Infrared observations and modeling of one of the coolest T dwarfs: Gliese 570D

T. R. Geballe, D. Saumon, S. K. Leggett, G. R. Knapp, M. S. Marley, K. Lodders

Research output: Contribution to journalArticlepeer-review

91 Scopus citations


We have obtained a good-quality R ∼ 400, 0.8-2.5 μm spectrum as well as accurate photometry of Gliese 570D, one of the coolest and least-luminous brown dwarfs currently known. The spectrum shows that Gl 570D has deeper absorptions in the strong water and methane bands at 1.12-1.17, 1.33-1.45, 1.62-1.88, and 2.20-2.45 μm and is both bluer at J - K and redder at K - L′ than previously observed T dwarfs. Data analysis using model spectra coupled with knowledge of the well-understood primary implies that for the same surface gravity, Gl 570D is about 160 K cooler than Gl 229B. For an age range of 2-5 Gyr, Gl 570D has an effective temperature in the range 784-824 K, a surface gravity log g in the range 5.00-5.27 (cm s-2), and a luminosity in the range (2.88-2.98) × 10-6 L.

Original languageEnglish (US)
Pages (from-to)373-379
Number of pages7
JournalAstrophysical Journal
Issue number1 PART 1
StatePublished - Jul 20 2001
Externally publishedYes


  • Stars: abundances
  • Stars: atmospheres
  • Stars: individual (Gliese 570D)
  • Stars: low-mass, brown dwarfs

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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