Browsing by Author "Smart, R. L."

Now showing items 1-17 of 17

    • 49 new T dwarfs identified using methane imaging 

      Cardoso, C. V.; Burningham, B.; Smart, R. L.; Spaandonk, L. van; Baker, D.; Smith, L. C.; Andrei, A.H.; Bucciarelli, B.; Dhital, S.; Jones, H.R.A.; Lattanzi, M. G.; Magazzu, A.; Pinfield, D.J.; Tinney, C. G. (2015-07-01)
      We present the discovery of 49 new photometrically classified T dwarfs from the combination of large infrared and optical surveys combined with follow-up TNG photometry. We used multi-band infrared and optical photometry ...

    • Evidence for orbital motion of CW Leonis from ground-based astrometry 

      Sozzetti, A.; Smart, R. L.; Drimmel, R.; Giacobbe, P.; Lattanzi, Mario G. (2017-10)
      Recent Atacama Large Millimeter/submillimeter Array (ALMA) observations indicate that CW Leo, the closest carbon-rich asymptotic giant branch star to Sun, might have a low-mass stellar companion. We present archival ...

    • A focus on L dwarfs with trigonometric parallaxes 

      Wang, Y.; Smart, R. L.; Shao, Z.; Jones, H. R. A; Marocco, F.; Luo, A.; Burgasser, A.; Zhong, J.; Du, B. (2018-05-14)
      We report new parallax measurements for ten L and early T type dwarfs, five of which have no previous published values, using observations over 3 years at the robotic Liverpool Telescope. The resulting parallaxes and proper ...

    • The Gaia Ultra-Cool Dwarf Sample -- II : Structure at the end of the main sequence 

      Smart, R. L.; Marocco, F.; Sarro, L. M.; Barrado, D.; Beamin, J. C.; Caballero, J. A.; Jones, H. R. A. (2019-05-01)
      We identify and investigate known late M, L, and T dwarfs in the Gaia second data release. This sample is being used as a training set in the Gaia data processing chain of the ultracool dwarfs work package. We find 695 ...

    • The Gaia Ultracool Dwarf Sample. I. Known L and T dwarfs and the first Gaia data release 

      Smart, R. L.; Marocco, F.; Caballero, J. A.; Jones, H. R. A.; Barrado, David; Beamin, J.C.; Pinfield, D. J.; Sarro, L. M. (2017-07-01)
      We identify and investigate known ultracool stars and brown dwarfs that are being observed or indirectly constrained by the Gaia mission. These objects will be the core of the Gaia ultracool dwarf sample composed of all ...

    • The kinematic signature of the Galactic warp in Gaia DR1 : I. the H ipparcos subsample 

      Poggio, E.; Drimmel, R.; Smart, R. L.; Spagna, A.; Lattanzi, Mario G. (2017-05-15)
      Context. The mechanism responsible for the warp of our Galaxy, as well as its dynamical nature, continues to remain unknown. With the advent of high precision astrometry, new horizons have been opened for detecting the ...

    • Low-resolution near-infrared spectroscopic signatures of unresolved ultracool companions to M dwarfs 

      Cook, Neil; Pinfield, D. J.; Marocco, F.; Burningham, B.; Jones, H. R. A.; Frith, J.; Zhong, J.; Luo, A. L.; Qi, Z. X.; Cowan, N. B.; Gromadzki, M.; Kurtev, R.G.; Guo, Y. X.; Wang, Y. F.; Song, Y. H.; Yi, Z. P.; Smart, R. L. (2017-06-01)
      We develop a method to identify the spectroscopic signature of unresolved L-dwarf ultracool companions, which compares the spectra of candidates and their associated control stars using spectral ratio differences and ...

    • Parallaxes and Infrared Photometry of three Y0 dwarfs 

      Smart, R. L.; Apai, Dániel; Kirkpatrick, J. Davy; Leggett, S.K.; Marocco, F.; Morrison, Jane E.; Jones, H. R. A.; Pinfield, D.; Tremblin, P.; Amundsen, D. S. (2017-03-24)
      We have followed up the three Y0 dwarfs WISEPA J041022.71+150248.5, WISEPA J173835.53+273258.9 and WISEPC J205628.90+145953.3 using the UKIRT/WFCAM telescope/instruments. We find parallaxes that are more consistent and ...

    • 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 ...

    • 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 ...

    • 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 ...

    • Ultracool dwarf benchmarks with \emph{Gaia} primaries 

      Marocco, F.; Pinfield, D. J.; Cook, N. J.; Osorio, M. R. Zapatero; Montes, D.; Caballero, J. A.; Gálvez-Ortiz, M. C.; Gromadzki, M.; Jones, H. R. A.; Kurtev, R.; Smart, R. L.; Zhang, Z.; Lavers, A. L. Cabrera; Álvarez, D. García; Qi, Z. X.; Rickard, M. J.; Dover, L. (2017-10-01)
      We explore the potential of \emph{Gaia} for the field of benchmark ultracool/brown dwarf companions, and present the results of an initial search for metal-rich/metal-poor systems. A simulated population of resolved ultracool ...

    • Ultracool dwarfs in Gaia DR3 

      Sarro, L. M.; Berihuete, A.; Smart, R. L.; Reylé, C.; Barrado, D.; García-Torres, M.; Cooper, W. J.; Jones, H. R. A.; Marocco, F.; Creevey, O. L.; Sordo, R.; Bailer-Jones, C. A. L.; Montegriffo, P.; Carballo, R.; Andrae, R.; Fouesneau, M.; Lanzafame, A. C.; Pailler, F.; Thévenin, F.; Lobel, A.; Delchambre, L.; Korn, A. J.; Recio-Blanco, A.; Schultheis, M. S.; Angeli, F. De; Brouillet, N.; Casamiquela, L.; Contursi, G.; Laverny, P. de; García-Lario, P.; Kordopatis, G.; Lebreton, Y.; Livanou, E.; Lorca, A.; Palicio, P. A.; Slezak-Oreshina, I.; Soubiran, C.; Ulla, A.; Zhao, H. (2023-01-26)
      Context. Previous Gaia data releases offered the opportunity to uncover ultracool dwarfs (UCDs) through astrometric, rather than purely photometric, selection. The most recent, the third data release (DR3), offers in ...

    • Ultracool Spectroscopic Outliers in Gaia DR3 

      Cooper, W. J.; Smart, R. L.; Jones, H. R. A.; Sarro, L. M. (2024-01-01)
      Gaia DR3 provided a first release of RP spectra and astrophysical parameters for ultracool dwarfs (UCDs). We used these Gaia RP spectra and astrophysical parameters to select the most outlying UCDs. These objects have ...

    • WISEP J061135.13-041024.0 AB: A J-band Flux Reversal Binary at the L/T Transition 

      Gelino, Christopher R.; Smart, R. L.; Marocco, Federico; Kirkpatrick, Davy; Cushing, Michael C.; Mace, Gregory; Mendez, Rene A.; Tinney, C. G.; Jones, Hugh (2014-05-28)
      We present Keck II laser guide star adaptive optics observations of the brown dwarf WISEP J061135.13−041024.0 showing it is a binary with a component separation of 0. 4. This system is one of the six known resolved binaries ...