Time resolved spectroscopy of the variable brown dwarf Kelu-1

Abstract

We report the results of observations designed to investigate the spectroscopic signatures of dust clouds on the L2 brown dwarf Kelu-1. Time resolved medium resolution spectra show no significant evidence of variability in the dust sensitive TiO, CrH and FeH bandheads on the timescale of 1--24 hours. We do however report periodic variability in the psuedo-equivelent width of H-alpha consistent with the 1.8 hour rotation period previously reported for this object Clarke, Tinney & Tolley (2002). Near-contemporaneous I-band photometry shows evidence for non-periodic variability at the level of 2%.

9 pages, 12 figures. MNRAS in press

References in corpus (12)

• The Limiting Effects of Dust in Brown Dwarf Model Atmospheres
• Precipitating Condensation Clouds in Substellar Atmospheres
• Astrometry and Photometry for Cool Dwarfs and Brown Dwarfs
• Clouds and Chemistry: Ultracool Dwarf Atmospheric Properties from Optical and Infrared Colors
• Brown Dwarf Companions to G-type Stars. I: Gliese 417B and Gliese 584C
• Activity in Very Cool Stars: Magnetic Dissipation in late-M and L Dwarf Atmospheres
• Variability in ultra cool dwarfs: evidence for the evolution of surface features
• Dust in the Photospheric Environment: Unified Cloudy Models of M, L, and T Dwarfs
• L-dwarf variability: I-band observations
• Periodic photometric variability of the brown dwarf Kelu-1
• A mini-survey for variability in early L dwarfs
• Dust clouds or magnetic spots? Exploring the atmospheres of L dwarfs with time-resolved spectrophotometry

Cited by in corpus (25)

• ExoMol Molecular linelists -- XXXIII. The spectrum of Titanium Oxide
• Weather on Other Worlds. II. Survey Results: Spots Are Ubiquitous on L and T Dwarfs
• Strong Brightness Variations Signal Cloudy-to-Clear Transition of Brown Dwarfs
• A Sensitive Search for Variability in Late L Dwarfs: The Quest for Weather
• Kelu-1 is a Binary L Dwarf: First Brown Dwarf Science from Laser Guide Star Adaptive Optics
• Spectroscopic rotation velocities of L dwarfs from VLT/UVES and their comparison with periods from photometric monitoring
• The NIRSPEC Brown Dwarf Spectroscopic Survey II: High-Resolution J-Band Spectra of M, L and T Dwarfs
• Kepler Monitoring of an L Dwarf I. The Photometric Period and White Light Flares
• Photometric variability of young brown dwarfs in the sigma Orionis open cluster
• Optical Linear Polarization of Late M- and L-Type Dwarfs
• Weather on Other Worlds I: Detection of Periodic Variability in the L3 Dwarf DENIS-P J1058.7-1548 with Precise Multi-Wavelength Photometry
• The Ultracool SpeXtroscopic Survey. I. Volume-Limited Spectroscopic Sample and Luminosity Function of M7$-$L5 Ultracool Dwarfs
• A Chandra X-ray detection of the L dwarf binary Kelu-1: Simultaneous Chandra and Very Large Array observations
• Variability and periodicity of field M dwarfs revealed by multichannel monitoring
• Evidence of Orbital Motion in the Binary Brown Dwarf Kelu-1AB
• Polarisation of very-low-mass stars and brown dwarfs
• Initial mass function effects on the colour evolution of disk galaxies
• CLOUDS search for variability in brown dwarf atmospheres
• Kepler Monitoring of an L Dwarf II. Clouds with Multiyear Lifetimes
• On the Correlation between L Dwarf Optical and Infrared Variability and Radio Aurorae
• The Deepest Constraints on Radio and X-ray Magnetic Activity in Ultracool Dwarfs from WISE J104915.57-531906.1
• Observations of Ultracool dwarfs with ULTRACAM on the VLT: a search for weather
• Correlated spectral variability in brown dwarfs
• Variability of Brown Dwarfs
• The search for planetary mass companions to field brown dwarfs with HST/NICMOS