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We study the light scalar sector up to $1.8$ GeV by using a quantum fieldtheoretical approach which includes a single kaonic state in a Lagrangian withboth derivative and non-derivative interactions. By performing a fit to $\pi K$phase shift data in the $I=1/2,$ $J=0$ channel, we show that$K_{0}^{\ast}(800)$ (or $\kappa$) emerges as a dynamically generated companionpole of $K_{0}^{\ast }(1430)$. This is a result of investigating quantumfluctuations with one kaon and one pion circulating in the loops dressing$K_{0}^{\ast}(1430)$. We determine the position of the poles on the complexplane in the context of our approach: for $K_{0}^{\ast}(1430)$ we get$(1.413\pm0.002)-i{0.02cm}(0.127\pm0.003)$ (in GeV), while for $\kappa$ we get$(0.746\pm0.019)-i{0.02cm}(0.262\pm0.014)$ (in GeV). The model-dependence ofthese results and related uncertainties are discussed in the paper. Alarge-$N_{c}$ study confirms that $K_{0}^{\ast}(1430)$ is predominantly aquarkonium and that $K_{0}^{\ast}(800)$ is a molecular-like dynamicallygenerated state.

$K_{0}^{\ast}(800)$ as a companion pole of $K_{0}^{\ast}(1430)$