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Long-term orbital stability of exosolar planetary systems with highly eccentric orbits

Published online by Cambridge University Press:  27 October 2016

Kyriaki I. Antoniadou  and
George Voyatzis
Kyriaki I. Antoniadou*
Affiliation:
Sect. of Astrophysics, Astronomy and Mechanics, Dept. of Physics, Aristotle University of Thessaloniki, 54124, Greece
George Voyatzis*
Affiliation:
Sect. of Astrophysics, Astronomy and Mechanics, Dept. of Physics, Aristotle University of Thessaloniki, 54124, Greece
*
1email: [email protected]
2email: [email protected]
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Abstract

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Nowadays, many extrasolar planetary systems possessing at least one planet on a highly eccentric orbit have been discovered. In this work, we study the possible long-term stability of such systems. We consider the general three body problem as our model. Highly eccentric orbits are out of the Hill stability regions. However, mean motion resonances can provide phase protection and orbits with long-term stability exist. We construct maps of dynamical stability based on the computation of chaotic indicators and we figure out regions in phase space, where the long-term stability is guaranteed. We focus on regions where at least one planet is highly eccentric and attempt to associate them with the existence of stable periodic orbits. The values of the orbital elements, which are derived from observational data, are often given with very large deviations. Generally, phase space regions of high eccentricities are narrow and thus, our dynamical analysis may restrict considerably the valid domain of the system's location.

Keywords

dynamical stabilityperiodic orbitsplanetary systems
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , General Assembly A29A: Astronomy in Focus , August 2015 , pp. 38 - 39
Copyright
Copyright © International Astronomical Union 2016 

References

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