Browsing by Author "Smart, R.L."

Now showing items 1-20 of 22

    • A 1500 deg(2) near infrared proper motion catalogue from the UKIDSS Large Area Survey 

      Smith, Leigh; Lucas, P.W.; Burningham, B.; Jones, H.R.A.; Smart, R.L.; Andrei, A.H.; Catalan, S.; Pinfield, D.J. (2014-02)
      The United Kingdom Infrared Deep Sky Survey (UKIDSS) Large Area Survey (LAS) began in 2005, with the start of the UKIDSS programme as a 7 year effort to survey roughly 4000 deg(2) at high Galactic latitudes in Y, J, H and ...

    • 47 new T dwarfs from the UKIDDS large area survey 

      Burningham, B.; Pinfield, D.J.; Lucas, P.W.; Leggett, S.K.; Deacon, Niall; Tamura, M.; Tinney, C.G.; Lodieu, N.; Zhang, Z.; Huelamo, N.; Jones, H.R.A.; Murray, D.N.; Mortlock, D.J.; Patel, M.; Barrado y Navascues, D.; Zapatero Osorio, M.R.; Ishii, M.; Kuzuhara, M.; Smart, R.L. (2010)
      We report the discovery of 47 new T dwarfs in the Fourth Data Release (DR4) from the Large Area Survey (LAS) of the United Kingdom Infrared Telescope (UKIRT) Infrared Deep Sky Survey with spectral types ranging from T0 to ...

    • 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 ...

    • Cool dwarfs stars from the Torino Observatory Parallax Program 

      Smart, R.L.; Ioannidis, G.; Jones, H.R.A.; Bucciarelli, B.; Lattanzi, M.G. (2010)
      Aims. We investigate and parameterize high proper motion red stars in the Torino Observatory Parallax Program. Methods. Observations of 27 objects were made over the period 1994–2001 on the 1.05 m Torino telescope. The ...

    • Discovery of a new Y dwarf: WISE J030449.03-270508.3 

      Pinfield, D.J.; Gromadzki, M.; Leggett, S.K.; Gomes, J.; Lodieu, N.; Kurtev, R.; Day-Jones, A. C.; Ruiz, M. T.; Cook, N. J.; Morley, C.V.; Marley, M. S.; Marocco, F.; Smart, R.L.; Jones, H.R.A.; Lucas, P.W.; Beletsky, Y.; Ivanov, V. D.; Burningham, B.; Jenkins, J. S.; Cardoso, C.; Frith, J.; Clarke, J. R. A.; Gálvez-Ortiz, M. C.; Zhang, Z. (2014-10-21)
      We present a new Y dwarf, WISE J030449.03−270508.3, confirmed from a candidate sample designed to pick out low-temperature objects from the Wide-field Infrared Survey Explorer (WISE) data base. The new object is typed Y0pec ...

    • Discovery of a peculiar DQ white dwarf 

      Carollo, D.; Hodgkin, S.T.; Spagna, A.; Smart, R.L.; Lattanzi, M.G.; McLean, B.J.; Pinfield, D.J. (2002)

    • The discovery of a T6.5 subdwarf 

      Burningham, B.; Smith, Leigh; Cardoso, C. V.; Lucas, P.W.; Burgasser, A. J.; Jones, H.R.A.; Smart, R.L. (2014-05)
      We report the discovery of ULAS J131610.28+075553.0, an sdT6.5 dwarf in the UKIDSS Large Area Survey 2 epoch proper motion catalogue. This object displays significant spectral peculiarity, with the largest yet seen deviations ...

    • The discovery of a very cool binary system 

      Burningham, B.; Leggett, S.K.; Lucas, P.W.; Pinfield, D.J.; Smart, R.L.; Day-Jones, A.C.; Jones, H.R.A.; Murray, D.N.; Nickson, E.; Tamura, M.; Zhang, Z.; Lodieu, N.; Tinney, C.G.; Zapatero Osorio, M.R. (2010)
      We report the discovery of a very cool d/sdL7+T7.5p common proper motion binary system, SDSS J1416+13AB, found by cross-matching the United Kingdom Infrared Telescope (UKIRT) Infrared Deep Sky Survey (UKIDSS) Large Area ...

    • The distance to the cool T9 brown dwarf ULAS J003402.77-005206.7 

      Smart, R.L.; Jones, H.R.A.; Lattanzi, M.G.; Leggett, S.K.; Warren, S.J.; Adamson, A.J.; Burningham, B.; Casali, M.; Evans, D.W.; Irwin, M.J.; Pinfield, D.J. (2010)
      Aims. We demonstrate the feasibility of determining parallaxes for nearby objects with the Wide Field Camera on the United Kingdom Infrared Telescope (UKIRT) using the UKIRT Infrared Deep Sky Survey as a first epoch. We ...

    • The extremely red L dwarf ULAS J222711-004547-dominated by dust 

      Marocco, F.; Day-Jones, A. C.; Lucas, P.W.; Jones, H.R.A.; Smart, R.L.; Zhang, Z. H.; Gomes, J. I.; Burningham, B.; Pinfield, D.J.; Raddi, R.; Smith, Leigh (2014-03)
      We report the discovery of a peculiar L dwarf from the United Kingdom Infrared Deep Sky Survey Large Area Survey, ULAS J222711-004547. The very red infrared photometry (MKO J-K = 2.79 +/- 0.06, WISEW1-W2 = 0.65 +/- 0.05) ...

