 figures, 4 tables. Accepted for publication in MNRAS. Version 3 accepted. Gaia DR2 catalogue of white dwarf candidates available <https://warwick.ac.uk/fac/sci/physics/research/astro/research/catalogues/gaia_dr2_white_dwarf_candidates_v2.csv>. SDSS spectra sample available <https://warwick.ac.uk/fac/sci/physics/research/astro/research/catalogues/gaia-sdss_white_dwarf_catalogue_v2.csv>

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• The miniJPAS survey: White dwarf science with 56 optical filters
• A half-ring of ionized circumstellar material trapped in the magnetosphere of a white dwarf merger remnant
• Prospects for the Observation of Continuous Gravitational Waves from Deformed Fast-spinning White Dwarfs
• Exploring the internal rotation of the extremely low-mass He-core white dwarf GD 278 with TESS asteroseismology
• White dwarf constraints on geological processes at the population level
• Seismology and diffusion of ultramassive white dwarf magnetic fields
• Orbital inclination of astrometric binaries and the dearth of face-on orbits in Gaia DR3 solutions
• A candidate giant planet companion to the massive, young white dwarf GALEX J071816.4+373139 informs the occurrence of giant planets orbiting B stars
• A Search for Pulsar Companions Around Low-Mass White Dwarfs
• On the formation of hydrogen-deficient low-mass white dwarfs
• White Dwarf Stars in the Big Data Era
• Diversity of Exoplanets
• The effects of unresolved double-degenerates in the white dwarf luminosity function
• Do White Dwarfs Sample Water-Rich Planetary Material?
• The Search for Planet and Planetesimal Transits of White Dwarfs with the Zwicky Transient Facility
• Searching for white dwarf variables in TESS data
• The CUBES Science Case
• Search of nearby resolved neutron stars among optical sources
• Serendipitous observation of a white dwarf companion to a JWST/MIRI coronagraphic calibrator
• A Mass Transferring Brown Dwarf Binary on a 57 Minute Orbit
• Identifying highly magnetized white dwarfs: A dimensionality reduction framework for estimating magnetic fields
• Ultra low-mass and small-radius white dwarfs made of heavy elements
• Inferring properties of the local white dwarf population in astrometric and photometric surveys
• eROSITA-selection of new period-bounce Cataclysmic Variables: First follow-up confirmation using TESS and SDSS
• Revisiting the Galactic age-metallicity relation from wide white dwarf-main-sequence binaries
• J-PLUS: Understanding outlier white dwarfs in the third data release via dimensionality reduction
• Astroparticle physics with compact objects
• KMT-2025-BLG-1314 and KMT-2025-BLG-1392: two microlensing planetary/brown-dwarf candidates analyzed with differentiable code
• J-PLUS: Systematic impact of metallicity on photometric calibration with the stellar locus
• Detection and Preliminary Characterisation of Polluted White Dwarfs from Gaia EDR3 and LAMOST
• A double debris disc around a white dwarf sculpted by two planetary bodies
• Modeling Circumstellar Gas Emission around a White Dwarf Using Cloudy
• I Can Do It With A Broken Planetesimal: Characterising the planetary debris in heavily polluted cool white dwarfs
• New population synthesis approach:The golden path to constrain stellar andgalactic physics
• A new method to retrieve the star formation history from white dwarf luminosity functions -- an application to the Gaia catalogue of nearby stars
• Hot Degenerates in the MCT Survey. III. A Sample of White Dwarf Stars in the Southern Hemisphere