Spectral Classification and Effective Temperatures of L and T Dwarfs   Based of Near-Infrared Spectra
  We have obtained near-infrared spectra of L dwarfs, L/T transition objects and T dwarfs using Subaru. Resulting spectra are examined in detail to see their dependence on the spectral types. We have obtained bolometric luminosities of the objects with known parallaxes in our sample, first by integrating the spectra and second by K band bolometric correction. We derive the relation between effective temperature and spectral type. 
Tadashi Nakajima, Takashi Tsuji and Kenshi Yanagisawa