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

62 Scopus citations


We have detected weak absorption features produced by the strong ν3 methane band at 3.3 μm in two L dwarfs, 2MASSW J1507476-162738 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)L75-L78
JournalAstrophysical Journal
Issue number2 PART 2
StatePublished - Oct 1 2000
Externally publishedYes


  • Brown dwarfs
  • Infrared: stars
  • Radiative transfer
  • Stars: low-mass

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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