WISEP J004701.06+680352.1: An intermediate surface gravity, dusty brown dwarf in the AB Dor Moving Group

Abstract

We present spectroscopy, astrometry, and photometry of the brown dwarf WISEP J004701.06+680352.1 (W0047+68), an unusually red field L dwarf at a distance of $12.2\pm 0.4$ parsecs. The three-dimensional space motion identifies it as a member of the AB Dor Moving Group, an identification supported by our classification of W0047+68 as intermediate surface gravity (INT-G) using the Allers \& Liu (2013) near-infrared classification system. This moving group membership implies near-solar metallicity, age $\sim 100-125$ Myr, $M\approx 0.018M_{\odot }$, and $\log g\approx 4.5$; the thick condensate clouds needed to explain the infrared spectrum are therefore a result of the lower surface gravity than ordinary field brown dwarfs. From the observed luminosity and evolutionary model radius, we find $T_{eff}\approx 1300$K, a temperature normally associated with early T dwarfs. Thick clouds are also used to explain the spectral properties of directly imaged giant planets, and we discuss the successes and challenges for such substellar models in matching the observed optical and infrared spectra. W0047+68 shows that cloud thickness is more sensitive to intermediate surface gravity than in most models. We also present a trigonometric parallax of the dusty L6 dwarf 2MASS J21481628+4003593. It lies at $8.060\pm 0.036$ parsecs; its astrometry is consistent with the view that it is older and metal-rich.

arXiv commentApJ, accepted

References in corpus (76)

• Direct Imaging of Multiple Planets Orbiting the Star HR 8799
• A Non-Gray Theory of Extrasolar Giant Planets and Brown Dwarfs
• Evolutionary models for very-low-mass stars and brown dwarfs with dusty atmospheres
• A Method of Correcting Near-Infrared Spectra for Telluric Absorption
• The Pan-STARRS1 Photometric System
• Images of a fourth planet orbiting HR 8799
• Models of Stars, Brown Dwarfs and Exoplanets
• Precipitating Condensation Clouds in Substellar Atmospheres
• A Giant Planet Candidate near a Young Brown Dwarf
• Evolutionary models for low-mass stars and brown dwarfs: uncertainties and limits at very young ages
• 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
• A Unified Near Infrared Spectral Classification Scheme for T Dwarfs
• L' and M' Photometry of Ultracool Dwarfs
• Late-type stars members of young stellar kinematic groups - I. Single stars
• Preliminary Parallaxes of 40 L and T Dwarfs from the U.S. Naval Observatory Infrared Astrometry Program
• Detection of Carbon Monoxide and Water Absorption Lines in an Exoplanet Atmosphere
• 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
• Further Defining Spectral Type "Y" and Exploring the Low-mass End of the Field Brown Dwarf Mass Function
• Clouds and Chemistry: Ultracool Dwarf Atmospheric Properties from Optical and Infrared Colors
• Clouds and Chemistry in the Atmosphere of Extrasolar Planet HR8799b
• A Near-Infrared Spectroscopic Study of Young Field Ultracool Dwarfs
• S4N: A Spectroscopic Survey of Stars in the Solar Neighborhood
• Atmospheric Parameters of Field L and T Dwarfs
• The Deuterium-Burning Mass Limit for Brown Dwarfs and Giant Planets
• Young L Dwarfs Identified in the Field: A Preliminary Low-Gravity, Optical Spectral Sequence from L0 to L5
• BANYAN. II. Very Low Mass and Substellar Candidate Members to Nearby, Young Kinematic Groups With Previously Known Signs of Youth
• The Brown Dwarf Kinematics Project (BDKP). III. Parallaxes for 70 Ultracool Dwarfs
• Masses, Radii, and Cloud Properties of the HR 8799 Planets
• Photometric Variability of the T2.5 Brown Dwarf SIMP J013656.5+093347; Evidence for Evolving Weather Patterns
• Atmospheric Chemistry in Giant Planets, Brown Dwarfs, and Low-Mass Dwarf Stars III. Iron, Magnesium, and Silicon
• HST Spectral Mapping of L/T Transition Brown Dwarfs Reveals Cloud Thickness Variations
• The Extremely Red, Young L Dwarf PSO J318-22: A Free-Floating Planetary-Mass Analog to Directly Imaged Young Gas-Giant Planets
• A Sample of Very Young Field L Dwarfs and Implications for the Brown Dwarf "Lithium Test" at Early Ages
• Near-Infrared Spectroscopy of the Extrasolar Planet HR 8799 b
• Large Amplitude Variations of an L/T Transition Brown Dwarf: Multi-Wavelength Observations of Patchy, High-Contrast Cloud Features
• The NIRSPEC Ultracool Dwarf Radial Velocity Survey
• Dust in Brown Dwarfs and Extra-solar Planets I. Chemical composition and spectral appearance of quasi-static cloud layers
• The nearest young moving groups
• Model atmospheres for massive gas giants with thick clouds: Application to the HR 8799 planets and predictions for future detections
• 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
• The Dependence of Brown Dwarf Radii on Atmospheric Metallicity and Clouds: Theory and Comparison with Observations
• The Age of AB Dor
• First Light LBT AO Images of HR 8799 bcde at 1.65 and 3.3 Microns: New Discrepancies between Young Planets and Old Brown Dwarfs
• Reconnaissance of the HR 8799 Exosolar System I: Near IR Spectroscopy
• The role of convection, overshoot, and gravity waves for the transport of dust in M dwarf and brown dwarf atmospheres
• Dust in brown dwarfs and extra-solar planets II. Cloud formation for cosmologically evolving abundances
• The Gemini NICI Planet-Finding Campaign : Discovery of a Substellar L Dwarf Companion to the Nearby Young M Dwarf CD-35 2722
• Origin and evolution of moving groups I. Characterization in the observational kinematic-age-metallicity space
• A Combined VLT and Gemini Study of the Atmosphere of the Directly-Imaged Planet, beta Pictoris b
• Planets Around Low-Mass Stars (PALMS). III. A Young Dusty L Dwarf Companion at the Deuterium-Burning Limit
• 3.6-7.9 um Photometry of L and T Dwarfs and the Prevalence of Vertical Mixing in their Atmospheres
• Planets Around Low-Mass Stars (PALMS). I. A Substellar Companion to the Young M Dwarf 1RXS J235133.3+312720
• A Kine-Chemical Investigation of the AB Dor Moving Group "Stream"
• Dust in the Photospheric Environment III. A Fundamental Element in the Characterization of Ultracool Dwarfs
• Discovery of an Unusually Red L-type Brown Dwarf
• CFBDSIR2149-0403: a 4-7 Jupiter-mass free-floating planet in the young moving group AB Doradus ?
• Elemental abundances of low-mass stars in nearby young associations: AB Doradus, Carina Near, and Ursa Major
• Nearby M, L, and T Dwarfs Discovered by the Wide-field Infrared Survey Explorer (WISE)
• AKARI Observations of Brown Dwarfs. III. CO, CO2 and CH4 Fundamental Bands and Physical Parameters
• Search for associations containing young stars (SACY):II. Chemical abundances of stars in 11 young Associations in the Solar neighborhood
• The Metallicity of the Pleiades
• Spectroscopy across the brown dwarf/planetary mass boundary - I. Near-infrared JHK spectra
• Discovery of a Young L Dwarf Binary, SDSS J224953.47+004404.6AB
• The extremely red L dwarf ULAS J222711$-$004547 - dominated by dust
• The velocity distribution of nearby stars from Hipparcos data I. The significance of the moving groups
• On the Radii of Brown Dwarfs Measured with AKARI Near-Infrared Spectroscopy
• Near-infrared low-resolution spectroscopy of Pleiades L-type brown dwarfs
• The Trigonometric Parallax of the Brown Dwarf Planetary System 2MASSW J1207334-393254
• On the common origin of the AB Dor moving group and the Pleiades cluster
• Kinematics of planet-host stars and their relation with dynamical streams in the solar neighbourhood
• New constraints on the formation and settling of dust in the atmospheres of young M and L dwarfs

