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25 April 2024

» arxiv » 1309.1500

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The Exemplar T8 Subdwarf Companion of Wolf 1130
Gregory N. Mace ; J. Davy Kirkpatrick ; Michael C. Cushing ; Christopher R. Gelino ; Ian S. McLean ; Sarah E. Logsdon ; Edward L. Wright ; Michael F. Skrutskie ; Charles A. Beichman ; Peter R. Eisenhardt ; Kristin R. Kulas ;
Date:	5 Sep 2013
Abstract:	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 year baseline. Wolf 1130 is located 15.83 +/- 0.96 parsecs from the Sun, placing the brown dwarf at a projected separation of ~3000 AU. Near-infrared colors and medium resolution (R~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 +/- 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.
Source:	arXiv, 1309.1500
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