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We calculate the scattering amplitudes of Goldstone bosons off thepseudoscalar D-mesons in unitarized heavy meson chiral approach. The low energyconstants appearing in $\mathcal{O}(p^2)$ chiral Lagrangian are determined byfitting lattice simulations on $S$-wave scattering lengths. $D_{s0}^{*}(2317)$is obtained as a bound state in $(S,I)=(1,0)$ $DK$ channel. Possible boundstates or resonance states in other channels are investigated as well. Thequark mass dependence of the mass and binding energy of $D_{s0}^{*}(2317)$ isalso investigated, which indicates predominately $DK$ molecular nature.

Study on $0^+$ states with open charm in unitarized heavy meson chiral approach