Königstuhl 17, Heidelberg, D-69117 Germany
e-mail:pascucci@mpia-hd.mpg.de
2 Astrophysical Inst. and University Obs. Jena
Schillergässchen 2-3, D-07745 Jena, Germany
Abstract:
We conducted mid-infrared observations of the brown dwarf
candidate Cha Hα2. We find that the predicted silicate
feature does not appear in its spectral energy distribution
(SED). In order to interpret the lack of this feature, we carried out analytical
calculations adopting both flared and flat disk geometries. We
show that, independently of the chosen parameter set and
chemical composition, the flared disk model cannot explain the
measured fluxes. On the contrary, the SED emerging from a flat
disk fits well the observations.
