Talk abstract

We present a grid of models of accreting brown dwarf systems with
circumstellar discs. The calculations involve a self-consistent
solution of both vertical hydrostatic and radiative equilibrium
along with a sophisticated treatment of dust sublimation. Analysis
of the disc structures and simulated observations (SEDs and
photometric magnitudes) reveals a natural dichotomy in accretion
rates, with \logmdot $>-$9 and $\leq -$9 classed as extreme and
typical accretors respectively. Derivation of ages and masses from
our simulated photometry using isochrones is demonstrated to be
unreliable even for typical accretors. We also suggest improved
selection criteria in several colour indices. We show that as
accretion rates increase brown dwarf disc systems are less likely to
be correctly identified. This suggests that systems with higher
accretion rates would be preferentially lost during brown dwarf
target selection meaning observations used to assert a
$\dot{M}\propto M_*^2$ relationship may contain an intrinsic
selection bias. Finally, we present an online interface allowing
public access to the simulated grid and an associated online fitting
tool with uncertinaties and degeneracy analysis.