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Proper motions of field L and T dwarfs -II
S. L. Casewell, R. F. Jameson, M. R. Burleigh
By using images taken with WFCAM on UKIRT and SofI on the NTT and combining them with 2MASS we have measured proper motions for 126 L and T dwarfs in the dwarf archive. Two of thes…
L dwarfs in the Hyades
E. Hogan, R. F. Jameson, S. L. Casewell +2
We present the results of a proper motion survey of the Hyades to search for brown dwarfs, based on UKIDSS and 2MASS data. This survey covers ~275 square degrees to depth of K~15 m…
The ages of L dwarfs
R. F. Jameson, N. Lodieu, S. L. Casewell +2
We present a new method to derive the age of young (<0.7 Gyr) L dwarfs based on their near-infrared photometry, colours, and distances. The method is based on samples of L dwarfs b…
Near-infrared cross-dispersed spectroscopy of brown dwarf candidates in the Upper Sco association
N. Lodieu, N. C. Hambly, R. F. Jameson +1
We present near-infrared (1.15-2.50 microns) medium-resolution (R = 1700) spectroscopy of a sample of 23 brown dwarf candidates in the young Upper Sco association. We confirm membe…
Proper motions of field L and T dwarfs
R. F. Jameson, S. L. Casewell, N. P. Bannister +4
The proper motion measurements for 143 previously known L and T dwarfs are presented. From this sample we identify and discuss 8 high velocity L dwarfs. We also find 4 new wide com…
A very cool brown dwarf in UKIDSS DR1
S. J. Warren, D. J. Mortlock, S. K. Leggett +21
(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-infrar…