Infrared Observations and Modeling of one of the Coolest T Dwarfs, Gl 570D

Details Infrared Observations and Modeling of one of the Coolest T Dwarfs, Gl 570D Infrared Observations and Modeling of one of the Coolest T Dwarfs, Gl 570D

2001-03-13

arxiv.org/abs/astro-ph/0103187v1

Astrophys.J.556:373-379,2001

Astronomy and Astrophysics

Astrophysics

22 pages (Latex) and 4 figures (postscript); accepted for publication by ApJ (main journal)

Scientific paper

10.1086/321575

We have obtained a good quality R$\sim$400 0.8-2.5 $\mu$m spectrum and accurate photometry of Gl 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 $\mu$m, 1.33-1.45 $\mu$m, 1.62-1.88 $\mu$m, and 2.20-2.45 $\mu$m and is both bluer at J-K and redder at $K-L^{\prime}$ 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 log gravity in the range 5.00-5.27 cm s$^{-2}$, and a luminosity in the range 2.88-2.98 $\times$ 10$^{-6}$ L$_\odot$.

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