Browsing by Author "Lucas, P.W."

Now showing items 1-20 of 109

    • 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 ...

    • A 2 epoch proper motion catalogue from the UKIDSS Large Area Survey 

      Smith, Leigh; Lucas, P.W.; Burningham, B.; Jones, H.R.A.; Pinfield, D.J.; Smart, Ricky; Andrei, Alexandre (EDP Sciences, 2013)
      The UKIDSS Large Area Survey (LAS) began in 2005, with the start of the UKIDSS program as a 7 year effort to survey roughly 4000 square degrees at high galactic latitudes in Y, J, H and K bands. The survey also included a ...

    • 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 ...

    • An abundance of small exoplanets around stars with a wide range of metallicities 

      Buchhave, Lars A.; Latham, David W.; Johansen, Anders; Bizzarro, Martin; Torres, Guillermo; Rowe, Jason F.; Batalha, Natalie M.; Borucki, William J.; Brugamyer, Erik; Caldwell, Caroline; Bryson, Stephen T.; Ciardi, David R.; Cochran, William D.; Endl, Michael; Esquerdo, Gilbert A.; Ford, Eric B.; Geary, John C.; Gilliland, Ronald L.; Hansen, Terese; Isaacson, Howard; Laird, John B.; Lucas, P.W.; Marcy, Geoffrey W.; Morse, Jon A.; Robertson, Paul; Shporer, Avi; Stefanik, Robert P.; Still, Martin; Quinn, Samuel N. (2012-06-21)
      The abundance of heavy elements (metallicity) in the photospheres of stars similar to the Sun provides a 'fossil' record of the chemical composition of the initial protoplanetary disk. Metal-rich stars are much more likely ...

    • Adaptive optics observations of the T10 ultracool dwarf UGPS J072227.51-054031.2 

      Bouy, H.; Girard, J.H.V.; Martin, E.L.; Huelamo, N.; Lucas, P.W. (2011)
      Context: With a spectral type of T10, UGPS J072227.51-054031.2 is one of the coolest objects known to date in the solar neighborhood. Aims: Multiple systems are relatively common among early and mid-T dwarfs. We search for ...

    • Alignment of atmospheric mineral dust due to electric field 

      Ulanowski, Z.; Bailey, J. A.; Lucas, P.W.; Hough, J.; Hirst, E. (2007)
      Optical polarimetry observations on La Palma, Canary Islands, during a Saharan dust episode show dichroic extinction indicating the presence of vertically aligned particles in the atmosphere. Modelling of the extinction ...

    • Blue not brown: UKIRT Infrared Deep Sky Survey T dwarfs with suppressed K-band flux 

      Murray, D. N.; Burningham, B.; Jones, H.R.A.; Pinfield, D.J.; Lucas, P.W.; Leggett, S. K.; Tinney, C. G.; Day-Jones, A. C.; Weights, D. J.; Lodieu, N.; Perez Prieto, J. A.; Nickson, E.; Zhang, Z. H.; Clarke, J. R. A.; Jenkins, J. S.; Tamura, M. (2011-06)
      We have used blue near-infrared colours to select a group of 12 spectroscopically confirmed United Kingdom InfraRed Telescope (UKIRT) Infrared Deep Sky Survey (UKIDSS) T dwarfs later than T4. From amongst these, we identify ...

    • The brightest pure-H ultracool white dwarf 

      Catalan, S.; Tremblay, P. -E.; Pinfield, D.J.; Smith, Leigh; Zhang, Z. H.; Napiwotzki, R.; Marocco, F.; Day-Jones, A. C.; Gomes, J.; Forde, K.P.; Lucas, P.W.; Jones, H.R.A. (2012-10)
      We report the identification of LSR J0745+2627 in the United Kingdom InfraRed Telescope Infrared Deep Sky Survey (UKIDSS) Large Area Survey (LAS) as a cool white dwarf with kinematics and age compatible with the thick-disk/halo ...

    • Butterfly star in Taurus: Structures of young stellar objects 

      Lucas, P.W.; Roche, P.F. (1997-04-21)
      We present high-resolution, near-infrared images of a sample of five low-mass young stellar objects in the Taurus-Auriga dark cloud, mostly observed with the 'shift and add' technique, together with deep polarimetric images. ...

    • A census of molecular hydrogen outflows and their sources along the Orion A molecular ridge: Characteristics and overall distribution 

      Davis, C.J.; Froebrich, D.; Stanke, T.; Megeath, S.T.; Kumar, M.S.N.; Adamson, A.J.; Eisloffel, J.; Gredel, R.; Khanzadyan, T.; Lucas, P.W.; Smith, M.D.; Varricatt, W.P. (2009)

    • Characteristics of planetary candidates observed by Kepler II : Analysis of the first four months of data 

