The Exemplar T8 Subdwarf Companion of Wolf 1130
Gregory N. Mace (UCLA, IPAC), J. Davy Kirkpatrick (IPAC), Michael C., Cushing (U. of Toledo), Christopher R. Gelino (IPAC), Ian S. McLean (UCLA),, Sarah E. Logsdon (UCLA), Edward L. Wright (UCLA), Michael F. Skrutskie (U. of, Virginia), Charles A. Beichman (IPAC)

TL;DR
This paper reports the discovery of a wide-separation T8 subdwarf companion to Wolf 1130, providing a unique benchmark for studying low-metallicity, high-gravity brown dwarfs with implications for atmospheric models.
Contribution
The discovery of WISE J200520.38+542433.9 as the most extreme low-metallicity T dwarf companion to Wolf 1130, offering new insights into subdwarf properties and atmospheric modeling.
Findings
Most extreme inferred metallicity for a T dwarf to date ([Fe/H] = -0.64)
Supports the subdwarf's old age, low metallicity, and small radius
Highlights the need to improve low-metallicity atmospheric models
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…
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