The Onset of Methane in L Dwarfs

Details The Onset of Methane in L Dwarfs The Onset of Methane in L Dwarfs

2000-07-28

arxiv.org/abs/astro-ph/0007449v1

Astronomy and Astrophysics

Astrophysics

12 pages, 2 figures; accepted by ApJ Letters

Scientific paper

10.1086/312906

We have detected weak absorption features produced by the strong nu(3) methane band at 3.3 microns in two L dwarfs, 2MASSW J1507476-162738 and 2MASSI J0825196+211552, classified by Kirkpatrick et al. (2000) 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.

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