Discovery of New Ultracool White Dwarfs in the Sloan Digital Sky Survey

@article{Gates2004DiscoveryON,
  title={Discovery of New Ultracool White Dwarfs in the Sloan Digital Sky Survey},
  author={Evalyn I. Gates and Geza Gyuk and Hugh C. Harris and Mark SubbaRao and Scott Anderson and Scott J. Kleinman and James William Liebert and Howard J. Brewington and Jonathan Brinkmann and Michael Harvanek and Jurek Krzesinski and Donald Q. Lamb and Daniel C. Long and Eric H. Neilsen Jr. and P. R. Newman and Atsuko Nitta and Stephanie A. Snedden},
  journal={The Astrophysical Journal Letters},
  year={2004},
  volume={612},
  pages={L129 - L132}
}
We report the discovery of five new white dwarfs in the Sloan Digital Sky Survey. Four are ultracool, exhibiting strong collision-induced absorption (CIA) from molecular hydrogen and are similar in color to the three previously known coolest white dwarfs, SDSS J1337+00, LHS 3250, and LHS 1402. The fifth star shows milder CIA flux suppression and has a color and spectral shape similar to WD 0346+246. All five new white dwarfs are faint (g > 18.9) and have significant proper motions. One of the… 
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References

SHOWING 1-10 OF 34 REFERENCES
A New Very Cool White Dwarf Discovered by the Sloan Digital Sky Survey
Early data taken during commissioning of the Sloan Digital Sky Survey (SDSS) have resulted in the discovery of a very cool white dwarf. It appears to have stronger collision-induced absorption from…
Observations of Ultracool White Dwarfs
  • 2001
DISCOVERY OF AN ULTRACOOL WHITE DWARF COMPANION
The discovery of a low-luminosity common proper-motion companion to the white dwarf GD 392 at a wide separation of 46'' is reported. BVRI photometry suggests a low temperature (Teff ~ 4000 K), while…
White Dwarfs in the Calán-ESO Survey
A sample of 33 white dwarfs (31 of them previously unknown) was recently discovered as a result of a proper-motion survey using red plates, which covered 350 deg2 in the sky. In this paper we present…
Discovery of High Proper-Motion Ancient White Dwarfs: Nearby Massive Compact Halo Objects?
TLDR
It appears that a significant fraction of the local dark matter halo is in the form of very old, cool, white dwarf stars, found in a systematic proper-motion survey.
Infrared spectrum of an extremely cool white-dwarf star
TLDR
An infrared spectrum of an extremely cool white dwarf that is consistent with the new models is reported, determining the star's temperature to be 3,500 ± 200 K, making it the coolest known white dwarf.
A Catalog of Spectroscopically Identified White Dwarf Stars in the First Data Release of the Sloan Digital Sky Survey
We present the full spectroscopic white dwarf and hot subdwarf sample from the Sloan Digital Sky Survey (SDSS) first data release, DR1. We find 2551 white dwarf stars of various types, 240 hot…
A Very Low Luminosity, Very Cool, DC White Dwarf*
The star LHS 3250 is found to be a white dwarf at a distance of 30 pc. Its absolute magnitudes (MV = 15.72, Mbol = 16.2) put it among the least luminous white dwarfs known. Its optical spectrum shows…
On the parallax of WD 0346++246: a halo white dwarf candidate
We present a parallax measurement for the very cool degenerate WD 0346+246, the serendipitous discovery of which was reported by Hambly et al. We find an absolute parallax of 36±5 mas, yielding a…
WD 0346+246: A Very Low Luminosity, Cool Degenerate in Taurus
We report the serendipitous discovery of a new, very low luminosity, cool degenerate in the region of Taurus. The object was found as a very high proper-motion star (μ = 1.″3 yr-1) on seven I-band UK…
...
...