The missing mass conundrum of post-common-envelope planetary nebulae
The missing mass conundrum of post-common-envelope planetary nebulae
Most planetary nebulae (PNe) show beautiful, axisymmetric morphologies despite their progenitor stars being essentially spherical. Angular momentum provided by a close binary companion is widely invoked as the main agent that would help eject an axisymmetric nebula, after a brief phase of engulfment of the secondary within the envelope of …