We propose to use the unique capabilities offered by ISO to obtain
broad band imaging & low resolution mid-infrared spectrum of the newly
discovered brown  dwarf DENIS-P J0205-1159 (1).
A large fraction of the energy is emitted in that wavelength range.
Old brown dwarfs, like our new isolated objects, have cooled to sufficiently
low temperatures that dust forms in their atmospheres (Allard 1997, Tenerife BD
conference). Their atmospheric structure is still poorly understood. It is thus
essential that the atmospheric models can be constrained by observed energy
distributions, and especially important is the SED in the mid-IR where
continuum blanketing by dust will occur. Spectroscopy of one Brown Dwarf would
test the models and lead to a better understanding of Brown Dwarf atmospheres.
(1) Delfosse et al., Astronomy and Astrophysics (in press);
Martin et al., Astronomy and Astrophysics (in press);
Tinney et al., Astrophysical Journal Letter (in press);