Chaos in multiplanetary extrasolar systems

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