Dynamical stability of the kepler-223 resonant chain

J. G. MARTÍ, C. BEAUGÉ AND C. A. GIUPPONE

Aguas de Lindoia

Congreso; Coloquio Brasilero de Dinámica Orbital; 2014

INPE

The Kepler-223 system is a newly confirmed, four-planet exo-system orbiting a sun-like star. The masses of the planets are in the range 2.5 < m p /M ⊕ < 8.6, and of particular interest is the resonant configuration that the planets exhibit. The orbital periods of the planets are such that the two inner, and the two outer bodies are extremely close to a 4:3 Mean Motion Resonance, while the second and third planets appear to be trapped into a 3:2 MMR. This resonant chain is the first confirmed case of a planetary system with four planets involved in a multiple resonant configuration. We present here a series of numerical integrations in order to find the dynamical configuration that best fits the resonant chain of this system. We also test, by the integration of initial conditions with a hypothetical fifth planet, the strenght and subsequent stability of such a resonant structure.