A very cool brown dwarf in UKIDSS DR1
S. J. Warren, D. J. Mortlock, S. K. Leggett, D. J. Pinfield, D., Homeier, S. Dye, R. F. Jameson, N. Lodieu, P. W. Lucas, A. J. Adamson, F., Allard, D. Barrado y Navascues, M. Casali, K. Chiu, N. C. Hambly, P. C., Hewett, P. Hirst, M. J. Irwin, A. Lawrence, M. C. Liu

TL;DR
This paper reports the discovery and detailed characterization of a new, cooler brown dwarf, ULAS J0034-00, using multi-wavelength photometry and spectroscopy, revealing it to be potentially the coolest T dwarf known.
Contribution
It provides the first detailed analysis of ULAS J0034-00, establishing it as a significantly cooler brown dwarf than previously known T8 objects, with implications for brown dwarf temperature and spectral classification.
Findings
ULAS J0034-00 is classified as T8.5.
Estimated temperature range is 600-700 K.
Mass and age are estimated at 15-36 M(Jup) and 0.5-8 Gyr.
Abstract
(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<Teff<660 K (+/-2sig range). Third, the J- and H-band peaks are somewhat narrower in ULAS J0034-00, and detailed comparison against spectral models calibrated to 2MASS J0415-09 yields an estimated temperature lower…
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