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

H. Bouy, N. Huélamo, C. Pinte, J. Olofsson, D. Barrado Y Navascués, E. L. Martín, E. Pantin, J. L. Monin, G. Basri, J. C. Augereau, F. Ménard, G. Duvert, G. Duchêne, F. Marchis, A. Bayo, S. Bottinelli, B. Lefort, S. Guieu

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Abstract

Aims. To improve our understanding of substellar formation, we have performed a compositional and structural study of a brown dwarf disk. Methods. We present the results of photometric, spectroscopic, and imaging observations of 2MASS J04442713+2512164, a young brown dwarf (M 7.25) 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 range to the millimeter, including the first photometric measurement of a brown dwarf disk at 3.7 mm, and allows us to perform a detailed analysis of the disk properties. Results. The target was known to have a disk. High-resolution optical spectroscopy shows that it is accreting intensely, and powers both a jet and an outflow. The disk structure is similar to what is 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 (1.5 μm). Crystalline silicates are significantly more abundant in the outer part and/or deeper layers of the disk, implying very efficient mixing and/or additional annealing processes. Submillimeter and millimeter data indicate that most of the disk mass is in large grains (> 1 mm).

Original languageEnglish
Pages (from-to)877-890
Number of pages14
JournalAstronomy and Astrophysics
Volume486
Issue number3
DOIs
Publication statusPublished - 1 Aug 2008
Externally publishedYes

Keywords

  • Stars: circumstellarmatter
  • Stars: formation
  • Stars: low-mass, brown dwarfs

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