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We present the discovery of the first L-type subdwarf, 2MASSJ05325346+8246465. This object exhibits enhanced collision-induced H$_2$absorption, resulting in blue NIR colors ($J-K_s = 0.26{\pm}0.16$). Inaddition, strong hydride bands in the red optical and NIR, weak TiO absorption,and an optical/J-band spectral morphology similar to the L7 DENIS 0205$-$1159ABimply a cool, metal-deficient atmosphere. We find that 2MASS 0532+8246 has botha high proper motion, $\mu$ = 2$\farcs60\pm0\farcs$15 yr$^{-1}$, and asubstantial radial velocity, $v_{rad} = -195{\pm}11$ km s$^{-1}$, and itsprobable proximity to the Sun (d = 10--30 pc) is consistent with halomembership. Comparison to subsolar-metallicity evolutionary models stronglysuggests that 2MASS 0532+8246 is substellar, with a mass of 0.077 $\lesssim$ M$\lesssim$ 0.085 M$_{\sun}$ for ages 10--15 Gyr and metallicities $Z =0.1-0.01$ $Z_{\sun}$. The discovery of this object clearly indicates that starformation occurred below the Hydrogen burning mass limit at early times,consistent with prior results indicating a flat or slightly rising massfunction for the lowest-mass stellar subdwarfs. Furthermore, 2MASS 0532+8246serves as a prototype for a new spectral class of subdwarfs, additionalexamples of which could be found in NIR proper motion surveys.Comment: 9 pages, 3 figures, accepted to Ap

The First Substellar Subdwarf? Discovery of a Metal‐poor L Dwarf with Halo Kinematics