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The nature of the recently discovered $Z_c$ and $Z_b$ structures isintriguing. Their charge forces its minimal quark content to be $Q\bar Q q\barq$ (where $Q=\{c,b\}$ and $q=\{u,d\}$). In this work we perform a molecularcoupled-channels calculation of the $I^G(J^{PC})=1^+(1^{+-})$ charm and bottomsectors in the framework of a constituent quark model which satisfactorilydescribes a wide range of properties of (non-)conventional hadrons containingheavy quarks. All the relevant channels are included for each sector, i.e.: The$D^{(\ast)}\bar D^{\ast}+h.c.$, $\pi J/\psi$ and $\rho\eta_c$ channels for the$Z_c$ and $B^{(\ast)}B^{\ast}$ and $\Upsilon(nS)\pi$ ($n=1,2,3$) channels forthe $Z_b$ analysis. Possible structures of these resonances will be discussed.

The charged $Z_c$ and $Z_b$ structures in a constituent quark model approach