Browsing by Author "Littlefair, S. P."

Now showing items 1-3 of 3

    • 76 T dwarfs from the UKIDSS LAS : benchmarks, kinematics and an updated space density 

      Burningham, B.; Cardoso, C. V.; Smith, Leigh; Leggett, S.K.; Smart, R.L.; Mann, A. W.; Dhital, S.; Lucas, P.W.; Tinney, C.G.; Pinfield, D.J.; Zhang, Z.; Morley, C.; Saumon, D.; Aller, K.; Littlefair, S. P.; Homeier, D.; Lodieu, N.; Deacon, Niall; Marley, M. S.; van Spaandonk, L.; Baker, D.; Allard, F.; Andrei, A.H.; Canty, J.; Clarke, J.; Day-Jones, A. C.; Dupuy, T.; Fortney, J. J.; Gomes, J.; Ishii, M.; Jones, H.R.A.; Liu, M.; Magazzu, A.; Marocco, F.; Murray, D. N.; Rojas-Ayala, B.; Tamura, M. (2013-07)
      We report the discovery of 76 new T dwarfs from the UKIRT Infrared Deep Sky Survey (UKIDSS) Large Area Survey (LAS). Near-infrared broad- and narrow-band photometry and spectroscopy are presented for the new objects, along ...

    • Probing gamma-ray burst environments with time variability: ULTRASPEC fast imaging of GRB 080210 

      De Cia, A.; Jakobsson, P.; Bjornsson, G.; Vreeswijk, P. M.; Dhillon, V. S.; Marsh, T. R.; Chapman, R.; Fynbo, J. P. U.; Ledoux, C.; Littlefair, S. P.; Malesani, D.; Schulze, S.; Smette, A.; Zafar, T.; Gudmundsson, E. H. (2011-04)
      We present high time resolution (1.09 s) photometry of GRB 080210 obtained with ULTRASPEC mounted on the ESO/3.6-m telescope, starting 68.22 min after the burst and lasting for 26.45 min. The light curve is smooth on both ...

    • Robust detection of quasi-periodic variability : A HAWKI mini survey of late T dwarfs 

      Littlefair, S. P.; Burningham, B.; Helling, Ch (2017-05-01)
      We present HAWK-I J-band light curves of five late-type T dwarfs (T6.5-T7.5) with a typical duration of four hours, and investigate the evidence for quasi-periodic photometric variability on intra-night timescales. Our ...