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We present {\lambda}/{\Delta}{\lambda} ~ 6000 near-infrared spectroscopy ofthe nearby T9 dwarf, UGPS J072227.51-054031.2, obtained during thecommissioning of the Folded-Port Infrared Echellette Spectrograph on the BaadeMagellan telescope at Las Campanas Observatory. The spectrum is marked bysignificant absorption from H2O, CH4 and H2. We also identify NH3 absorptionfeatures by comparing the spectrum to recently published line lists. Thespectrum is fit with BT-Settl models, indicating Teff ~ 500-600 K and log g ~4.3-5.0. This corresponds to a mass of ~ 10-30 MJup and an age of 1-5 Gyr,however there are large discrepancies between the model and observed spectrum.The radial and rotational velocities of the brown dwarf are measured as 46.9\pm 2.5 and 40 \pm 10 km/s, respectively, reflecting a thin disk Galactic orbitand fast rotation similar to other T dwarfs, suggesting a young, possiblyplanetary-mass brown dwarf.

FIRE Spectroscopy of the ultra-cool brown dwarf, UGPS J072227.51-054031.2: Kinematics, Rotation and Atmospheric Parameters