Regions for outward migration at different times for planets in type-I-migration using the torque expression of Paardekooper et al. (2011) for our standard disc structure with Zdust = 0.5%. If the planet is located inside the lines, it will migrate outwards. If the planet is outside the lines, it will migrate inwards. The small ticks on the top of the plot correspond to the location of the ice line at the times indicated by the different colours. The dotted lines for discs with t< 1 Myr mark regions of outward migration in discs, where the temperature of the disc reaches the silicate evaporation temperature at some point (r< 0.7 AU), making the calculation of the torque not reliable.
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