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Title: 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 andmore » luminous young stellar objects, and extrapolated down to the very low luminosity of the 2M0444 brown dwarf.« less

Authors:
 [1];  [2];  [3];  [4];  [5];  [6]
  1. Department of Physics and Astronomy, Rice University, 6100 Main Street, Houston, TX 77005 (United States)
  2. The Kinkaid School, 201 Kinkaid School Drive, Houston, TX 77024 (United States)
  3. Department of Astronomy Steward Observatory, The University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721 (United States)
  4. Max-Planck-Institut fur Extraterrestrische Physik, Giessenbachstrasse 1, D-85748 Garching (Germany)
  5. University Observatory, Faculty of Physics, Ludwig-Maximilians-Universität München, Scheinerstr. 1, D-81679 Munich (Germany)
  6. European Southern Observatory (ESO) Headquarters, Karl-Schwarzschild-Str. 2, D-85748 Garching (Germany)
Publication Date:
OSTI Identifier:
22663191
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 846; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BOLOMETERS; COSMIC DUST; DWARF STARS; EMISSION; FORECASTING; LUMINOSITY; PLANETS; PROTOPLANETS; SATELLITES; SOLIDS; STAR EVOLUTION; STARS; WAVELENGTHS

Citation Formats

Ricci, L., Rome, H., Pinilla, P., Facchini, S., Birnstiel, T., and Testi, L., E-mail: luca.ricci@rice.edu. VLA Observations of the Disk around the Young Brown Dwarf 2MASS J044427+2512. United States: N. p., 2017. Web. doi:10.3847/1538-4357/AA81BF.
Ricci, L., Rome, H., Pinilla, P., Facchini, S., Birnstiel, T., & Testi, L., E-mail: luca.ricci@rice.edu. VLA Observations of the Disk around the Young Brown Dwarf 2MASS J044427+2512. United States. doi:10.3847/1538-4357/AA81BF.
Ricci, L., Rome, H., Pinilla, P., Facchini, S., Birnstiel, T., and Testi, L., E-mail: luca.ricci@rice.edu. Fri . "VLA Observations of the Disk around the Young Brown Dwarf 2MASS J044427+2512". United States. doi:10.3847/1538-4357/AA81BF.
@article{osti_22663191,
title = {VLA Observations of the Disk around the Young Brown Dwarf 2MASS J044427+2512},
author = {Ricci, L. and Rome, H. and Pinilla, P. and Facchini, S. and Birnstiel, T. and Testi, L., E-mail: luca.ricci@rice.edu},
abstractNote = {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.},
doi = {10.3847/1538-4357/AA81BF},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 1,
volume = 846,
place = {United States},
year = {2017},
month = {9}
}