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

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journal contribution
posted on 26.05.2021, 12:00 by Nicola Pietro Gentile Fusillo, Pier-Emmanuel Tremblay, Boris T Gänsicke, Christopher J Manser, Tim Cunningham, Elena Cukanovaite, Mark Hollands, Thomas Marsh, Roberto Raddi, Stefan Jordan, Silvia Toonen, Stephan Geier, Martin Barstow, Jeffrey D Cummings
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 (PWD) for all Gaia sources that passed the initial selection. The final catalogue is composed of 486641 stars with calculated PWD from which it is possible to select a sample of ≃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 ≤ 20 mag and Teff >7000 K, at high Galactic latitudes (|b| > 20°). 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 characterize the observed structure of the white dwarf distribution in the H–R diagram.

History

Citation

Monthly Notices of the Royal Astronomical Society, Volume 482, Issue 4, February 2019, Pages 4570–4591, https://doi.org/10.1093/mnras/sty3016

Author affiliation

Department of Physics and Astronomy

Version

VoR (Version of Record)

Published in

Monthly Notices of the Royal Astronomical Society

Volume

482

Issue

4

Pagination

4570 - 4591

Publisher

Oxford University Press (OUP)

issn

0035-8711

eissn

1365-2966

Acceptance date

29/10/2018

Copyright date

2018

Available date

26/05/2021

Language

en

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