Orbital Stability of Circumstellar Earthlike planets in Binary Systems
Abstract
Exoplanet searches have uncovered ~100 worlds orbiting one star within a binary system, where significantly more may exist due to observational biases. Nbody simulations can identify the stellar binary parameters that allow for stable trajectories and assist in the observations of planetary candidates in stellar binaries. The study by Holman & Wiegert (1999, AJ 117, 621) was limited in scope, where a planet was represented as a massless, coplanar particle. We performed ~700 million simulations that increase the accuracy of the previous result, include massive particles, and allow for a substantial mutual inclination with the binary orbital plane. Using the current population statistics for binary stars, we determined that planets with a semimajor axis less than ~8% of the binary semimajor axis will likely be stable. This estimate decreases in the LidovKozai regime of highly inclined orbits and increases for retrograde orbits to 4% and 10% of the binary semimajor axis, respectively. Our simulation results are also available on GitHub or Zenodo for others to use.
 Publication:

AAS/Division of Dynamical Astronomy Meeting
 Pub Date:
 August 2020
 Bibcode:
 2020DDA....5130004Q