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

Published online by Cambridge University Press:  26 May 2016

Tadashi Nakajima ,
Takashi Tsuji  and
Kenshi Yanagisawa
Tadashi Nakajima
Affiliation:
National Astronomical Observatory, 2–21–1 Osawa, Mitaka, Tokyo, 181–8588, Japan
Takashi Tsuji
Affiliation:
Institute of Astronomy, University of Tokyo, 2–21–1 Osawa, Mitaka, Tokyo, 181–0015, Japan
Kenshi Yanagisawa
Affiliation:
Okayama Astrophysical Observatory, Kamogata, Okayama, 719–0232, Japan

Abstract

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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 dust layer deep in the atmosphere as the unified model of Tsuji suggests. (This work has been published in Nakajima, Tsuji & Yanagisawa (2001).)

Type
Part 7. Atmospheres and Internal Structure
Information
Symposium - International Astronomical Union , Volume 211: Brown Dwarfs , 2003 , pp. 423 - 424
Copyright
Copyright © Astronomical Society of the Pacific 2001 

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