      Borucki, W.J.; Koch, D.G.; Basri, G.; Batalha, N.; Brown, T.M.; Bryson, S.T.; Caldwell, T.; Christensen-Dalsgaard, J.; Cochran, W.D.; DeVore, E.; Dunham, E.W.; Gautier, T.N.; Geary, J.C.; Gilliland, R.; Gould, A.; Howell, S.B.; Jenkins, J.M.; Latham, D.W.; Lissauer, J.J.; Marcy, G.W.; Rowe, J.; Sasselov, D.; Boss, A.; Charbonneau, D.; Ciardi, D.; Doyle, L.; Dupree, A.K.; Ford, E.B.; Fortney, J.; Holman, M.J.; Seager, S.; Steffen, J.H.; Tarter, J.; Welsh, W.F.; Allen, C.; Buchhave, L.A.; Christiansen, J.L.; Clarke, B.D.; Das, S.; Desert, J.M.; Endl, M.; Fabrycky, D.; Fressin, F.; Haas, M.; Horch, E.; Howard, A.; Isaacson, H.; Kjeldsen, H.; Kolodziejczak, J.; Kulesa, C.; Li, J.; Lucas, P.W.; Machalek, P.; McCarthy, D.; MacQueen, P.; Meibom, S.; Miquel, T.; Prsa, A.; Quinn, S.N.; Quintana, E.V.; Ragozzine, D.; Sherry, W.; Shpora, A.; Tenenbaum, P.; Torres, G.; Twicken, J.D.; Van Cleve, J.; Walkowicz, L.; Witteborn, F.C.; Still, M. (2011)
      On 2011 February 1 the Kepler mission released data for 156,453 stars observed from the beginning of the science observations on 2009 May 2 through September 16. There are 1235 planetary candidates with transit-like ...

    • Circular polarimetry reveals helical magnetic fields in the young stellar object HH 135 136 

      Chrysostomou, A.; Lucas, P.W.; Hough, J. (2007)

    • Circular polarisation in star-forming regions : possible implications for homochirality 

      Hough, J.; Bailey, J.; Chrysostomou, A.; Gledhill, T.; Lucas, P.W.; Tamura, M.; Clark, S.; Yates, J.A.; Menard, F. (2001)

    • A circumstellar disk associated with a massive protostellar object 

      Jiang, Z.; Tamura, M.; Fukagawa, M.; Hough, J.; Lucas, P.W.; Suto, H.; Ishii, M.; Yang, J. (2005)

    • A deep survey of Brown Dwarfs in Orion with Gemini 

      Lucas, P.W.; Roche, P.F.; Tamura, M. (2005)

    • A deep WISE search for very late type objects and the discovery of two halo/thick-disc T dwarfs : WISE 0013+0634 and WISE 0833+0052 

      Pinfield, D.J.; Gomes, J.; Day-Jones, A. C.; Leggett, S.K.; Gromadzki, M.; Burningham, B.; Ruiz, M. T.; Kurtev, R.; Cattermole, T.; Cardoso, C.; Lodieu, N.; Faherty, J.; Littlefair, S.; Smart, R.; Irwin, M.; Clarke, J. R. A.; Smith, Leigh; Lucas, P.W.; Galvez-Ortiz, M. C.; Jenkins, J. S.; Jones, H.R.A.; Rebolo, R.; Bejar, V. J. S.; Gauza, B. (2014-01-11)
      A method is defined for identifying late-T and Y dwarfs in WISE down to low values of signal-to-noise. This requires a WISE detection only in the W2-band and uses the statistical properties of the WISE multiframe measurements ...

    • Discovery and atmospheric characterization of giant planet Kepler-12b : An inflated radius outlier 

      Fortney, J.J.; Nutzman, P.; Miller, N.; Demory, B.-O.; Seager, S.; Désert, J.-M.; Buchhave, L.A.; Charbonneau, D.; Fressin, F.; Latham, D.W.; Geary, J.C.; Rowe, J.; Caldwell, D.A.; Jenkins, J.M.; Christiansen, J.L.; Marcy, G.W.; Isaacson, H.; Howard, A.; Knutson, H.A.; Buchhave, L.A.; Ciardi, D.; Gautier, T.N.; Batalha, N.M.; Bryson, S.T.; Howell, S.B.; Borucki, W.J.; Koch, D.; Lissauer, J.J.; Haas, M.R.; Everett, M.; Deming, D.; Brown, T.M.; Ford, E.B.; Gilliland, R.L.; Fischer, D.A.; Still, M.; Lucas, P.W.; Gillon, M. (2011-11-01)
      We report the discovery of planet Kepler-12b (KOI-20), which at 1.695 ± 0.030 R is among the handful of planets with super-inflated radii above 1.65 R. Orbiting its slightly evolved G0 host with a 4.438 day period, this ...

    • Discovery of a brown dwarf companion to the A3V star β Circini 

      Smith, Leigh; Lucas, P.W.; Peña, C. Contreras; Kurtev, R.; Marocco, Federico; Jones, H.R.A.; Beamin, J.C.; Napiwotzki, Ralf; Borissova, J.; Burningham, B.; Faherty, J.; Pinfield, D.J.; Gromadzki, M.; Ivanov, V.D.; Minniti, D.; Stimson, W.; Villanueva, V. (2015-12-21)
      We report the discovery of an L dwarf companion to the A3V star β Circini. VVV J151721.49−585131.5, or β Cir B, was identified in a proper motion and parallax catalogue of the VISTA Variables in the Vía Láctea survey as ...

    • 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 ...