Time evolution of the stellar surface rotation velocity when the orbits of planets with 10 (blue dotted curves) and 30 M_Jup (red dotted curves) shrink, compared to the surface velocity evolution of the star without any planet (continuous green curve). Three dotted curves are shown per planet for three initial distances from the star: the lower curves correspond to 0.01 au, and these follow the same path whatever the mass of the planet, coinciding with the green curve. The middle and upper curves correspond to initial distances equal to 0.02 and 0.03 au, respectively.