Strong Brightness Variations Signal Cloudy-to-Clear Transition of Brown Dwarfs

Abstract

[ABRIDGED] We report the results of a $J$ band search for cloud-related variability in the atmospheres of 62 L4-T9 dwarfs using the Du Pont 2.5-m telescope at Las Campanas Observatory and the Canada France Hawaii Telescope on Mauna Kea. We find 9 of 57 objects included in our final analysis to be significantly variable with >99% confidence, 5 of which are new discoveries. In our study, strong sinusoidal signals (peak-to-peak amplitudes >2%) are confined to the L/T transition (4/16 objects with L9-T3.5 spectral types and 0/41 objects for all other spectral types). The probability that the observed occurrence rates for strong variability inside and outside the L/T transition originate from the same underlying true occurrence rate is excluded with >99.7% confidence. These observations suggest that the settling of condensate clouds below the photosphere in brown dwarf atmospheres does not occur in a spatially uniform manner. Rather, the formation and sedimentation of dust grains at the L/T transition is coupled to atmospheric dynamics, resulting in highly contrasting regions of thick and thin clouds and/or clearings. Outside the L/T transition we identify 5 weak variables (peak-to-peak amplitudes of 0.6%-1.6%). Excluding L9-T3.5 spectral types, we infer that $60_{-18}^{+22}$% of targets vary with amplitudes of 0.5%$-$1.6%, suggesting that surface heterogeneities are common among L and T dwarfs. Our survey establishes a significant link between strong variability and L/T transition spectral types, providing evidence in support of the hypothesis that cloud holes contribute to the abrupt decline in condensate opacity and 1 micron brightening observed in this regime. More generally, fractional cloud coverage is an important model parameter for brown dwarfs and giant planets, especially those with L/T transition spectral types and colors.

arXiv commentAccepted for publication in ApJ. 34 pages, 18 figures

References in corpus (116)

