Atmospheric, Evolutionary, and Spectral Models of the Brown Dwarf Gliese   229 B
  Theoretical spectra and evolutionary models that span the giant planet--brown dwarf continuum have been computed based on the recent discovery of the brown dwarf, Gliese 229 B. A flux enhancement in the 4--5 micron window is a universal feature from Jovian planets to brown dwarfs. We confirm the existence of methane and water in Gl 229 B's spectrum and find its mass to be 30 to 55 Jovian masses. Although these calculations focus on Gliese 229 B, they are also meant to guide future searches for extra-solar giant planets and brown dwarfs. 
M.S. Marley, D. Saumon, T. Guillot, R. S. Freedman, W.B. Hubbard, A.   Burrows, and J.I. Lunine