Radiative transfer images showing the spirals formed by a 10 M_Jup planet at 140au. Left: synthetic polarized scattered light Q_ϕ image with an analogous Gaussian kernel to the one applied to Fig. 6, left. The dark central area shows the coronagraph coverage. Right: synthetic mm continuum image after subtracting the azimuthal average flux on the image planeto enhance the spirals, analogous to the procedure applied to Fig. 6, right. The red and white dots denote the location of the observed spirals for each image, respectively.