Instabilities in Multi-Planet Circumbinary Systems

Abstract

The majority of the discovered transiting circumbinary planets are located very near the innermost stable orbits permitted, raising questions about the origins of planets in such perturbed environments. Most favored formation scenarios invoke formation at larger distances and subsequent migration to their current locations. Disk-driven planet migration in multi-planet systems is likely to trap planets in mean motion resonances and drive planets inward into regions of larger dynamical perturbations from the binary. We demonstrate how planet-planet resonances can interact with the binary through secular forcing and mean-motion resonances, driving chaos in the system. We show how this chaos will shape the architecture of circumbinary systems, with specific applications to Kepler 47 and the Pluto-Charon system, limiting maximum possible stable eccentricities and indicating what resonances are likely to exist. We are also able to constrain the minimum migration rates of resonant circumbinary planets.

Accepted for publication in MNRAS

References in corpus (11)

• A resonant chain of four transiting, sub-Neptune planets
• The Migration of Gap-Opening Planets is not Locked to Viscous Disk Evolution
• Constraints on resonant-trapping for two planets embedded in a protoplanetary disc
• Planets Transiting Non-Eclipsing Binaries
• Relative velocities among accreting planetesimals in binary systems: the circumbinary case
• Discovery of a Third Transiting Planet in the Kepler-47 Circumbinary System
• On the migration of protoplanets embedded in circumbinary disks
• Uncovering Circumbinary Planetary Architectural Properties from Selection Biases
• On the Origin of Pluto's Small Satellites by Resonant Transport
• On the Origin of Pluto's Minor Moons, Nix and Hydra
• The Fate of Debris in the Pluto-Charon System