Parallaxes of Five L Dwarfs with a Robotic Telescope

Y. Wang, H.R.A. Jones, R.L. Smart, F. Marocco, D.J. Pinfield, Z. Shao, I.A. Steele, Z. Zhang, A.H. Andrei, A. J. Burgasser, K. L. Cruz, J. Yu, J. R. A. Clarke, C.J. Leigh, A. Sozzetti, D. N. Murray, B. Burningham

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Abstract

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. Based on our spectral type versus absolute magnitude diagram, we do not find any evidence for binaries among our sampleor, at least no comparable mass binaries. Their space velocities locate them within the thin disk, and based on the model comparisons, they have solar-like abundances. For all five objects, we derived effective temperature, luminosity, radius, gravity, and mass from an evolutionary model (CBA00) and our measured parallax; moreover, we derived their effective temperature by integrating observed optical and near-infrared spectra and model spectra (BSH06 or BT-Dusty) at longer wavelengths to obtain bolometric flux using the classical Stefan-Boltzmann law. Generally, the three temperatures for one object derived using two different methods with three models are consistent, although at lower temperature (e.g., for L4) the differences among the three temperatures are slightly larger than those at higher temperature (e.g., for L1).

Original languageEnglish
Pages (from-to)15-26
Number of pages12
JournalPublications of the Astronomical Society of the Pacific
Volume126
Issue number935
DOIs
Publication statusPublished - 1 Jan 2014

Keywords

  • Stars
  • DIGITAL SKY SURVEY
  • EXTRASOLAR GIANT PLANETS
  • LOW-MASS STARS
  • BROWN DWARFS
  • T-DWARFS
  • PROPER MOTIONS
  • ULTRACOOL DWARFS
  • EVOLUTIONARY MODELS
  • COOL NEIGHBORS
  • DARK-MATTER

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