THE EXEMPLAR T8 SUBDWARF COMPANION OF WOLF 1130

We have discovered a wide separation (188".5) T8 subdwarf companion to the sdM1.5+WD binary Wolf 1130. Companionship of WISE J200520.38+542433.9 is verified through common proper motion over a ~3 yr baseline. Wolf 1130 is located 15.83 + or - 0.96 pc from the Sun, placing the brown dwarf at a p...

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Bibliographic Details
Published in:The Astrophysical journal 2013-11, Vol.777 (1), p.36-12
Main Authors: Mace, Gregory N., Kirkpatrick, J. Davy, Cushing, Michael C., Gelino, Christopher R., McLean, Ian S., Logsdon, Sarah E., Wright, Edward L., Skrutskie, Michael F., Beichman, Charles A., Eisenhardt, Peter R., Kulas, Kristin R.
Format: Article
Language:English
Subjects:
ASTRONOMY
ASTROPHYSICS
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
BENCHMARKS
COLOR
COMPARATIVE EVALUATIONS
DWARF STARS
GRAVITATION
HYDROGEN
INFRARED SPECTRA
IRON
MASS
NEAR INFRARED RADIATION
PROPER MOTION
RESOLUTION
SPACE
SUN
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Summary:We have discovered a wide separation (188".5) T8 subdwarf companion to the sdM1.5+WD binary Wolf 1130. Companionship of WISE J200520.38+542433.9 is verified through common proper motion over a ~3 yr baseline. Wolf 1130 is located 15.83 + or - 0.96 pc from the Sun, placing the brown dwarf at a projected separation of ~3000 AU. Near-infrared colors and medium resolution (R approximately 2000-4000) spectroscopy establish the uniqueness of this system as a high-gravity, low-metallicity benchmark. Although there are a number of low-metallicity T dwarfs in the literature, WISE J200520.38+542433.9 has the most extreme inferred metallicity to date with [Fe/H] = -0.64 + or - 0.17 based on Wolf 1130. Model comparisons to this exemplar late-type subdwarf support it having an old age, a low metallicity, and a small radius. However, the spectroscopic peculiarities of WISE J200520.38+542433.9 underscore the importance of developing the low-metallicity parameter space of the most current atmospheric models.
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/777/1/36