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Fig. 4


Sign of the total tidal torque as a function of the tidal frequency ω/n (horizontal axis) and orbital radius (a) (vertical axis) for two different cases. Top: with ω0 = 3.77 × 10-7 s-1 and ωM = 3.7 × 10-8 s-1 (ω0>ωM). Bottom: with T0 and ω0 depending on the star-planet distance and ωM>ω0. White (blue) areas correspond to positive (negative) torque. Blue (red) lines designate stable (unstable) states of equilibrium.

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