Instability from high-order resonant chains in wide-separation massive planet systems

Abstract

Diversity in the properties of exoplanetary systems arises, in part, from dynamical evolution that occurs after planet formation. We use numerical integrations to explore the relative role of secular and resonant dynamics in the long-term evolution of model planetary systems, made up of three equal mass giant planets on initially eccentric orbits. The range of separations studied is dominated by secular processes, but intersects chains of high-order mean-motion resonances. Over time-scales of $10^8$ orbits, the secular evolution of the simulated systems is predominantly regular. High-order resonant chains, however, can be a significant source of angular momentum deficit (AMD), leading to instability. Using a time-series analysis based on a Hilbert transform, we associate instability with broad islands of chaotic evolution. Previous work has suggested that first-order resonances could modify the AMD of nominally secular systems and facilitate secular chaos. We find that higher-order resonances, when present in chains, can have similar impacts.

9 pages, 9 figures, Accepted to MNRAS

References in corpus (13)

• Dynamical Outcomes of Planet-Planet Scattering
• Hot Jupiters from Coplanar High-eccentricity Migration
• Chaotic diffusion in the Solar System
• AMD-stability and the classification of planetary systems
• Predicting the long-term stability of compact multiplanet systems
• On the Dynamical Stability of the Solar System
• A Machine Learns to Predict the Stability of Tightly Packed Planetary Systems
• The path to instability in compact multi-planetary systems
• Formation of Hot Jupiters through Secular Chaos and Dynamical Tides
• Instabilities in Multi-Planet Circumbinary Systems
• Fundamental limits from chaos on instability time predictions in compact planetary systems
• Born extra-eccentric: A broad spectrum of primordial configurations of the gas giants that match their present-day orbits
• Analysis of the dynamical evolution of the Quadrantid meteoroid stream