The Solar Neighborhood. XXXIX. Parallax Results from the CTIOPI and NOFS Programs: 50 New Members of the 25 Parsec White Dwarf Sample

Abstract

We present 114 trigonometric parallaxes for 107 nearby white dwarf (WD) systems from both the Cerro Tololo Inter-American Observatory Parallax Investigation (CTIOPI) and the U. S. Naval Observatory Flagstaff Station (NOFS) parallax programs. Of these, 76 parallaxes for 69 systems were measured by the CTIOPI program and 38 parallaxes for as many systems were measured by the NOFS program. A total of 50 systems are confirmed to be within the 25 pc horizon of interest. Coupled with a spectroscopic confirmation of a common proper motion companion to a Hipparcos star within 25 pc as well as confirmation parallax determinations for two WD systems included in the recently released Tycho Gaia Astrometric Solution (TGAS) catalog, we add 53 new systems to the 25 pc WD sample $-$ a 42% increase. Our sample presented here includes four strong candidate halo systems, a new metal-rich DAZ WD, a confirmation of a recently discovered nearby short-period (P = 2.85 hr) double degenerate, a WD with a new astrometric pertubation (long period, unconstrained with our data), and a new triple system where the WD companion main-sequence star has an astrometric perturbation (P $\sim$ 1.6 yr).

32 pages, 12 figures. Figure 4 in the manuscript is a representative set of plots - plots for all WDs presented here are available (allfits_photo.pdf, allfits_photo_DQ.pdf, and allfits_photo_DZ.pdf). Accepted for publication in The Astronomical Journal

References in corpus (17)

• The Gaia mission
• The UKIRT Infrared Deep Sky Survey (UKIDSS)
• Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties
• Gaia Data Release 1: Astrometry - one billion positions, two million proper motions and parallaxes
• The WFCAM Science Archive
• The UKIRT Wide Field Camera ZYJHK Photometric System: Calibration from 2MASS
• Spectropolarimetric Survey of Hydrogen-rich White Dwarf Stars
• On the Spectral Evolution of Cool, Helium-Atmosphere White Dwarfs: Detailed Spectroscopic and Photometric Analysis of DZ Stars
• Gl86B: a white dwarf orbits an exoplanet host star
• The Solar Neighborhood. XXI. Parallax Results from the CTIOPI 0.9m Program: 20 New Members of the 25 Parsec White Dwarf Sample
• Spectroscopic Identification of Cool White Dwarfs in the Solar Neighbourhood
• New Neighbors: Parallaxes of 18 nearby stars selected from the LSPM-north catalog
• The Solar Neighborhood. XIX. Discovery and Characterization of 33 New Nearby White Dwarf Systems
• The Solar Neighborhood. XX. Discovery and Characterization of 21 New Nearby White Dwarf Systems
• Ultracool white dwarfs and the age of the Galactic disc
• Trigonometric parallaxes of high velocity halo white dwarf candidates
• A New Merging Double Degenerate Binary in the Solar Neighborhood

Cited by in corpus (28)

• Gaia Data Release 3: Stellar multiplicity, a teaser for the hidden treasure
• The 10 parsec sample in the Gaia era
• $Gaia$ white dwarfs within 40 pc II: the volume-limited northern hemisphere sample
• Measurements of Physical Parameters of White Dwarfs: A Test of the Mass-Radius Relation
• The 40 pc sample of white dwarfs from Gaia
• A New Generation of Cool White Dwarf Atmosphere Models. IV. Revisiting the Spectral Evolution of Cool White Dwarfs
• New insight into the magnetism of degenerate stars from the analysis of a volume limited sample of white dwarfs
• $\text{Gaia}$ white dwarfs within 40 pc I: spectroscopic observations of new candidates
• $\text{Gaia}$ white dwarfs within 40 pc III: spectroscopic observations of new candidates in the southern hemisphere
• The Volume-Complete Sample of M Dwarfs with Masses 0.1 <= M/M_sol <= 0.3 within 15 Parsecs
• Discovery of six new strongly magnetic white dwarfs in the 20 pc local population
• Magnetism, X-rays, and Accretion Rates in WD 1145+017 and other Polluted White Dwarf Systems
• No evidence for a strong decrease of planetesimal accretion in old white dwarfs
• The spectral evolution of white dwarfs: where do we stand?
• First semi-empirical test of the white dwarf mass-radius relationship using a single white dwarf via astrometric microlensing
• PEWDD: A database of white dwarfs enriched by exo-planetary material
• The Solar Neighborhood. XLVI. Revealing New M Dwarf Binaries and their Orbital Architectures
• A Characterization of the Circumstellar Gas around WD 1124-293 using Cloudy
• Spectroscopic Orbits of Eleven Nearby, Mid-to-Late M Dwarf Binaries
• Magnetic dynamos in white dwarfs -- II. Relating magnetism and pollution
• Two new Double-lined Spectroscopic Binary White Dwarfs
• The LHS 1678 System: Two Earth-Sized Transiting Planets and an Astrometric Companion Orbiting an M Dwarf Near the Convective Boundary at 20 pc
• Discovery of kilogauss magnetic fields on the nearby white dwarfs WD1105-340 and WD2150+591
• The nearby magnetic cool DZ white dwarf PM J08186-3110
• The Solar Neighborhood LI: A Variability Survey of Nearby M Dwarfs with Planets from Months to Decades with TESS and the CTIO/SMARTS 0.9 m Telescope
• A network of cooler white dwarfs as infrared standards for flux calibration
• Ground-Based Astrometry 2010-2020
• Detecting water ice and vapor disks originating from icy planetary bodies around white dwarfs with future PRIMA observations