Structural and compositional properties of brown dwarf disks: the case of 2MASS J04442713+2512164

Abstract

In order to improve our understanding of substellar formation, we have performed a compositional and structural study of a brown dwarf disk. We present the result of photometric, spectroscopic and imaging observations of 2MASS J04442713+2512164, a young brown dwarf (M7.25) member of the Taurus association. Our dataset, combined with results from the literature, provides a complete coverage of the spectral energy distribution from the optical to the millimeter including the first photometric measurement of a brown dwarf disk at 3.7mm, and allows us to perform a detailed analysis of the disk properties. The target was known to have a disk. High resolution optical spectroscopy shows that it is intensely accreting, and powers a jet and an outflow. The disk structure is similar to that observed for more massive TTauri stars. Spectral decomposition models of Spitzer/IRS spectra suggest that the mid-infrared emission from the optically thin disk layers is dominated by grains with intermediate sizes (1.5micron). Crystalline silicates are significantly more abondant in the outer part and/or deeper layers of the disk, implying very efficient mixing and/or additional annealing processes. Sub-millimeter and millimeter data indicate that most of the disk mass is in large grains (>1mm)

17 pages, 10 figures, 7 tables, accepted for A&A

References in corpus (10)

• Monte Carlo radiative transfer in protoplanetary disks
• Accretion Rates in Herbig Ae stars
• Exploring brown dwarf disks: A 1.3 mm survey in Taurus
• A Survey for Spectroscopic Binaries Among Very Low-Mass Stars
• A Survey for New Members of Taurus with the Spitzer Space Telescope
• Dust Processing in Disks around T Tauri Stars
• Hubble and Spitzer Observations of an Edge-on Circumstellar Disk around a Brown Dwarf
• Discovery of a Bipolar Outflow from 2MASSW J1207334-393254, A 24 Jupiter Mass Brown Dwarf
• Crystalline silicates as a probe of disk formation history
• Dust observations of Comet 9P/Tempel 1 at the time of the Deep Impact

Cited by in corpus (10)

• Brown dwarf disks with ALMA
• Ultracool Dwarfs Observed with the Spitzer Infrared Spectrograph. II. Emergence and Sedimentation of Silicate Clouds in L Dwarfs, and Analysis of the Full M5--T9 Field Dwarf Spectroscopic Sample
• The Taurus Boundary of Stellar/Substellar (TBOSS) Survey II. Disk Masses from ALMA Continuum Observations
• The Taurus Boundary of Stellar/Substellar (TBOSS) Survey I: far-IR disk emission measured with Herschel
• Brown dwarf disks with Herschel: Linking far-infrared and (sub)-mm fluxes
• Submillimeter Observations of the Young Low-Mass Object IRAS 04158+2805
• Modeling the Protoplanetary Disks of Two Brown Dwarfs in the Taurus Molecular Cloud
• VLA observations of the disk around the young brown dwarf 2MASS J044427+2512
• The disk around the brown dwarf KPNO Tau 3
• Near-Infrared Polarization from Unresolved Disks Around Brown Dwarfs and Young Stellar Objects