Evolution of the rotation of 55 Cnc e as a function of the eccentricity for different initial θ values and τ = 10¹ yr. The initial rotation rate is Ω /n ≈ 4.1, but since the initial shape of the planet is perfectly spherical (J₂ = C₂₂ = S₂₂ = 0), the initial rotation is chaotic and the spin may be trapped in different spin-orbit resonances. As the eccentricity decreases, the higher-order resonances become unstable, and the spin successively quits them, until it reaches the synchronous rotation.