10-orbit temporal evolution (top panels) and power-spectrum (bottom panels) of the instantaneous inner Lindblad torque Γ_Li, for three epochs in the run ℳ₂₀₀ . Left panels: the planet is in a quasi-circular orbit and the 5-orbit averaged torque ⟨Γ_Li⟩_5orb is peaking in Fig. 4. Middle panels: the planet orbit becomes eccentric and ⟨Γ_Li⟩_5orb is peaking. Right panels: the planet orbit is eccentric and ⟨Γ_Li⟩_5orb does not vary. Depending on the epoch, we retrieve two typical frequencies ω_p ≃ 1 and ω_c ≃ 2 (vertical dotted lines).