  We report measurements of the properties of the $D_{sJ}^+(2317)$ and
$D_{sJ}^+(2457)$ resonances produced in continuum $e^+ e^-$ annihilation near
$\sqrt{s}=10.6 \mathrm{GeV}$. The analysis is based on an $86.9
\mathrm{fb^{-1}}$ data sample collected %at and 60 MeV below the $\Upsilon(4S)$
resonance with with the Belle detector at KEKB. We determine the masses to be
$M(D_{sJ}^+(2317)) = 2317.2 \pm 0.5(\mathrm{stat}) \pm 0.9(\mathrm{syst})
\mathrm{MeV}/c^2$ and $M(D_{sJ}^+(2457))=2456.5 \pm 1.3(\mathrm{stat}) \pm
1.3(\mathrm{syst}) \mathrm{MeV}/c^2$. We observe the radiative decay mode
$D_{sJ}^+(2457) \to D_s^+ \gamma$ and the dipion decay mode $D_{sJ}^+(2457) \to
D_s^+ \pi^+ \pi^-$, and determine their branching fractions. No corresponding
decays are observed for the $D_{sJ}(2317)$ state. These results are consistent
with the spin-parity assignments of $0^+$ for the $D_{sJ}(2317)$ and $1^+$ for
the $D_{sJ}(2457)$.
