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.
- Brown dwarfs
- Stars-radiative transfer-stars
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science