H- and K- Band Methane Features in an L Dwarf, 2MASS 0920+35

Tadashi Nakajima, Takashi Tsuji, Kenshi Yanagisawa
2003 Symposium - International astronomical union  
We have obtained near-infrared spectra of three L dwarfs discovered by 2MASS, 1146+22 (L3), 1507-16 (L5), and 0920+35 (L6.5). From the comparison of the H and K band spectra of these L dwarfs, we have found the presence of methane absorption in 0920+35. This implies that detectable methane absorption in the H and K bands, usually considered the signature of a T dwarf, can be present in objects classified optically as late L. Methane detection in L dwarfs is consistent with the presence of a
more » ... e presence of a dust layer deep in the atmosphere as the unified model of Tsuji suggests. (This work has been published in Nakajima, Tsuji & Yanagisawa (2001).)
doi:10.1017/s0074180900211066 fatcat:m67xcwxqsfcovnt3tj6n7dwgxq