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2013MNRAS.433..928M - Mon. Not. R. Astron. Soc., 433, 928-934 (2013/August-1)
Dynamical analysis of the Gliese-876 Laplace resonance.
MARTI J.G., GIUPPONE C.A. and BEAUGE C.
Abstract (from CDS):
The most reliable extrasolar system located in a Laplace resonance is GJ 876, because it has two independent confirmations. However, best-fit parameters were obtained without previous knowledge of resonance structure, and not all possible stable solutions for the system have been explored.
In the present work we explore the various configurations allowed by the Laplace resonance in the GJ 876 system by varying the planetary parameters of the third outer planet. We find that in this case the Laplace resonance is a stabilization mechanism in itself, defined by a tiny island of regular motion surrounded by (unstable) highly chaotic orbits. Low-eccentricity orbits and mutual inclinations from -20° to 20° are compatible with observations. A definite range of mass ratio must be assumed to maintain orbital stability. Finally, we provide constraints on the argument of pericentres and mean anomalies to ensure stability for this kind of system.
Abstract Copyright: © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2013)
Journal keyword(s): techniques: radial velocities - celestial mechanics - planets and satellites: formation
Simbad objects: 10
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