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• Fundamental Parameters and Spectral Energy Distributions of Young and Field Age Objects with Masses Spanning the Stellar to Planetary Regime
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• Planets Around Low-Mass Stars (PALMS). VI. Discovery of a Remarkably Red Planetary-Mass Companion to the AB Dor Moving Group Candidate 2MASS J22362452+4751425
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• The Hawaii Infrared Parallax Program. III. 2MASS J0249-0557 c: A Wide Planetary-mass Companion to a Low-mass Binary in the beta Pic Moving Group
• Cloud Atlas: Hubble Space Telescope Near-Infrared Spectral Library of Brown Dwarfs, Planetary-mass companions, and hot Jupiters
• The B-Star Exoplanet Abundance Study: a co-moving 16-25 Mjup companion to the young binary system HIP 79098
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• Characterizing HR3549B using SPHERE
• Orbital and spectral characterization of the benchmark T-type brown dwarf HD 19467B
• Early Results from VLT-SPHERE: Long-Slit Spectroscopy of 2MASS 0122-2439B, a Young Companion Near the Deuterium Burning Limit
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• The First Brown Dwarf/Planetary-Mass Object in the 32 Orionis Group
• A Wide Planetary Mass Companion Discovered Through the Citizen Science Project Backyard Worlds: Planet 9
• Spectral library of age-benchmark low-mass stars and brown dwarfs
• Orbiting a binary: SPHERE characterisation of the HD 284149 system
• Spitzer Light Curves of the Young, Planetary-Mass TW Hya Members 2MASS J11193254-1137466AB and WISEA J114724.10-204021.3
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• Radial Velocities, Space Motions, and Nearby Young Moving Group Memberships of Eleven Candidate Young Brown Dwarfs
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• COol Companions ON Ultrawide orbiTS (COCONUTS). III. A Very Red L6 Benchmark Brown Dwarf around a Young M5 Dwarf
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