  We investigate the $D_{s0}^\ast(2317)$ meson using lattice QCD and
considering correlation functions of several $\bar{c} s$ two-quark and $\bar{c}
s (\bar{u} u + \bar{d} d)$ four-quark interpolating fields. These interpolating
fields generate different structures in color, spin and position space
including quark-antiquark pairs, tetraquarks and two-meson scattering states.
For our computation we use an ensemble simulated with pion mass $m_\pi \approx
0.296 \, \textrm{GeV}$ and spatial volume of extent $2.90 \, \textrm{fm}$. We
find in addition to the expected spectrum of two-meson scattering states
another state around $60 \, \textrm{MeV}$ below the $D K$ threshold, which we
interpret as the $D_{s0}^\ast(2317)$ meson. This state couples predominantly to
a quark-antiquark interpolating field and only weakly to a $D K$ two-meson
interpolating field. The coupling to the tetraquark interpolating fields is
essentially zero, rendering a tetraquark interpretation of the
$D_{s0}^\ast(2317)$ meson rather unlikely. Moreover, we perform a scattering
analysis using L\"uscher's method and the effective range approximation to
determine the $D_{s0}^\ast(2317)$ mass for infinite spatial volume. We find
this mass $51 \, \textrm{MeV}$ below the $D K$ threshold, rather close to both
our finite volume result and the experimentally observed value.
