학술논문
A very cool brown dwarf in UKIDSS DR1
Document Type
Working Paper
Author
Warren, S. J.; Mortlock, D. J.; Leggett, S. K.; Pinfield, D. J.; Homeier, D.; Dye, S.; Jameson, R. F.; Lodieu, N.; Lucas, P. W.; Adamson, A. J.; Allard, F.; Navascues, D. Barrado y; Casali, M.; Chiu, K.; Hambly, N. C.; Hewett, P. C.; Hirst, P.; Irwin, M. J.; Lawrence, A.; Liu, M. C.; Martin, E. L.; Smart, R. L.; Valdivielso, L.; Venemans, B. P.
Source
Mon.Not.Roy.Astron.Soc.381:1400-1412,2007
Subject
Language
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