  We present a new Y dwarf, WISE J030449.03-270508.3, confirmed from a
candidate sample designed to pick out low temperature objects from the WISE
database. The new object is typed Y0pec following a visual comparison with
spectral standards, and lies at a likely distance of 10-17 pc. Its tangential
velocity suggests thin disk membership, but it shows some spectral
characteristics that suggest it may be metal-poor and/or older than previously
identified Y0 dwarfs. Based on trends seen for warmer late type T dwarfs, the
Y-band flux peak morphology is indicative of sub-solar metallicity, and the
enhanced red wing of the J-band flux peak offers evidence for high gravity
and/or low metallicity (with associated model trends suggesting an age closer
to ~10 Gyr and mass in the range 0.02-0.03 Mo). This object may thus be
extending the population parameter-space of the known Y0 dwarfs.
