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Eight new T4.5–T7.5 dwarfs discovered in the UKIDSS Large Area Survey Data Release 1


Lodieu, N and Pinfield, DJ and Legget, SK and Jameson, RF and Mortlock, DJ and Warren, SJ and Burningham, B and Lucas, PW and Chiu, K and Liu, MC and Venemans, BP and McMahon, RG and Allard, F and Baraffe, I and Barrado y Navacues, D and Carraro, G and Casewell, SL and Chabrier, G and Chappelle, RJ and Clarke, F and Day-Jones, AC and Deacon, NR and Dobbie, PD and Folkes, SL and Hambly, NC and Hewett, PC and Hodgkin, ST and Jones, HRA and Kendall, TR and Magazzu, A and Martin, EL and McCaughrean, MJ and Nakajima, T and Pavlenko, Y and Tamura, M and Tinney, CG and Zapatero Osorio, MR, Eight new T4.5-T7.5 dwarfs discovered in the UKIDSS Large Area Survey Data Release 1, Monthly Notices of the Royal Astronomical Society, 379, (4) pp. 1423-1430. ISSN 0035-8711 (2007) [Refereed Article]

Copyright Statement

Copyright 2007 The Authors. Journal compilation copyright 2007 RAS

DOI: doi:10.1111/j.1365-2966.2007.12023.x


We present eight new T4.5–T7.5 dwarfs identified in the UKIRT (United Kingdom Infrared Telescope) Infrared Deep Sky Survey (UKIDSS) Large Area Survey (LAS) Data Release 1 (DR1). In addition we have recovered the T4.5 dwarf SDSS J020742.91+000056.2 and the T8.5 dwarf ULAS J003402.77−005206.7. Photometric candidates were picked up in two-colour diagrams over 190 deg2 (DR1) and selected in at least two filters. All candidates exhibit near-infrared spectra with strong methane and water absorption bands characteristic of T dwarfs and the derived spectral types follow the unified scheme of Burgasser et al.. We have found six new T4.5–T5.5 dwarfs, one T7 dwarf, one T7.5 dwarf and recovered a T4.5 dwarf and a T8.5 dwarf. We provide distance estimates which lie in the 15–85 pc range; the T7.5 and T8.5 dwarfs are probably within 25 pc of the Sun. We conclude with a discussion of the number of T dwarfs expected after completion of the LAS, comparing these initial results to theoretical simulations.

Item Details

Item Type:Refereed Article
Keywords:techniques: photometric; techniques: spectroscopic; surveys; stars: low-mass, brown dwarfs; infrared: stars
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Stellar astronomy and planetary systems
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Dobbie, PD (Dr Paul Dobbie)
ID Code:81083
Year Published:2007
Web of Science® Times Cited:69
Deposited By:Mathematics and Physics
Deposited On:2012-11-22
Last Modified:2013-06-26

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