The onset of methane in l dwarfs

Keith S. Noll, T. R. Geballe, S. K. Leggett, Mark S. Marley

Research output: Contribution to journalArticlepeer-review


We have detected weak absorption features produced by the strong n3 methane band at 3.3 mm in two L dwarfs, 2MASSW J15074762162738 and 2MASSI J0825196±211552, classified as spectral types L5 and L7.5, respectively. These absorptions occur in objects warmer than any in which methane previously has been detected and mark the first appearance of methane in the ultracool star-to-brown dwarf spectral sequence.

Original languageEnglish (US)
Pages (from-to)L5-L8
JournalAstrophysical Journal Letters
Issue number2
StatePublished - Oct 1 2000
Externally publishedYes


  • Brown dwarfs
  • Infrared
  • Low-mass
  • Stars-radiative transfer-stars

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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