Browsing by Author "Burningham, B."

Now showing items 41-60 of 62

    • 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 ...

    • On the nature of Collinder 121: insights from the low-mass pre-main sequence 

      Burningham, B.; Naylor, T.; Jeffries, R.D.; Devey, C.R. (2003)

    • 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 southern extremely cool objects III : 118 L and T dwarfs 

      Smart, R. L.; Bucciarelli, B.; Jones, H. R. A.; Marocco, F.; Andrei, A. H.; Goldman, B.; Mendez, R. A.; d'Avila, V. A.; Burningham, B.; Camargo, J. I. B.; Crosta, M. T.; Daprà, M.; Jenkins, J. S.; Lachaume, R.; Lattanzi, M. G.; Penna, J. L.; Pinfield, D. J.; Neto, D. N. da Silva; Sozzetti, A.; Vecchiato, A. (2018-12-11)
      We present new results from the Parallaxes of Southern Extremely Cool dwarfs program to measure parallaxes, proper motions and multiepoch photometry of L and early T dwarfs. The observations were made on 108 nights over ...

    • The physical properties of four ~600 K T dwarfs 

      Leggett, S.K.; Cushing, M.C.; Saumon, D.; Marley, M.; Roellig, T.L.; Warren, S.J.; Burningham, B.; Jones, H.R.A.; Kirkpatrick, J.D.; Lodieu, N.; Lucas, P.W.; Mainzer, A.K.; Martin, E.L.; McCaughrean, M.J.; Pinfield, D.J.; Sloan, G.C.; Smart, R.L.; Tamura, M.; Van Cleve, J. (2009)
      We present Spitzer 7.6-14.5 μm spectra of ULAS J003402.77–005206.7 and ULAS J133553.45+113005.2, two T9 dwarfs with the latest spectral types currently known. We fit synthetic spectra and photometry to the near- through ...

    • Primeval very low-mass stars and brown dwarfs - III. The halo transitional brown dwarfs 

      Zhang, Z. H.; Pinfield, D. J.; Galvez-Ortiz, M. C.; Homeier, D.; Burgasser, A. J.; Lodieu, N.; Martin, E. L.; Osorio, M. R. Zapatero; Allard, F.; Jones, H. R. A.; Smart, R. L.; Marti, B. Lopez; Burningham, B.; Rebolo, R. (2018-09-01)
      We report the discovery of an esdL3 subdwarf, ULAS J020858.62+020657.0 and a usdL4.5 subdwarf, ULAS J230711.01+014447.1. They were identified as L subdwarfs by optical spectra obtained with the Gran Telescopio Canarias, ...

    • Primeval very low-mass stars and brown dwarfs - IV. New L subdwarfs, Gaia astrometry, population properties, and a blue brown dwarf binary 

      Zhang, Z. H.; Galvez-Ortiz, M. C.; Pinfield, D. J.; Burgasser, A. J.; Lodieu, N.; Jones, H. R. A.; Martin, E. L.; Burningham, B.; Homeier, D.; Allard, F.; Osorio, M. R. Zapatero; Smith, L. C.; Smart, R. L.; Marti, B. Lopez; Marocco, F.; Rebolo, R. (2018-11-11)
      We present 27 new L subdwarfs and classify five of them as esdL and 22 as sdL. Our L subdwarf candidates were selected with the UKIRT Infrared Deep Sky Survey and Sloan Digital Sky Survey. Spectroscopic follow-up was carried ...

    • Primeval very low-mass stars and brown dwarfs. I. Six new L subdwarfs, classification and atmospheric properties 

      Zhang, Z. H.; Pinfield, D. J.; Galvez-Ortiz, M. C.; Burningham, B.; Lodieu, N.; Marocco, F.; Burgasser, A. J.; Day-Jones, A. C.; Allard, F.; Jones, H. R. A.; Homeier, D.; Gomes, J.; Smart, R. L. (2017-01-01)
      We have conducted a search for L subdwarf candidates within the photometric catalogues of the UKIRT Infrared Deep Sky Survey and Sloan Digital Sky Survey. Six of our candidates are confirmed as L subdwarfs spectroscopically ...

    • The Properties of the 500 K Dwarf UGPS J072227.51-054031.2, and a Study of the Far-Red Flux of Cold Brown Dwarfs 

      Leggett, S.; Saumon, D.; Marley, M.; Lodders, K.; Canty, J.; Lucas, P.W.; Smart, R.; Tinney, C.; Homeier, D.; Allard, F.; Burningham, B.; Day-Jones, A.; Fegley, B.; Ishii, Miki; Jones, H.R.A.; Marocco, F.; Pinfield, D.J.; Tamura, M. (2012-04-01)
      We present i and z photometry for 25 T dwarfs and one L dwarf. Combined with published photometry, the data show that the i - z, z - Y and z - J colors of T dwarfs are very red, and continue to increase through to the ...

    • Properties of the T8.5 dwarf Wolf 940 B 

      Leggett, S.K.; Saumon, D.; Burningham, B.; Cushing, M.C.; Marley, M.; Pinfield, D.J. (2010)
      We present 7.5-14.2 μm low-resolution spectroscopy, obtained with the Spitzer Infrared Spectrograph, of the T8.5 dwarf Wolf 940 B, which is a companion to an M4 dwarf with a projected separation of 400 AU. We combine these ...

