$\text{Gaia}$ white dwarfs within 40 pc III: spectroscopic observations of new candidates in the southern hemisphere

Abstract

We present a spectroscopic survey of 248 white dwarf candidates within 40 pc of the Sun; of these 244 are in the southern hemisphere. Observations were performed mostly with the Very Large Telescope (X-Shooter) and Southern Astrophysical Research Telescope. Almost all candidates were selected from $\text{Gaia}$ Data Release 3 (DR3). We find a total of 246 confirmed white dwarfs, 209 of which had no previously published spectra, and two main-sequence star contaminants. Of these, 100 white dwarfs display hydrogen Balmer lines, 69 have featureless spectra, and two show only neutral helium lines. Additionally, 14 white dwarfs display traces of carbon, while 37 have traces of other elements that are heavier than helium. We observe 36 magnetic white dwarfs through the detection of Zeeman splitting of their hydrogen Balmer or metal spectral lines. High spectroscopic completeness (> 97 per cent) has now been reached, such that we have 1058 confirmed $\text{Gaia}$ DR3 white dwarfs out of 1083 candidates within 40 pc of the Sun at all declinations.

arXiv comment49 pages, 19 figures. Accepted by MNRAS on 8 November, 2022

References in corpus (84)

• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• The Galaxy Evolution Explorer: A Space Ultraviolet Survey Mission
• Comprehensive analytic formulae for stellar evolution as a function of mass and metallicity
• The Sixteenth Data Release of the Sloan Digital Sky Surveys: First Release from the APOGEE-2 Southern Survey and Full Release of eBOSS Spectra
• X-shooter, the new wide band intermediate resolution spectrograph at the ESO Very Large Telescope
• Molecfit: A general tool for telluric absorption correction. I. Method and application to ESO instruments
• Automated data reduction workflows for astronomy
• Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 parsecs: The Southern Sample
• Molecfit: A general tool for telluric absorption correction II. Quantitative evaluation on ESO-VLT X-Shooter spectra
• 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
• SDSS DR7 White Dwarf Catalog
• Photometric and Spectroscopic Analysis of Cool White Dwarfs with Trigonometric Parallax Measurements
• Unresolved stellar companions with Gaia DR2 astrometry
• A Comprehensive Spectroscopic Analysis of DB White Dwarfs
• A Spectroscopic Survey & Analysis of Bright, Hydrogen-Rich White Dwarfs
• The Chemical Composition of an Extrasolar Minor Planet
• A catalogue of white dwarfs in Gaia EDR3
• On the Spectral Evolution of Hot White Dwarf Stars. I. A Detailed Model-Atmosphere Analysis of Hot White Dwarfs from SDSS DR12
• The White Dwarf Initial-Final Mass Relation for Progenitor Stars From 0.85 to 7.5 M${}_{\odot }$
• 4MOST: Project overview and information for the First Call for Proposals
• Trumpeting M Dwarfs with CONCH-SHELL: a Catalog of Nearby Cool Host-Stars for Habitable ExopLanets and Life
• Circumstellar Debris and Pollution at White Dwarf Stars
• Know Your Neighborhood: A Detailed Model Atmosphere Analysis of Nearby White Dwarfs
• Spectroscopic analysis of DA white dwarfs with 3D model atmospheres
• Models of low-mass helium white dwarfs including gravitational settling, thermal and chemical diffusion, and rotational mixing
• The binarity of the local white dwarf population
• On the Measurement of Fundamental Parameters of White Dwarfs in the Gaia Era
• Rare White dwarf stars with carbon atmospheres
• A Determination of the Local Density of White Dwarf Stars
• The Gaia 20 pc white dwarf sample
• Detailed Spectroscopic and Photometric Analysis of DQ White Dwarfs
• A cooling anomaly of high-mass white dwarfs
• Analysis of Helium-Rich White Dwarfs Polluted by Heavy Elements in the Gaia Era
• An Empirical Measurement of the Initial-Final Mass Relation with Gaia White Dwarfs
• Magnetic fields in isolated and interacting white dwarfs
• The origin and evolution of magnetic white dwarfs in close binary stars
• $Gaia$ white dwarfs within 40 pc II: the volume-limited northern hemisphere sample
• Analysis of hydrogen-rich magnetic white dwarfs detected in the Sloan Digital Sky Survey
• 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
• Cool DZ white dwarfs I: Identification and spectral analysis
• The AllWISE Motion Survey, Part 2
• A New Generation of Cool White Dwarf Atmosphere Models. IV. Revisiting the Spectral Evolution of Cool White Dwarfs
• On the Spectral Evolution of Helium-Atmosphere White Dwarfs Showing Traces of Hydrogen
• New insight into the magnetism of degenerate stars from the analysis of a volume limited sample of white dwarfs
• New white dwarf envelope models and diffusion. Application to DQ white dwarfs
• $\text{Gaia}$ white dwarfs within 40 pc I: spectroscopic observations of new candidates
• The Canada-France Imaging Survey: Reconstructing the Milky Way Star Formation History from its White Dwarf Population
• New ultra-cool and brown dwarf candidates in Gaia DR2
• Multiple channels for the onset of magnetism in isolated white dwarfs
• The Occurrence of Wide-Orbit Planets in Binary Star Systems
• Solution to the problem of the surface gravity distribution of cool DA white dwarfs from improved 3D model atmospheres
• The Solar Neighborhood. XXXIX. Parallax Results from the CTIOPI and NOFS Programs: 50 New Members of the 25 Parsec White Dwarf Sample
• An ultra-massive white dwarf with a mixed hydrogen-carbon atmosphere as a likely merger remnant
• A study of high proper-motion white dwarfs I. Spectropolarimetry of a cool hydrogen-rich sample
• Constraints on the origin of the massive, hot, and rapidly rotating magnetic white dwarf RE J 0317-853 from an HST parallax measurement
• A white dwarf accreting planetary material determined from X-ray observations
• The Solar Neighborhood. XIX. Discovery and Characterization of 33 New Nearby White Dwarf Systems
• Alkali metals in white dwarf atmospheres as tracers of ancient planetary crusts
• Carbon-rich (DQ) white dwarfs in the Sloan Digital Sky Survey
• 3D spectroscopic analysis of helium-line white dwarfs
• The Solar Neighborhood. XX. Discovery and Characterization of 21 New Nearby White Dwarf Systems
• Discovery of six new strongly magnetic white dwarfs in the 20 pc local population
• On the Spectral Evolution of Hot White Dwarf Stars. III. The PG 1159$-$DO$-$DB$-$DQ Evolutionary Channel Revisited
• Lithium pollution of a white dwarf records the accretion of an extrasolar planetesimal
• Spectral analysis of ultra-cool white dwarfs polluted by planetary debris
• On the Nature of Ultracool White Dwarfs: Not so Cool Afterall
• Variability in Hot Carbon-Dominated Atmosphere (hot DQ) White Dwarfs: Rapid Rotation?
• C_2 in Peculiar DQ White Dwarfs
• Improved Constraints on the Initial-to-Final Mass Relation of White Dwarfs using Wide Binaries
• The cool magnetic DAZ white dwarf NLTT 10480
• Multi-band photometry and spectroscopy of an all-sky sample of bright white dwarfs
• A new weak-field magnetic DA white dwarf in the local 20 pc volume. The frequency of magnetic fields in DA stars
• A New Generation of Cool White Dwarf Atmosphere Models. III. WD J2356$-$209: Accretion of a Planetesimal with an Unusual Composition
• Cool white dwarfs as standards for infrared observations
• Magnetic dynamos in white dwarfs -- II. Relating magnetism and pollution
• Two new Double-lined Spectroscopic Binary White Dwarfs
• 4MOST Consortium Survey 3: Milky Way Disc and Bulge Low-Resolution Survey (4MIDABLE-LR)
• Spectral analysis of cool white dwarfs accreting from planetary systems: from the UV to the optical
• The Initial-Final Mass Relation for Hydrogen-Deficient White Dwarfs
• Missing metals in DQ stars: A simple explanation

