Escape from resonance in a two-planet system with convergent migration. The planet and disk parameters are m_i=1 M_⊕, m_o=10 M_⊕, τ_m=5 × 10⁵ yr and τ_m/τ_e=200. The system is temporarily trapped in a 2:1 MMR during t~2–3 × 10⁴ yr, and the inner planet reaches the equilibrium eccentricity with growing amplitude. The system escapes from resonance afterward, with e_i quickly damping to a very low value. Similarly, φ_i features an increasing libration amplitude during the trap and eventually oscillates from 0 to 2π. In phase space, the trajectory initially librates around the right fixed point (black dot). As the amplitude grows, it ultimately escapes from the fixed point and settles into the origin. See https://github.com/llh-astro/resonance/raw/main/gif/escape.gif