Spitzer Infrared Spectrograph (IRS) observations of M, L, and T dwarfs

T. L. Roellig, J. E. Van Cleve, G. C. Sloan, J. C. Wilson, D. Saumon, S. K. Leggett, M. S. Marley, M. C. Cushing, J. D. Kirkpatrick, A. K. Mainzer, J. R. Houck

Research output: Contribution to journalArticlepeer-review

53 Scopus citations


We present the first mid-infrared spectra of brown dwarfs, together with observations of a low-mass star. Our targets are the M3.5 dwarf GJ 1001A, the L8 dwarf DENIS-P J0255-4700, and the T1/T6 binary system ∈ Indi Ba/Bb. As expected, the mid-infrared spectral morphology of these objects changes rapidly with spectral class because of the changes in atmospheric chemistry resulting from their differing effective temperatures and atmospheric structures. By taking advantage of the unprecedented sensitivity of the Infrared Spectrograph on the Spitzer Space Telescope, we have detected the 7.8 μm methane and 10 μm ammonia bands for the first time in brown dwarf spectra.

Original languageEnglish (US)
Pages (from-to)418-421
Number of pages4
JournalAstrophysical Journal, Supplement Series
Issue number1
StatePublished - Sep 2004
Externally publishedYes


  • Infrared: stars
  • Stars: low-mass, brown dwarfs

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


Dive into the research topics of 'Spitzer Infrared Spectrograph (IRS) observations of M, L, and T dwarfs'. Together they form a unique fingerprint.

Cite this