Spectral energy distribution simulations of a possible ring structure around the young, red brown dwarf G196-3B

Abstract

The origin of the very red optical and infrared colours of intermediate-age ($\sim$10 - 500 Myr) L-type dwarfs remains unknown. It has been suggested that low-gravity atmospheres containing large amounts of dust may account for the observed reddish nature. We explored an alternative scenario by simulating protoplanetary and debris discs around G196-3B, which is an L3 young brown dwarf with a mass of $\sim 15$ $M_{\mathrm{Jup}}$ and an age in the interval 20 - 300 Myr. The best-fit solution to G196-3B's photometric spectral energy distribution from optical wavelengths through 24 $\mu$m corresponds to the combination of an unreddened L3 atmosphere ($T_{\mathrm{eff}}\approx 1870$~K) and a warm ($\approx$ 1280 K), narrow ($\approx$ 0.07 - 0.11 R${}_{\odot }$) debris disc located at very close distances ($\approx$ 0.12 - 0.20 R${}_{\odot }$) from the central brown dwarf. This putative, optically thick, dusty belt, whose presence is compatible with the relatively young system age, would have a mass $\ge 7\times 10^{-10}$ M${}_{\oplus }$ comprised of sub-micron/micron characteristic dusty particles with temperatures close to the sublimation threshold of silicates. Considering the derived global properties of the belt and the disc-to-brown dwarf mass ratio, the dusty ring around G196-3B may resemble the rings of Neptune and Jupiter, except for its high temperature and thick vertical height ($\approx 6\times 10^3$ km). Our inferred debris disc model is able to reproduce G196-3B's spectral energy distribution to a satisfactory level of achievement.

arXiv comment12 pages, 7 figures, 4 tables, accepted for publication in MNRAS

References in corpus (77)

