Ratio between the tidal and magnetic torques as a function of the stellar rotation period for our reference case (solid line) and for a similar star–planet system with P_rot,ini = 9 days and a_ini = 0.025 AU (dotted line). In gray: regions where the overall migration timescale is greater than the age of the universe. Blue background:magnetic dominance. Red background: tidal dominance. The white circles correspond to the beginning of the evolution. The white squares correspond to the ZAMS. The orange circles correspond to solar age.