The Solar Neighborhood. XXI. Parallax Results from the CTIOPI 0.9m Program: 20 New Members of the 25 Parsec White Dwarf Sample

Abstract

We present accurate trigonometric parallaxes for 20 new members of the 25 pc white dwarf sample as part of the DENSE project (Discovery and Evalution of Nearby Stellar Embers, http://www.DenseProject.com). Previously, there were a total of 112 white dwarf systems with trigonometric parallaxes placing them within 25 pc and of these, 99 have trigonometric parallaxes known to better than 10%. Thus, the 20 new members presented in this work represent a 20% increase in the number of white dwarfs accurately known to be within 25 pc. In addition, we present updated parallaxes for seven known white dwarfs within 10 pc that have been observed as part of the ASPENS initiative (Astrometric Search for Planets Encircling Nearby Stars) to monitor nearby southern red and white dwarfs for astrometric perturbations from unseen companions. Including a few white dwarf companions and white dwarfs beyond 25 pc, we present a total of 33 trigonometric parallaxes. We perform atmospheric modeling for white dwarfs to determine physical parameters (i.e., effective temperature, log g, mass, and white dwarf age). Finally, a new ZZ Ceti pulsating white dwarf was identified and revised constraints are placed on two mixed H/He atmosphere cool white dwarfs that display continuum absorption in the near-infrared.

13 pages, 8 figures, to be published in The Astronomical Journal

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Cited by in corpus (16)

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• CARMENES input catalogue of M dwarfs II. High-resolution imaging with FastCam
• Measurements of Physical Parameters of White Dwarfs: A Test of the Mass-Radius Relation
• LACEwING: A New Moving Group Analysis Code
• Near-infrared photometry of Y dwarfs: low ammonia abundance and the onset of water clouds
• The Gaia DR1 Mass-Radius Relation for White Dwarfs
• The Solar Neighborhood. XXXIX. Parallax Results from the CTIOPI and NOFS Programs: 50 New Members of the 25 Parsec White Dwarf Sample
• The Solar Neighborhood. XXXIV. A Search for Planets Orbiting Nearby M Dwarfs using Astrometry
• A 3D Search for Companions to 12 Nearby M-Dwarfs
• Precision asteroseismology of the pulsating white dwarf GD 1212 using a two-wheel-controlled Kepler spacecraft
• Distance Dependent Offsets between Parallaxes for Nearby Stars and Gaia DR1 Parallaxes
• Multi-band photometry and spectroscopy of an all-sky sample of bright white dwarfs
• A New Parallax Measurement for the Coldest Known Brown Dwarf
• Probing the structure of Kepler ZZ Ceti stars with full evolutionary models-based asteroseismology
• Near-infrared Detection of WD 0806-661 B with the Hubble Space Telescope