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We present 3D hydrodynamical models of the HD142527 protoplanetary disc, abright and well studied disc that shows spirals and shadows in scattered lightaround a 100 au gas cavity, a large horseshoe dust structure in mm continuumemission, together with mysterious fast radial flows and streamers seen in gaskinematics. By considering several possible orbits consistent with the observedarc, we show that all of the main observational features can be explained byone mechanism - the interaction between the disc and the observed binarycompanion. We find that the spirals, shadows and horseshoe are only produced inthe correct position angles by a companion on an inclined and eccentric orbitapproaching periastron - the 'red' family from Lacour et al. (2016). Dust-gassimulations show radial and azimuthal concentration of dust around the cavity,consistent with the observed horseshoe. The success of this model in theHD142527 disc suggests other mm-bright transition discs showing cavities,spirals and dust asymmetries may also be explained by the interaction withcentral companions.

Circumbinary, not transitional: On the spiral arms, cavity, shadows, fast radial flows, streamers and horseshoe in the HD142527 disc