Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 395, Issue 3, Pages 1631-1639Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2009.14650.x
Keywords
techniques: photometric; surveys; stars: low-mass, brown dwarfs; infrared: stars
Categories
Funding
- NOVA
- NWO-VIDI [639.041.405]
- National Research Council of Canada
- Canadian Space Agency
- STFC [PP/E00105X/1, ST/F001967/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/F001967/1, PP/E00105X/1] Funding Source: researchfish
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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 deg(2) in DXS for their blue J - K 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; 2 sigma confidence level). A similar search in the DR2 of the Ultra-Deep Survey over a smaller area (0.77 deg(2)) 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.
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