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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 

References

Geballe, T. et al. 1996, ApJ, 467,L101 Google Scholar
Geballe, T. et al. 2002, ApJ, 564,466 Google Scholar
Marley, M. et al. 2002, ApJ, 568,335 CrossRefGoogle Scholar
Nakajima, T., Tsuji, T. & Yanagisawa, K. 2001, ApJ, 561, L119 Google Scholar
Noll, K. S. et al. 2000, ApJ, 548,908 Google Scholar
Tsuji, T. 2002, ApJ, 575, 264 Google Scholar