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In order to improve our understanding of substellar formation, we haveperformed a compositional and structural study of a brown dwarf disk.  We present the result of photometric, spectroscopic and imaging observationsof 2MASS J04442713+2512164, a young brown dwarf (M7.25) member of the Taurusassociation. Our dataset, combined with results from the literature, provides acomplete coverage of the spectral energy distribution from the optical to themillimeter including the first photometric measurement of a brown dwarf disk at3.7mm, and allows us to perform a detailed analysis of the disk properties.  The target was known to have a disk. High resolution optical spectroscopyshows that it is intensely accreting, and powers a jet and an outflow. The diskstructure is similar to that observed for more massive TTauri stars. Spectraldecomposition models of Spitzer/IRS spectra suggest that the mid-infraredemission from the optically thin disk layers is dominated by grains withintermediate sizes (1.5micron). Crystalline silicates are significantly moreabondant in the outer part and/or deeper layers of the disk, implying veryefficient mixing and/or additional annealing processes. Sub-millimeter andmillimeter data indicate that most of the disk mass is in large grains (>1mm)

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