    • High proper motion objects from the UKIDSS Galactic plane survey 

      Smith, Leigh; Lucas, P.W.; Bunce, R.; Burningham, B.; Jones, H.R.A.; Smart, R.L.; Skrzypek, N.; Rodriguez, D. R.; Faherty, J.; Barentsen, G.; Drew, J.E.; Andrei, A.H.; Catalán, S.; Pinfield, D.J.; Redburn, D. (2014-09-21)
      The UKIDSS Galactic Plane Survey (GPS) began in 2005 as a seven year effort to survey ~1800 deg2 of the northern Galactic plane in the J, H, and K passbands. The survey included a second epoch of K-band data, with a baseline ...

    • A large spectroscopic sample of L and T dwarfs from UKIDSS LAS : peculiar objects, binaries, and space density 

      Marocco, F.; Jones, H.R.A.; Day-Jones, A. C.; Pinfield, D.J.; Lucas, P.W.; Burningham, B.; Zhang, Z. H.; Smart, R.L.; Gomes, J. I.; Smith, L. (2015-06-01)
      We present the spectroscopic analysis of a large sample of late-M, L, and T dwarfs from UKIDSS. Using the YJHK photometry from ULAS and the red-optical photometry from SDSS we selected a sample of 262 brown dwarf candidates ...

    • Methane and ammonia in the near-infrared spectra of late-T dwarfs 

      Canty, J. I.; Lucas, P.W.; Yurchenko, S.N.; Tennyson, Jonathan; Leggett, S.K.; Tinney, C.G.; Jones, H.R.A.; Burningham, B.; Pinfield, D.J.; Smart, R.L. (2015-06-11)
      Analysis of T dwarfs using model atmospheres has been hampered by the absence of reliable line lists for methane and ammonia. Newly computed high-temperature line lists for both of these important molecules are now available, ...

    • Mid-infrared photometry of cold brown dwarfs : diversity in age, mass and metallicity 

      Leggett, S.K.; Burningham, B.; Saumon, D.; Marley, M.; Warren, S.J.; Smart, R.L.; Jones, H.R.A.; Lucas, P.W.; Pinfield, D.J.; Tamura, M. (2010)
      We present new Spitzer Infrared Array Camera (IRAC) photometry of 12 very late-type T dwarfs: nine have [3.6], [4.5], [5.8], and [8.0] photometry and three have [3.6] and [4.5] photometry only. Combining this with previously ...

    • NPARSEC : NTT Parallaxes of Southern Extremely Cool objects. Goals, targets, procedures and first results 

      Smart, R.L.; Tinney, C.G.; Bucciarelli, B.; Marocco, F.; Abbas, U.; Andrei, A.; Bernardi, G.; Burningham, B.; Cardoso, C.; Costa, E.; Crosta, M.T.; Dapra, M.; Day-Jones, A.; Goldman, B.; Jones, H.R.A.; Lattanzi, M.G.; Leggett, S.K.; Lucas, P.W.; Mendez, R.; Penna, J.L.; Pinfield, D.J.; Smith, Leigh; Sozzetti, A.; Vecchiato, A. (2013-08)
      The discovery and subsequent detailed study of T dwarfs have provided many surprises and pushed the physics and modelling of cool atmospheres in unpredicted directions. Distance is a critical parameter for studies of these ...

    • Parallaxes and physical properties of 11 mid-to-late T dwarfs 

      Marocco, F.; Smart, R.L.; Jones, H.R.A.; Burningham, B.; Lattanzi, M.G.; Leggett, S.K.; Lucas, P.W.; Tinney, C.G.; Adamson, A.; Evans, D. W.; Lodieu, N.; Murray, D.N.; Pinfield, D.J.; Tamura, M. (2010)
      Aims. We present parallaxes of 11 mid-to-late T dwarfs observed in the UKIRT Infrared Deep Sky Survey. We use these results to test the reliability of model predictions in magnitude–color space, determine a magnitude-spectral ...

    • Parallaxes of Five L Dwarfs with a Robotic Telescope 

      Wang, Y.; Jones, H.R.A.; Smart, R.L.; Marocco, F.; Pinfield, D.J.; Shao, Z.; Steele, I.A.; Zhang, Z.; Andrei, A.H.; Burgasser, A. J.; Cruz, K. L.; Yu, J.; Clarke, J. R. A.; Leigh, C.J.; Sozzetti, A.; Murray, D. N.; Burningham, B. (2014-01-01)
      We report the parallax and proper motion of five L dwarfs obtained with observations from the robotic Liverpool Telescope. Our derived proper motions are consistent with published values and have considerably smaller errors. ...

    • Parallaxes of L and T dwarfs 

      Smart, R.L.; Bailer-Jones, C.A.L.; Jones, H.R.A. (2004)

    • Parallaxes of southern extremely cool objects (PARSEC). II : Spectroscopic follow-up and parallaxes of 52 targets 

      Marocco, F.; Andrei, A.H.; Smart, R.L.; Jones, H.R.A.; Pinfield, D.J.; Day-Jones, A. C.; Clarke, J. R. A.; Sozzetti, A.; Lucas, P.W.; Bucciarelli, B.; Penna, J.L. (2013-12)
      We present near-infrared spectroscopy for 52 ultracool dwarfs, including two newly discovered late-M dwarfs, one new late-M subdwarf candidate, three new L, and four new T dwarfs. We also present parallaxes and proper ...

    • Parallaxes of southern extremely cool objects. I. : Targets, proper motions, and first results 

      Andrei, A.H.; Smart, R.L.; Penna, J.L.; d'Avila, V.A.; Bucciarelli, B.; Camargo, J.I.B.; Crosta, M.T.; Dapra, M.; Goldman, B.; Jones, H.R.A.; Lattanzi, M.G.; Nicastro, L.; Pinfield, D.J.; da Silva Neto, D. N.; Teixeira, R. (2011)
      We present results from the PARallaxes of Southern Extremely Cool objects ( PARSEC) program, an observational program begun in 2007 April to determine parallaxes for 122 L and 28 T southern hemisphere dwarfs using the Wide ...