Browsing by Author "Jones, H. R. A."

Now showing items 1-9 of 9

    • 76 T dwarfs from the UKIDSS LAS: benchmarks, kinematics and an updated space density 
      Burningham, Ben; Cardoso, C. V.; Smith, L.; 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, N.; Marley, M. S.; Spaandonk, L. van; 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.; Magazzú, A.; Marocco, F.; Murray, D. N.; Rojas-Ayala, B.; Tamura, M. (Oxford University Press on behalf of the Royal Astronomical Society, 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 ...
    • Analysis of combined radial velocities and activity of BD+20 1790: evidence supporting the existence of a ... 
      Hernán Obispo, M.; Tuomi, M.; Gálvez Ortiz, M. C.; Golovin, A.; Barnes, J. R.; Jones, H. R. A.; Kane, S. R.; Pinfield, D.; Jenkins, James Stewart; Petit, P.; Anglada Escudé, Guillem; Marsden, S. C.; Catalán, S.; Jeffers, S. V.; Castro, E. de; Cornide, M.; Garcés, A.; Jones, M. I.; Gorlova, N.; Andreev, M. (EDP Sciences, 2015)
      Context. In a previous paper we reported a planetary companion to the young and very active K5Ve star BD+20 1790. We found that this star has a high level of stellar activity (log R HK = −3.7) that manifests in a plethora ...
    • Benchmark cool companions: ages and abundances for the PZ Telescopii system 
      Jenkins, James Stewart; Pavlenko, Y. V.; Ivanyuk, O.; Gallardo, J.; Jones, M. I.; Day-Jones, A. C.; Jones, H. R. A.; Ruiz González, María Teresa; Pinfield, D. J.; Yakovina, L. (WILEY-BLACKWELL, 2012-03)
      We present new ages and abundance measurements for the pre-main-sequence star PZ Telescopii (more commonly known as PZ Tel). PZ Tel was recently found to host a young and low-mass companion. Such companions, whether they ...
    • A deep WISE search for very late type objects and the discovery of two halo/thick-disc T dwarfs: WISE ... 
      Pinfield, D. J.; Gomes, J.; Day Jones, A. C.; Leggett, S. K.; Gromadzki, M.; Burningham, B.; Ruiz González, María Teresa; Kurtev, R.; Cattermole, T.; Cardoso, C.; Lodieu, N.; Faherty, J.; Littlefair, S.; Smart, R.; Irwin, M.; Clarke, J. R. A.; Smith, L.; Lucas, P. W.; Gálvez Ortiz, M. C.; Jenkins, James Stewart; Jones, H. R. A.; Rebolo, L.; Béjar, V. J. S.; Gauza, B. (Oxford University Press, 2014)
      A method is defined for identifying late-T and Y dwarfs in WISE down to low values of signalto- noise. This requires a WISE detection only in theW2-band and uses the statistical properties of the WISE multiframe measurements ...
    • The observed distribution of spectroscopic binaries from the Anglo-Australian Planet Search 
      Jenkins, James Stewart; Díaz, M.; Jones, H. R. A.; Butler, R. P.; Tinney, C. G.; O’Toole, S. J.; Carter, B. D.; Wittenmyer, R. A.; Pinfield, D. J. (Oxford University Press, 2015)
      We report the detection of sixteen binary systems from the Anglo-Australian Planet Search. Solutions to the radial velocity data indicate that the stars have companions orbiting with a wide range of masses, eccentricities ...
    • Signals embedded in the radial velocity noise Periodic variations in the τ Ceti velocities 
      Tuomi, M.; Jones, H. R. A.; Jenkins, James Stewart; Tinney, C. G.; Butler, R. P.; Vogt, S. S.; Barnes, J. R.; Wittenmyer, R. A.; O’Toole, S.; Horner, J.; Bailey, J.; Carter, B. D.; Wright, D. J.; Salter, G. S.; Pinfield, D. (EDP Sciences, 2013)
      Context. The abilities of radial velocity exoplanet surveys to detect the lowest-mass extra-solar planets are currently limited by a combination of instrument precision, lack of data, and “jitter”. Jitter is a general ...
    • Spectroscopic signatures of youth in low-mass kinematic candidates of young moving groups 
      Gálvez Ortiz, M. C.; Kuznetsov, M.; Clarke, J. R. A.; Pavlenko, Ya. V.; Folkes, S. L.; Pinfield, D. J.; Jones, H. R. A.; Jenkins, James Stewart; Barnes, J. R.; Burningham, B.; Day Jones, A. C.; Martín, E. L.; García Pérez, A. E.; Burgo, C. del; Pokorny, R. S. (Oxford University Press, 2014)
      We present a study of age-related spectral signatures observed in 25 young low-mass objects that we have previously determined as possible kinematic members of five young moving groups: the Local Association (Pleiades ...
    • The sub-stellar birth rate from UKIDSS 
      Day Jones, A. C.; Marocco, F.; Pinfield, D. J.; Zhang, Z. H.; Burningham, B.; Deacon, N.; Ruiz González, María Teresa; Gallardo, J.; Jones, H. R. A.; Lucas, P. W.; Jenkins, James Stewart; Gomes, J.; Folkes, S. L.; Clarke, J. R. A. (Oxford University Press on behalf of the Royal Astronomical Society, 2013)
      We present a new sample of mid-L to mid-T dwarfs with effective temperatures of 1100– 1700 K selected from the UKIDSS Large Area Survey (LAS) and confirmed with infrared spectra from X-shooter/Very Large Telescope . This ...
    • Two new ultracool benchmark systems from WISE+2MASS 
      Gomes, J. I.; Pinfield, D. J.; Marocco, F.; Day Jones, A. C.; Burningham, B.; Zhang, Z. H.; Jones, H. R. A.; Spaandonk, L. van; Weights, D. (Oxford University Press, 2013)
      We have used the Two-Micron All-Sky Survey and the Wide-field Infrared Survey Explorer to look for ultracool dwarfs that are part of multiple systems containing main-sequence stars.We cross-matched L dwarf candidates ...