  We analyze the hadronic and radiative decay modes of the recently observed
$D_{sJ}(2317)$ meson, in the hypothesis that it can be identifield with the
scalar $s_\ell^P={1\over 2}^+$ state of $c \bar s$ spectrum ($D_{s0}$). The
method is based on heavy quark symmetries and Vector Meson Dominance ansatz. We
find that the hadronic isospin violating mode $D_{s0} \to D_s \pi^0$ is
enhanced with respect to the radiative mode $D_{s0} \to D_s^* \gamma$. The
estimated width of the meson is
  $\Gamma(D_{s0})\simeq 7$ KeV.
