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Two distant brown dwarfs in the UKIRT Infrared Deep Sky Survey Deep Extragalactic Survey Data Release 2

Citation

Lodieu, N and Dobbie, PD and Deacon, NR and Venemans, BP and Durant, M, Two distant brown dwarfs in the UKIRT Infrared Deep Sky Survey Deep Extragalactic Survey Data Release 2, Monthly Notices of the Royal Astronomical Society, 395, (3) pp. 1631-1639. ISSN 0035-8711 (2009) [Refereed Article]

Copyright Statement

Copyright 2009 The Authors. Journal compilation copyright 2009 RAS.

DOI: doi:10.1111/j.1365-2966.2009.14650.x

Abstract

We present the discovery of two brown dwarfs in the UK infrared Telescope (UKIRT) Infrared Deep Sky Survey (UKIDSS) Deep Extragalactic Survey (DXS) Data Release 2 (DR2). Both objects were selected photometrically from 6 deg2 in DXS for their blue JK colour and the lack of optical counterparts in the Sloan Digital Sky Survey (SDSS) Stripe 82. Additional optical photometry provided by the Canada–France–Hawaii Telescope Legacy Survey (CFHTLS) corroborated the possible substellarity of these candidates. Subsequent methane imaging of UDXS J221611.51+003308.1 and UDXS J221903.10+002418.2 has confirmed them as T7 ± 1 and T6 ± 1 dwarfs at photometric distances of 81 (52–118 pc) and 60 (44–87 pc; 2σ confidence level). A similar search in the DR2 of the Ultra-Deep Survey over a smaller area (0.77 deg2) and shallower depth did not return any late-T dwarf candidate. The numbers of late-T dwarfs in our study are broadly in line with a declining mass function when considering the current area and depth of the DXS and UDS. These brown dwarfs are the first discovered in the Visible Imaging Multi-Object Spectrograph (VIMOS) 4 field and among the few T dwarfs found in pencil-beam surveys. They are valuable to investigate the scaleheight of T dwarfs.

Item Details

Item Type:Refereed Article
Keywords:techniques: photometric; surveys; stars: low-mass, brown dwarfs; infrared: stars
Research Division:Physical Sciences
Research Group:Astronomical and Space Sciences
Research Field:Stellar Astronomy and Planetary Systems
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Physical Sciences
Author:Dobbie, PD (Dr Paul Dobbie)
ID Code:81029
Year Published:2009
Web of Science® Times Cited:8
Deposited By:Mathematics and Physics
Deposited On:2012-11-21
Last Modified:2013-06-26
Downloads:0

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