The DESI Early Data Release white dwarf catalogue

Manser, Christopher J.; Izquierdo, Paula; Gänsicke, Boris T.; Swan, Andrew; Koester, Detlev; Robert, Akshay; Xu, Siyi; Inight, Keith; Amroota, Ben; Fusillo, N. P. Gentile; Koposov, Sergey E.; Kim, Bokyoung; Dey, Arjun; Prieto, Carlos Allende; Aguilar, J.; Ahlen, S.; Blum, R.; Brooks, D.; Claybaugh, T.; Cooper, A. P.; Dawson, K.; de la Macorra, A.; Doel, P.; Forero-Romero, J. E.; Gaztañaga, E.; Gontcho, S. Gontcho A.; Honscheid, K.; Kisner, T.; Kremin, A.; Lambert, A.; Landriau, M.; Le Guillou, L.; Levi, Michael E.; Li, T. S.; Meisner, A.; Miquel, R.; Moustakas, J.; Nie, J.; Palanque-Delabrouille, N.; Percival, W. J.; Poppett, C.; Prada, F.; Rezaie, M.; Rossi, G.; Sanchez, E.; Schlafly, E. F.; Schlegel, D.; Schubnell, M.; Seo, H.; Silber, J.; Tarlé, G.; Weaver, B. A.; Zhou, Z.; Zou, H.

doi:10.1093/mnras/stae2205

Title: The DESI Early Data Release white dwarf catalogue

Journal Article · 24 September 2024 · Monthly Notices of the Royal Astronomical Society

DOI: https://doi.org/10.1093/mnras/stae2205 · OSTI ID:2475248

;

; Amroota, Ben;

;

; Dey, Arjun; Prieto, Carlos Allende; Aguilar, J.; Ahlen, S.; Blum, R.; Brooks, D.; Claybaugh, T.;

ABSTRACT The Early Data Release (EDR) of the Dark Energy Spectroscopic Instrument (DESI) comprises spectroscopy obtained from 2020 December 14 to 2021 June 10. White dwarfs were targeted by DESI both as calibration sources and as science targets and were selected based on Gaia photometry and astrometry. Here, we present the DESI EDR white dwarf catalogue, which includes 2706 spectroscopically confirmed white dwarfs of which approximately 60 per cent have been spectroscopically observed for the first time, as well as 66 white dwarf binary systems. We provide spectral classifications for all white dwarfs, and discuss their distribution within the Gaia Hertzsprung–Russell diagram. We provide atmospheric parameters derived from spectroscopic and photometric fits for white dwarfs with pure hydrogen or helium photospheres, a mixture of those two, and white dwarfs displaying carbon features in their spectra. We also discuss the less abundant systems in the sample, such as those with magnetic fields, and cataclysmic variables. The DESI EDR white dwarf sample is significantly less biased than the sample observed by the Sloan Digital Sky Survey, which is skewed to bluer and therefore hotter white dwarfs, making DESI more complete and suitable for performing statistical studies of white dwarfs.

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Sponsoring Organization:: USDOE

OSTI ID:: 2475248

Journal Information:: Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Journal Issue: 1 Vol. 535; ISSN 0035-8711

Publisher:: Oxford University PressCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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The Q Branch Cooling Anomaly Can Be Explained by Mergers of White Dwarfs and Subgiant Stars Shen, Ken J.; Blouin, Simon; Breivik, Katelyn arXiv https://doi.org/10.48550/arXiv.2308.04559	preprint	January 2023
White Dwarf Merger Remnants: The DAQ Subclass Kilic, Mukremin; Bergeron, Pierre; Blouin, Simon arXiv https://doi.org/10.48550/arXiv.2403.08878	preprint	January 2024

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