Chaos in multiplanetary extrasolar systems

Abstract

Here we present an initial look at the dynamics and stability of 178 multiplanetary systems which are already confirmed and listed in the NASA Exoplanet Archive. To distinguish between the chaotic and regular nature of a system, the value of the MEGNO indicator for each system was determined. Almost three-quarters of them could be labelled as long-term stable. Only 45 studied systems show chaotic behaviour. We consequently investigated the effects of the number of planets and their parameters on the system stability. A comparison of results obtained using the MEGNO indicator and machine-learning algorithm SPOCK suggests that the SPOCK could be used as an effective tool for reviewing the stability of multiplanetary systems. A similar study was already published by Laskar and Petit in 2017. We compared their analysis based on the AMD criterion with our results. The possible discrepancies are discussed.

8 pages, 5 figures; data available at http://vizier.cds.unistra.fr/viz-bin/VizieR?-source=J/MNRAS/518/2068

References in corpus (13)

• Exoplanet Orbital Eccentricities Derived From LAMOST-Kepler Analysis
• Six transiting planets and a chain of Laplace resonances in TOI-178
• AMD-stability and the classification of planetary systems
• Predicting the long-term stability of compact multiplanet systems
• HD45364, a pair of planets in a 3:2 mean motion resonance
• Dynamical Evolution of Multi-Resonant Systems: the Case of GJ876
• On the extrasolar multi-planet system around HD160691
• The Reversibility Error Method (REM): a new, dynamical fast indicator for planetary dynamics
• Chaos detection tools: application to a self-consistent triaxial model
• The Anglo-Australian Planet Search XXV: A Candidate Massive Saturn Analog Orbiting HD 30177
• Two Super-Earths in the 3:2 MMR around KOI-1599
• WASP-92, WASP-93 and WASP-118: Transit timing variations and long-term stability of the systems
• Planet-planet scattering in presence of a companion star