VLA observations of the disk around the young brown dwarf 2MASS J044427+2512

Abstract

We present multi-wavelength radio observations obtained with the VLA of the protoplanetary disk surrounding the young brown dwarf 2MASS J04442713+2512164 (2M0444) in the Taurus star forming region. 2M0444 is the brightest known brown dwarf disk at millimeter wavelengths, making this an ideal target to probe radio emission from a young brown dwarf. Thermal emission from dust in the disk is detected at 6.8 and 9.1 mm, whereas the 1.36 cm measured flux is dominated by ionized gas emission. We combine these data with previous observations at shorter sub-mm and mm wavelengths to test the predictions of dust evolution models in gas-rich disks after adapting their parameters to the case of 2M0444. These models show that the radial drift mechanism affecting solids in a gaseous environment has to be either completely made inefficient, or significantly slowed down by very strong gas pressure bumps in order to explain the presence of mm/cm-sized grains in the outer regions of the 2M0444 disk. We also discuss the possible mechanisms for the origin of the ionized gas emission detected at 1.36 cm. The inferred radio luminosity for this emission is in line with the relation between radio and bolometric luminosity valid for for more massive and luminous young stellar objects, and extrapolated down to the very low luminosity of the 2M0444 brown dwarf.

9 pages, 5 figures, accepted for publication in ApJ

References in corpus (20)

• Gas- and dust evolution in protoplanetary disks
• Ring shaped dust accumulation in transition disks
• UV excess measures of accretion onto young very low-mass stars and brown dwarfs
• Exploring brown dwarf disks: A 1.3 mm survey in Taurus
• The Coupled Physical Structure of Gas and Dust in the IM Lup Protoplanetary Disk
• VLBA determination of the distance to nearby star-forming regions I. The distance to T Tauri with 0.4% accuracy
• A Survey for New Members of Taurus with the Spitzer Space Telescope
• UV Radiation Fields Produced by Young Embedded Star Clusters
• The potential for Earth-mass planet formation around brown dwarfs
• Brown dwarf disks with ALMA: evidence for truncated dust disks in Ophiuchus
• Brown dwarf disks with ALMA
• 3D MHD Simulations of Planet Migration in Turbulent Stratified Disks
• IC348-SMM2E: a Class 0 proto-brown dwarf candidate forming as a scaled-down version of low-mass stars
• Low EUV Luminosities Impinging on Protoplanetary Disks
• Structural and compositional properties of brown dwarf disks: the case of 2MASS J04442713+2512164
• The Detection and Characterization of cm Radio Continuum Emission from the Low-mass Protostar L1014-IRS
• ALMA Observations of the Young Substellar Binary System 2M1207
• The Mysterious Dimmings of the T Tauri Star V1334 Tau
• Radio Monitoring of Protoplanetary Discs
• Theory of planet formation

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• Pebble-driven Planet Formation around Very Low-mass Stars and Brown Dwarfs
• A case of simultaneous star and planet formation
• Size and structures of disks around very low mass stars in the Taurus star-forming region
• Upper limits on protolunar disc masses using ALMA observations of directly-imaged exoplanets
• The centimeter emission from planet-forming disks in Taurus
• Key Science Goals for the Next Generation Very Large Array (ngVLA): Report from the ngVLA Science Advisory Council