A very cool brown dwarf in UKIDSS DR1

Details A very cool brown dwarf in UKIDSS DR1 A very cool brown dwarf in UKIDSS DR1

2007-08-05

arxiv.org/abs/0708.0655v1

Mon.Not.Roy.Astron.Soc.381:1400-1412,2007

Astronomy and Astrophysics

Astrophysics

To appear in MNRAS

Scientific paper

10.1111/j.1365-2966.2007.12348.x

(abridged) We report the discovery of a very cool brown dwarf, ULAS J003402.77-005206.7 (ULAS J0034-00), identified in UKIDSS DR1. We provide optical, near-infrared, and mid-infrared photometry of the source, and two near-infrared spectra. Comparing the spectral energy distribution of ULAS J0034-00 to that of the T8 brown dwarf 2MASS J0415-09, the latest-type and coolest well-studied brown dwarf to date, with Teff~750 K, we find evidence that ULAS J0034-00 is significantly cooler. First, the measured values of the near-infrared absorption spectral indices imply a later classification, of T8.5. Second, the H-[4.49] colour provides an empirical estimate of the temperature of 540

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