Exchange orbits: a possible application to extrasolar planetary systems?

Details Exchange orbits: a possible application to extrasolar planetary systems? Exchange orbits: a possible application to extrasolar planetary systems?

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011mnras.410..455f&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 410, Issue 1, pp. 455-460.

Astronomy and Astrophysics

Astronomy

1

Methods: Numerical, Celestial Mechanics, Planets And Satellites: Dynamical Evolution And Stability

Scientific paper

Among the 48 known multiplanetary systems, some are in mean-motion resonances (in most cases in the 2:1 mean-motion resonance). Although until now no extrasolar planetary systems have been found in a 1:1 mean-motion resonance, many studies are dealing with this configuration. Besides the well-known motion of the Trojan asteroids, further possibilities exist for stable configurations of planets or satellites in a 1:1 resonance. For one thing, we can find so-called exchange orbits in our Solar system (Janus and Epimetheus), where both Saturnian moons exchange the values of their semi-major axes (exchange-a configuration) when approaching each other. In addition, we can also find similar behaviour for two planets on orbits with the same semi-major axis, but with different eccentricities; here an exchange of eccentricities takes place (exchange-e configuration). In this work we focused on the second possibility and performed a parameter study by varying the initial conditions (mass and eccentricity) of two planets on exchange-e orbits. By means of an extensive numerical study, we can find a wide variety of initial conditions leading to long-term stable orbits.

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