Serendipitous discovery of seven new southern L-dwarfs

Abstract

We report the discovery of seven hitherto unknown L-dwarfs found as a result of a spectroscopic search for distant AGB stars. Their far-red and near-infrared colours are very similar to known dwarfs of the same spectral type. One new object is among the ~30 brightest L-dwarfs, with K_s=12.12, and is nearby, ~20pc. Using low resolution spectroscopy from the Danish 1.54 m ESO telescope, spectral types in the range L0.5 - L5 are derived for these seven L-dwarfs by direct comparison to L-type standards taken from Kirkpatrick et al. (1999). Distances are determined from existing calibrations, and together with measured proper motions, yield kinematics for the seven new dwarfs consistent with that expected for the solar neighbourhood disk population.

arXiv comment8 pages, 11 figures, accepted by A&A

References in corpus (13)

• A Non-Gray Theory of Extrasolar Giant Planets and Brown Dwarfs
• Astrometry and Photometry for Cool Dwarfs and Brown Dwarfs
• The SuperCOSMOS Sky Survey. Paper I: Introduction and Description
• Towards Spectral Classification of L and T Dwarfs: Infrared and Optical Spectroscopy and Analysis
• Characterization of M,L and T dwarfs in the Sloan Digital Sky Survey
• The SuperCOSMOS Sky Survey. Paper II: Image detection, parameterisation, classification and photometry
• Brown Dwarfs in the Pleiades Cluster Confirmed by the Lithium Test
• The SuperCOSMOS Sky Survey. Paper III: Astrometry
• Four nearby L dwarfs
• L Dwarfs Found in Sloan Digital Sky Survey Commissioning Imaging Data
• A Flaring L5 Dwarf: The Nature of HαEmission in Very Low Mass (Sub)Stellar Objects
• L Dwarfs Found in Sloan Digital Sky Survey Commissioning Data II. Hobby-Eberly Telescope Observations
• Discovery of three nearby L dwarfs in the Southern Sky

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• Photometry and Proper Motions of M, L, and T Dwarfs from the Pan-STARRS1 3$\pi$ Survey
• A Volume-Limited Sample of Ultracool Dwarfs. I. Construction, Space Density, and a Gap in the L/T Transition
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• The Ultracool SpeXtroscopic Survey. I. Volume-Limited Spectroscopic Sample and Luminosity Function of M7$-$L5 Ultracool Dwarfs
• Ultra-cool dwarfs: new discoveries, proper motions, and improved spectral typing from SDSS and 2MASS photometric colors
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• Identifying Ultra-Cool Dwarfs at Low Galactic Latitudes: A Southern Candidate Catalogue
• Cool carbon stars in the halo II. A study of 25 new objects
• Parallaxes of southern extremely cool objects III: 118 L \& T dwarfs
• Large Scale Searches for Brown Dwarfs and Free-Floating Planets
• The Gaia Ultracool Dwarf Sample -- IV. GTC/OSIRIS optical spectra of Gaia late-M and L dwarfs
• SpeX Spectroscopy of Unresolved Very Low-Mass Binaries. I. Identification of Seventeen Candidate Binaries Straddling the L Dwarf/T Dwarf Transition