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Nearly every star known to host planets will become a white dwarf, and nearly100 planet-hosts are now known to be accompanied by binary stellar companions.Here, we determine how a binary companion triggers instability in otherwiseunconditionally stable single-star two-planet systems during the giant branchand white dwarf phases of the planet host. We perform about 700 full-lifetime(14 Gyr) simulations with A0 and F0 primary stars and secondary K2 companions,and identify the critical binary distance within which instability is triggeredat any point during stellar evolution. We estimate this distance to be aboutseven times the outer planet separation, for circular binaries. Our resultshelp characterize the fates of planetary systems, and in particular which onesmight yield architectures that are conducive to generating observable heavymetal pollution in white dwarf atmospheres.

Binary star influence on post-main-sequence multi-planet stability