Discovery of three nearby L dwarfs in the Southern Sky

Abstract

We report the discovery of three L dwarfs in the solar vicinity within 30 parsecs. These objects were originally found as proper motion objects from a combination of R and I photographic plates measured as part of the SuperCOSMOS Sky Surveys. We subsequently identified these objects as bona fide brown dwarf candidates on the basis of their R-I colour, as first criterion, and subsequently their J-K colours when the infrared data were available from the 2MASS database. Spectroscopic observations in the optical with the ESO 3.6m/EFOSC2 and in the near-infrared with the NTT/SOFI led to the classification of their spectral types as early L dwarfs.

4 pages including 2 figures, accepted for publication in Astronomy and Astrophysics Letters

References in corpus (8)

• The SuperCOSMOS Sky Survey. Paper I: Introduction and Description
• Towards Spectral Classification of L and T Dwarfs: Infrared and Optical Spectroscopy and Analysis
• The SuperCOSMOS Sky Survey. Paper II: Image detection, parameterisation, classification and photometry
• Near-Infrared Spectral Classification of late-M and L Dwarfs
• The SuperCOSMOS Sky Survey. Paper III: Astrometry
• NICS-TNG low-resolution 0.85-2.45um spectra of L-Dwarfs: a near-infrared spectral classification scheme for faint dwarfs
• L Dwarfs Found in Sloan Digital Sky Survey Commissioning Data II. Hobby-Eberly Telescope Observations
• 2MASSI J1315309-264951: An L Dwarf with Strong and Variable H-alpha Emission

Cited by in corpus (22)

• Meeting the Cool New Neighbors V: A 2MASS-Selected Sample of Ultracool Dwarfs
• Meeting the Cool Neighbors. IX. The Luminosity Function of M7-L8 Ultracool Dwarfs in the Field
• The Brown Dwarf Kinematics Project (BDKP) I. Proper Motions and Tangential Velocities for a Large Sample of Late-type M, L and T Dwarfs
• Radio Observations of a Large Sample of Late-M, L, and T Dwarfs: The Distribution of Magentic Field Strengths
• The Field Substellar Mass Function Based on the Full-sky 20-pc Census of 525 L, T, and Y Dwarfs
• Epsilon Indi B: a new benchmark T dwarf
• SpeX Spectroscopy of Unresolved Very Low Mass Binaries. II. Identification of Fourteen Candidate Binaries with Late-M/Early-L and T Dwarf Components
• 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
• Quiescent Radio Emission from Southern Late-type M Dwarfs and a Spectacular Radio Flare from the M8 Dwarf DENIS 1048-3956
• The 2MASS Wide-Field T Dwarf Search. I. Discovery of a Bright T Dwarf Within 10 pc of the Sun
• Spectroscopic classification of red high proper motion objects in the Southern Sky
• The Hawaii Infrared Parallax Program. IV. A Comprehensive Parallax Survey of L0-T8 dwarfs with UKIRT
• Parallaxes of Southern Extremely Cool objects (PARSEC) II: Spectroscopic Follow-up and Parallaxes of 52 Targets
• SSSPMJ0829-1309: A new nearby L dwarf detected in SuperCOSMOS Sky Surveys
• LSR0602+3910 - Discovery of a Bright Nearby L-type Brown Dwarf
• Search for nearby stars among proper motion stars selected by optical-to-infrared photometry. II. Two late M dwarfs within 10 pc
• A Very High Proper Motion Star and the First L dwarf in the Kepler Field
• Serendipitous discovery of seven new southern L-dwarfs
• Identifying Ultra-Cool Dwarfs at Low Galactic Latitudes: A Southern Candidate Catalogue
• Parallaxes of southern extremely cool objects III: 118 L \& T dwarfs
• An active M8.5 dwarf wide companion to the M4/DA binary LHS4039/LHS4040