The document summarizes simulations showing that perturbations from the Milky Way can disrupt planetary systems in wide binary star systems (average separations over 1,000 AU) by driving variations in the binary orbit.
Specifically:
- Simulations found that 30-60% of planetary systems in wide binaries experience instabilities causing planetary ejections over 10 billion years due to low binary pericentre passages driven by Galactic tides.
- The eccentricity distribution of giant exoplanets in wide binaries is significantly higher than around single stars, consistent with additional scattering triggered by time-varying binary companions.
- Additional simulations reproduced the observed eccentricity distributions by assuming similar initial planetary systems that undergo scattering both in isolation and with a distant