Browsing by Author "Barnes, J. R."

Now showing items 1-5 of 5

    • 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 ...
    • Precision radial velocities of 15 M5–M9 dwarfs 
      Barnes, J. R.; Jenkins, James Stewart; Jones, H.R.A.; Jeffers, S. V.; Rojo Rubke, Patricio; Arriagada, P.; Jordán, A.; Minniti, D.; Tuomi, M.; Pinfield, D. J.; Anglada Escudé, Guillem (Royal Astronomical Society, 2014-02-20)
      We present radial velocity measurements of a sample of M5V–M9V stars from our Red-Optical Planet Survey, operating at 0.652–1.025 µm. Radial velocities for 15 stars, with rms precision down to 2.5 m s−1 over a week-long ...
    • A search for southern ultracool dwarfs in young moving groups 
      Clarke, J. R. A.; Pinfield, D. J.; Gálvez Ortiz, M. C.; Jenkins, James Stewart; Burningham, B.; Deacon, N. R.; Jones, Hugh; 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 ...
    • 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 ...