• Spectral Energy Distributions of T Tauri Stars With Passive Circumstellar Disks
• The Limiting Effects of Dust in Brown Dwarf Model Atmospheres
• Models of Stars, Brown Dwarfs and Exoplanets
• Passive irradiated circumstellar disks with an inner hole
• Astrometry and Photometry for Cool Dwarfs and Brown Dwarfs
• Sixty-seven Additional L Dwarfs Discovered by the Two Micron All Sky Survey (2MASS)
• Preliminary Parallaxes of 40 L and T Dwarfs from the U.S. Naval Observatory Infrared Astrometry Program
• Accretion in Young Stellar/Substellar Objects
• The First Hundred Brown Dwarfs Discovered by the Wide-field Infrared Survey Explorer (WISE)
• Dust Properties of Protoplanetary Disks in the Taurus-Auriga Star Forming Region from Millimeter Wavelengths
• 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
• 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
• A Near-Infrared Spectroscopic Study of Young Field Ultracool Dwarfs
• Young L Dwarfs Identified in the Field: A Preliminary Low-Gravity, Optical Spectral Sequence from L0 to L5
• Masses, Radii, and Cloud Properties of the HR 8799 Planets
• Unveiling the Inner Disk Structure of T Tauri Stars
• Dust grain growth in rho-Ophiuchi protoplanetary disks
• The Disk Population of the Upper Scorpius Association
• On the Interferometric Sizes of Young Stellar Objects
• The Formation and Early Evolution of Low-mass Stars and Brown Dwarfs
• The Extremely Red, Young L Dwarf PSO J318-22: A Free-Floating Planetary-Mass Analog to Directly Imaged Young Gas-Giant Planets
• Discovery of a Very Young Field L Dwarf, 2MASS J01415823-4633574
• Formation and Evolution of Planetary Systems (FEPS): Properties of Debris Dust around Solar-type Stars
• Identifying Young Brown Dwarfs Using Gravity-Sensitive Spectral Features
• Disk evolution in the solar neighborhood. I Disk frequencies from 1 to 100 Myr
• Discovery of a young planetary mass companion to the nearby M dwarf VHS J125601.92-125723.9
• Discovery of Two Nearby, Peculiar L Dwarfs from the 2MASS Proper Motion Survey: Young or Metal-Rich?
• 2MASSJ035523.51+113337.4: A Young, Dusty, Nearby, Isolated Brown Dwarf Resembling A Giant Exoplanet
• STIS Coronagraphic Imaging of Fomalhaut: Main Belt Structure and the Orbit of Fomalhaut b
• Discovery of a Low-Mass Brown Dwarf Companion of the Young Nearby Star G196-3
• Exploring Brown Dwarf Disks
• The Solar Neighborhood XXXII. The Hydrogen Burning Limit
• Planetary Construction Zones in Occultation: Discovery of an Extrasolar Ring System Transiting a Young Sun-like Star and Future Prospects for Detecting Eclipses by Circumsecondary and Circumplanetary Disks
• Circumstellar material in the Vega inner system revealed by CHARA/FLUOR
• Formation of sharp eccentric rings in debris disks with gas but without planets
• Debris from terrestrial planet formation: the Moon-forming collision
• The Young Planet-mass Object 2M1207b: a cool, cloudy, and methane-poor atmosphere
• Near-infrared cross-dispersed spectroscopy of brown dwarf candidates in the Upper Sco association
• Protoplanetary Disk Masses from Stars to Brown Dwarfs
• Modeling giant extrasolar ring systems in eclipse and the case of J1407b: sculpting by exomoons?
• A near-infrared interferometric survey of debris disc stars. III. First statistics based on 42 stars observed with CHARA/FLUOR
• Discovery of a Planetary-Mass Brown Dwarf with a Circumstellar Disk
• Discovery of the Young L Dwarf WISE J1741102.78-464225.5
• 3.6-7.9 um Photometry of L and T Dwarfs and the Prevalence of Vertical Mixing in their Atmospheres
• Brown dwarf disks with ALMA
• Resolved Submillimeter Observations of the HR 8799 and HD 107146 Debris Disks
• Discovery of an Unusually Red L-type Brown Dwarf
• Disks around Brown Dwarfs in the Sigma Orionis Cluster
• The AU Microscopii Debris Disk: Multiwavelength Imaging and Modeling
• Herschel's "Cold Debris Disks": Background Galaxies or Quiescent Rims of Planetary Systems?
• CARMA interferometric observations of 2MASS J044427+2512: the first spatially resolved observations of thermal emission of a brown dwarf disk
• Space Velocities of L- and T-type Dwarfs
• Keck NIRC Observations of Planetary-mass Candidate Members in the sigma Orionis Open Cluster
• WISEP J004701.06+680352.1: An intermediate surface gravity, dusty brown dwarf in the AB Dor Moving Group
• WISE J163940.83-684738.6: A Y Dwarf identified by Methane Imaging
• Modeling the HD32297 Debris Disk with Far-IR Herschel Data
• ALMA observations of rho-Oph 102: grain growth and molecular gas in the disk around a young Brown Dwarf
• The extremely red L dwarf ULAS J222711$-$004547 - dominated by dust
• A Venus-Mass Planet Orbiting a Brown Dwarf: Missing Link between Planets and Moons
• Trigonometric parallaxes of young field L dwarfs
• Planet Signatures in Collisionally Active Debris Discs: scattered light images
• A Targeted Search for Peculiarly Red L and T Dwarfs in SDSS, 2MASS, and WISE: Discovery of a Possible L7 Member of the TW Hydrae Association
• The Coldest Brown Dwarf (Or Free Floating Planet)?: The Y Dwarf WISE 1828+2650
• Multi-wavelength modeling of the spatially resolved debris disk of HD 107146
• Discovery of the Y1 Dwarf WISE J064723.23-623235.5
• The lunar phases of dust grains orbiting Fomalhaut
• Observing planet-disk interaction in debris disks
• Discovery of a new Y dwarf: WISE J030449.03-270508.3
• Fomalhaut b as a Cloud of Dust: Testing Aspects of Planet Formation Theory
• Protoplanetary Disks in the Nearest Star-Forming Cloud: Mid-Infrared Imaging and Optical Spectroscopy of MBM 12 Members
• Infrared and kinematic properties of the substellar object G 196-3B
• A new free-floating planet in the Upper Scorpius association
• Brown Dwarf Disks at Ages of 5-10 Myr
• Discovery of Three Distant, Cold Brown Dwarfs in the WFC3 Infrared Spectroscopic Parallels Survey
• The Vertical Structure of the F Ring of Saturn from Ring-Plane Crossings

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