• Direct Imaging of Multiple Planets Orbiting the Star HR 8799
• Evolutionary models for very-low-mass stars and brown dwarfs with dusty atmospheres
• Precipitating Condensation Clouds in Substellar Atmospheres
• Astrometry and Photometry for Cool Dwarfs and Brown Dwarfs
• Sixty-seven Additional L Dwarfs Discovered by the Two Micron All Sky Survey (2MASS)
• The Hawaii Infrared Parallax Program. I. Ultracool Binaries and the L/T Transition
• Near-Infrared Photometry and Spectroscopy of L and T Dwarfs: the Effects of Temperature, Clouds, and Gravity
• Chemical Equilibrium Abundances in Brown Dwarf and Extrasolar Giant Planet Atmospheres
• A Unified Near Infrared Spectral Classification Scheme for T Dwarfs
• L' and M' Photometry of Ultracool Dwarfs
• Towards Spectral Classification of L and T Dwarfs: Infrared and Optical Spectroscopy and Analysis
• Rotation and Activity in Mid-M to L Dwarfs
• Neglected Clouds in T and Y Dwarf Atmospheres
• Preliminary Parallaxes of 40 L and T Dwarfs from the U.S. Naval Observatory Infrared Astrometry Program
• Characterization of M,L and T dwarfs in the Sloan Digital Sky Survey
• The Spectra of T Dwarfs I: Near-Infrared Data and Spectral Classification
• Binarity in Brown Dwarfs: T Dwarf Binaries Discovered with the Hubble Space Telescope WPFC2
• Meeting the Cool New Neighbors V: A 2MASS-Selected Sample of Ultracool Dwarfs
• The Discovery of Y Dwarfs Using Data from the Wide-field Infrared Survey Explorer (WISE)
• L and T Dwarf Models and the L to T Transition
• The 0.8-14.5 micron Spectra of Mid-L to Mid-T Dwarfs: Diagnostics of Effective Temperature, Grain Sedimentation, Gas Transport, and Surface Gravity
• Clouds and Chemistry: Ultracool Dwarf Atmospheric Properties from Optical and Infrared Colors
• The 2MASS Wide-Field T Dwarf Search. III. Seven New T Dwarfs and Other Cool Dwarf Discoveries
• Seventy-One New L and T Dwarfs from the Sloan Digital Sky Survey
• Multiplicity of Nearby Free-floating Ultra-cool Dwarfs: a HST-WFPC2 search for companions
• A Combined Subaru/VLT/MMT 1--5 Micron Study of Planets Orbiting HR 8799: Implications for Atmospheric Properties, Masses, and Formation
• The Brown Dwarf Kinematics Project (BDKP). III. Parallaxes for 70 Ultracool Dwarfs
• Masses, Radii, and Cloud Properties of the HR 8799 Planets
• Chromospheric Activity, Rotation, and Rotational Braking in M and L Dwarfs
• Evidence for Cloud Disruption in the L/T Dwarf Transition
• Photometric Variability of the T2.5 Brown Dwarf SIMP J013656.5+093347; Evidence for Evolving Weather Patterns
• Infrared Parallaxes for Methane T dwarfs
• Brown Dwarfs and the TW Hya Association
• Discovery of Two T Dwarf Companions with the Spitzer Space Telescope
• Activity in Very Cool Stars: Magnetic Dissipation in late-M and L Dwarf Atmospheres
• HST Spectral Mapping of L/T Transition Brown Dwarfs Reveals Cloud Thickness Variations
• Distances, Luminosities, and Temperatures of the Coldest Known Substellar Objects
• A search for L dwarf binary systems
• A Sample of Very Young Field L Dwarfs and Implications for the Brown Dwarf "Lithium Test" at Early Ages
• The Missing Link: Early Methane ("T") Dwarfs in the Sloan Digital Sky Survey
• A Patchy Cloud Model for the L to T Dwarf Transition
• Hubble Space Telescope NICMOS Observations of T Dwarfs: Brown Dwarf Multiplicity and New Probes of the L/T Transition
• Large Amplitude Variations of an L/T Transition Brown Dwarf: Multi-Wavelength Observations of Patchy, High-Contrast Cloud Features
• The Discovery of a Field Methane Dwarf from Sloan Digital Sky Survey Commissioning Data
• The Mauna Kea Observatories Near-Infrared Filter Set. III. Isophotal Wavelengths and Absolute Calibration
• Hubble Space Telescope Observations of Binary Very-Low-Mass Stars and Brown Dwarfs
• Four nearby L dwarfs
• Binaries and the L Dwarf/T Dwarf Transition
• Mid-Infrared Photometry of Cold Brown Dwarfs: Diversity in Age, Mass and Metallicity
• The Spectra of T Dwarfs. II. Red Optical Data
• Subtle Signatures of Multiplicity in Late-type Dwarf Spectra: The Unresolved M8.5 + T5 Binary 2MASS J03202839-0446358
• Discovery of 11 New T Dwarfs in the Two Micron All-Sky Survey, Including a Possible L/T Transition Binary
• Variability in ultra cool dwarfs: evidence for the evolution of surface features
• L-dwarf variability: I-band observations
• Atmospheric dynamics of brown dwarfs and directly imaged giant planets
• L Dwarfs Found in Sloan Digital Sky Survey Commissioning Imaging Data
• A search for binary systems among the nearest L dwarfs
• HD 203030B: an Unusually Cool Young Sub-Stellar Companion near the L/T Transition
• Vertical Atmospheric Structure in a Variable Brown Dwarf: Pressure-dependent Phase Shifts in Simultaneous Hubble Space Telescope-Spitzer Light Curves
• Clouds, Gravity and Metallicity in Blue L dwarfs: The Case of 2MASS J11263991-5003550
• Reconnaissance of the HR 8799 Exosolar System I: Near IR Spectroscopy
• Brown Dwarf Photospheres are Patchy: A Hubble Space Telescope Near-infrared Spectroscopic Survey Finds Frequent Low-level Variability
• The discovery of a very cool, very nearby brown dwarf in the Galactic plane
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• Spectroscopic rotational velocities of brown dwarfs
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• Weather on the Nearest Brown Dwarfs: Resolved Simultaneous Multi-Wavelength Variability Monitoring of WISE J104915.57-531906.1AB
• Resolved Near-Infrared Spectroscopy of WISE J104915.57-531906.1AB: A Flux-Reversal Binary at the L dwarf/T dwarf Transition
• Atmospheric Circulation of Brown Dwarfs: Jets, Vortices, and Time Variability
• CFBDSIR J1458+1013B: A Very Cold (>T10) Brown Dwarf in a Binary System
• The Brown dwarf Atmosphere Monitoring (BAM) Project I: The largest near-IR monitoring survey of L- & T-dwarfs
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• Parallaxes of Southern Extremely Cool objects - I: Targets, Proper motions and first results
• SDSS J141624.08+134826.7: A Nearby Blue L Dwarf From the Sloan Digital Sky Survey
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• NPARSEC: NTT Parallaxes of Southern Extremely Cool objects. Goals, targets, procedures and first results
• Weather on Other Worlds I: Detection of Periodic Variability in the L3 Dwarf DENIS-P J1058.7-1548 with Precise Multi-Wavelength Photometry
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• Limits on the infrared photometric monitoring of brown dwarfs
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• Periodic Optical Variability of Radio Detected Ultracool Dwarfs
• DENIS J081730.0-615520: An overlooked mid-T dwarf in the solar neighborhood
• Characterization of the Nearby L/T Binary Brown Dwarf WISE J104915.57-531906.1 at 2 Parsecs from the Sun
• Discovery of a 66 mas Ultracool Binary with Laser Guide Star Adaptive Optics
• A Search for Photometric Variability in L and T type Brown Dwarf Atmospheres
• Four new T dwarfs identified in PanSTARRS 1 commissioning data
• Dancing in the Dark: New Brown Dwarf Binaries from Kernel Phase Interferometry
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• CLOUDS search for variability in brown dwarf atmospheres
• Initial mass function effects on the colour evolution of disk galaxies
• The 2MASS Wide-Field T Dwarf Search. V. Discovery of a T Dwarf via Methane Imaging
• Observations of Ultracool dwarfs with ULTRACAM on the VLT: a search for weather
• Resolving the L/T transition binary SDSS J2052-1609 AB
• SIMP: A Near-Infrared Proper Motion Survey

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