In a binary star system, the companion star's gravity moves the giant planets' secular resonances farther out and suppresses them, leaving a larger region where terrestrial planets can form.
Main-sequence systems: orbital stability in stellar binaries
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abstract
The majority of star formation results in binaries or higher multiple systems, and planets in such systems are constrained to a limited range of orbital parameters in order to remain stable against perturbations from stellar companions. Many planets have been discovered in such multiple systems (such as stellar binaries), and understanding their stability is important in exoplanet searches and characterization. In this chapter, we focus on the orbital stability of planets in stellar binaries. We review key results based on semi-analytical secular (long term) methods, as well as results based on N-body simulations and more recent Machine Learning methods. We discuss planets orbiting one of the stellar binary components (S-type) and those orbiting both stars (P-type) separately.
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Secular Resonances in Planet-Hosting Binary Stars. I. General Theory
In a binary star system, the companion star's gravity moves the giant planets' secular resonances farther out and suppresses them, leaving a larger region where terrestrial planets can form.