Schematic of the evolution of a planetary system due to stellar mass loss and WD kicks. The figure depicts a multiplanet system, viewed nearly edge-on, that is initially compact, coplanar, and stable during its host star’s MS phase (left frame). During the AGB phase, the orbits expand but generally remain stable (middle frame). After becoming a WD and experiencing a WD formation kick, outer planets may become unbound, while the remaining planetary orbits obtain new eccentricities and inclinations, potentially triggering instabilities (right frame).