    • The properties of the T8.5p dwarf Ross 458C 

      Burningham, B.; Leggett, S.K.; Homeier, D.; Saumon, D.; Lucas, P.W.; Pinfield, D.J.; Tinney, C. G.; Allard, F.; Marley, M. S.; Jones, H.R.A.; Murray, D. N.; Ishii, M.; Day-Jones, A.; Gomes, J.; Zhang, Z. H. (2011-07)
      We present near-infrared photometry and spectroscopy, and warm-Spitzer IRAC photometry of the young very cool T dwarf Ross 458C, which we have typed as T8.5p. By applying the fiducial age constraints (<= 1 Gyr) imposed by ...

    • Purple dwarfs : New L subdwarfs from UKIDSS and SDSS 

      Zhang, Z. H.; Pinfield, D.J.; Burningham, B.; Jones, H.R.A.; Day-Jones, A. C.; Marocco, F.; Gomes, J.; Galvez-Ortiz, M. C. (EDP Sciences, 2013)
      The first L subdwarf was a discovered only ten years ago. Less than ten L subdwarfs been published in the literature to date. Metal-poor ultracool atmospheres has not been well understood. Halo mass function cross substellar ...

    • 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 ...

    • A search for southern ultracool dwarfs in young moving groups 

      Clarke, J.R.A.; Pinfield, D.J.; Galvez-Ortiz, M.C.; Jenkins, J.S.; Burningham, B.; Deacon, Niall; Jones, H.R.A.; Pokorny, R.S.; Barnes, J.R.; Day-Jones, A.C. (2010)
      We associate 132 low-mass ultracool dwarfs in the southern hemisphere as candidate members of five moving groups (MGs) using photometric and astrometric selection techniques. Of these objects, we present high-resolution ...

    • Serendipitous discovery of a dusty disc around WDJ181417.84-735459.83 

      Egea, E. González; Koester, D.; Rogers, L. K.; Marocco, F.; Cooper, W. J.; Beamin, J. C.; Burningham, B.; Day-Jones, A.; Forbrich, J.; Pinfield, D. J. (2020-12-12)
      Spectroscopic observations of white dwarfs reveal that many of them are polluted by exoplanetary material, whose bulk composition can be uniquely probed this way. We present a spectroscopic and photometric analysis of the ...

    • A spectroscopic and proper motion search of Sloan Digital Sky Survey : red subdwarfs in binary systems 

      Zhang, Z. H.; Pinfield, D.J.; Burningham, B.; Jones, H.R.A.; Galvez-Ortiz, M. C.; Catalan, S.; Smart, R. L.; Lepine, S.; Clarke, J. R. A.; Pavlenko, Ya V.; Murray, D. N.; Kuznetsov, M. K.; Day-Jones, A. C.; Gomes, J.; Marocco, F.; Sipocz, B. (2013-09)
      Red subdwarfs in binary systems are crucial for both model calibration and spectral classification. We search for red subdwarfs in binary systems from a sample of high proper motion objects with Sloan Digital Sky Survey ...

    • Spectroscopy and kinematics of low-mass members of young moving groups 

      Galvez-Ortiz, M. C.; Clarke, J.R.A.; Pinfield, D.J.; Jenkins, J. S.; Folkes, S. L.; Garcia Perez, A. E.; Day-Jones, A.C.; Burningham, B.; Jones, H.R.A.; Barnes, J. R.; Pokorny, R.S. (2010)
      We study a target sample of 68 low-mass objects (with spectral types in the range M4.5–L1) previously selected via photometric and astrometric criteria, as possible members of five young moving groups: the Local Association ...

    • The sub-stellar birth rate from UKIDSS 

      Day-Jones, A. C.; Marocco, F.; Pinfield, D.J.; Zhang, Z. H.; Burningham, B.; Deacon, Niall; Ruiz, M. T.; Gallardo, J.; Jones, H.R.A.; Lucas, P.W.; Jenkins, J. S.; Gomes, J.; Folkes, S. L.; Clarke, J. R. A. (2013-04)
      We present a new sample of mid-L to mid-T dwarfs with effective temperatures of 11001700 K selected from the UKIDSS Large Area Survey (LAS) and confirmed with infrared spectra from X-shooter/Very Large Telescope. This ...

    • The substellar companion in the eclipsing white dwarf binary SDSS J141126.20+200911.1 

      Littlefair, S.P.; Casewell, S.L.; Parsons, S.G.; Dhillon, V. S.; Marsh, T.R.; Gansicke, B.T.; Bloemen, S.; Catalan, Silvia; Irawati, P.; Hardy, L.K.; Mcallister, M.; Bours, M.C.P.; Richichi, A.; Burleigh, M.R.; Burningham, B.; Breedt, E.; Kerry, P. (2014-12-01)
      We present high time resolution SDSS-g′ and SDSS-z′ light curves of the primary eclipse in SDSS J141126.20+200911.1, together with time-resolved X-Shooter spectroscopy and near-infrared (NIR) JHKs photometry. Our observations ...