The 2MASS Wide-Field T Dwarf Search. III. Seven New T Dwarfs and Other Cool Dwarf Discoveries

We present the discovery of seven new T dwarfs identified in the Two Micron All Sky Survey. Low-resolution (R ∼ 150) 0.8–2.5 μm spectroscopy obtained with the Infrared Telescope Facility (IRTF) SpeX instrument reveals the characteristic H2O and CH4 bands in the spectra of these brown dwarfs. Comparison with spectral standards observed with the same instrument enables us to derive classifications of T3 to T7 for the objects in this sample....