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We have discovered a wide separation (188.5") T8 subdwarf companion to thesdM1.5+WD binary Wolf 1130. Companionship of WISE J200520.38+542433.9 isverified through common proper motion over a ~3 year baseline. Wolf 1130 islocated 15.83 +/- 0.96 parsecs from the Sun, placing the brown dwarf at aprojected separation of ~3000 AU. Near-infrared colors and medium resolution(R~2000-4000) spectroscopy establish the uniqueness of this system as ahigh-gravity, low-metallicity benchmark. Although there are a number oflow-metallicity T dwarfs in the literature, WISE J200520.38+542433.9 has themost extreme inferred metallicity to date with [Fe/H] = -0.64 +/- 0.17 based onWolf 1130. Model comparisons to this exemplar late-type subdwarf support ithaving an old age, a low metallicity, and a small radius. However, thespectroscopic peculiarities of WISE J200520.38+542433.9 underscore theimportance of developing the low-metallicity parameter space of the mostcurrent atmospheric models.

The Exemplar T8 Subdwarf Companion of Wolf 1130