Density snapshots in the orbital plane for different systems. Panel a: initial state of the primary RG star before a companion is added. Here, the time indicates that of the relaxation run. For the binary simulations in (panels b–f), the mass of the companion is given on the bottom left side of each panel, the time after adding the companion at the bottom right and the equation of state at the top left. The positions of the cores of the RG primary star and the companion are marked by an × and + respectively. Each frame is centered on the center of mass of the binary system.