Spin evolution of HD 46703 for a model with T₀ = 3500 K, Ṁ₀ = 10^−6.3 M_⊙ yr⁻¹, and M_d, 0 = 10⁻² M_⊙. Upper panel: torques acting on the rotation of the post-AGB star due to accretion (dashed orange line), stellar winds (dotted green line), and tides (dash-dotted red line). Lower panel: evolution of the surface rotational velocity at the equator (orange line). The blue line gives the ratio Ω_spin/Ω_orb, which starts at co-rotation (=1).