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• The 40 pc sample of white dwarfs from Gaia
• A Spectro-photometric Analysis of Cool White Dwarfs in the Gaia and Pan-STARRS Footprint
• The spectral evolution of white dwarfs: where do we stand?
• Local stellar formation history from the 40 pc white dwarf sample
• White dwarf Random Forest classification through Gaia spectral coefficients
• The PLATO field selection process. II. Characterization of LOPS2, the first long-pointing field
• Carbon dredge-up required to explain the Gaia white dwarf colour-magnitude bifurcation
• PEWDD: A database of white dwarfs enriched by exo-planetary material
• DAHe white dwarfs from the DESI survey
• A Deficit of Massive White Dwarfs in Gaia Astrometric Binaries
• The ubiquity of carbon dredge-up in hydrogen-deficient white dwarfs as revealed by GALEX
• Photometric White Dwarf Rotation
• A Random Forest spectral classification of the Gaia 500-pc white dwarf population
• A cool, magnetic white dwarf accreting planetary debris
• An emerging and enigmatic spectral class of isolated DAe white dwarfs
• Identification of new nearby white dwarfs using Gaia DR3
• Can tidal evolution lead to close-in planetary bodies around white dwarfs I: Orbital period distribution
• Can tidal evolution lead to close-in planetary bodies around white dwarfs II: volcanism and transits
• Characterizing planetary material accreted by cool helium atmosphere white dwarfs using an exponentially decaying disc model
• White dwarf constraints on geological processes at the population level
• J-PLUS: The fraction of calcium white dwarfs along the cooling sequence
• I Can Do It With A Broken Planetesimal: Characterising the planetary debris in heavily polluted cool white dwarfs
• Detection of a weak magnetic field in the Balmer emission line white dwarf WDJ1653-1001
• J-PLUS: Understanding outlier white dwarfs in the third data release via dimensionality reduction