Eight new T4.5-T7.5 dwarfs discovered in the UKIDSS large area survey data release 1
Lodieu, N.; Pinfield, D.J.; Leggett, S.K.; et al.Jameson, R.F.; Mortlock, D.J.; Warren, S.J.; Burningham, B.; Lucas, P.W.; Chiu, K.; Liu, M.C.; Venemans, B.P.; McMahon, R.G.; Allard, F.; Baraffe, I.; Navascue, D.B.Y.; Carraro, G.; Casewell, S.L.; Chabrier, G.; Chappelle, R.J.; Clarke, F.; Day-Jones, A.C.; Deacon, N.R.; Dobbie, P.D.; Folkes, S.L.; Hambly, N.C.; Hewett, P.C.; Hodgkin, S.T.; Jones, H.R.A.; Kendall, T.R.; Magazzu, A.; Martin, E.L.; McCaughrean, M.J.; Nakajima, T.; Pavlenko, Y.; Tamura, M.; Tinney, C.G.; Osorio, M.R.Z.
Monthly Notices of the Royal Astronomical Society
Oxford University Press for Royal Astronomical Society
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 ...
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 deg(2) (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.
Physics and Astronomy
College of Engineering, Mathematics and Physical Sciences
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