• DOI:10.1093/mnras/stt765
• Corpus ID: 118643833

Dynamical analysis of the Gliese-876 Laplace resonance

@article{Mart2013DynamicalAO,
  title={Dynamical analysis of the Gliese-876 Laplace resonance},
  author={J. Gonz{\'a}lez Mart{\'i} and Cristian A. Giuppone and Cristi{\'a}n Beaug{\'e}},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={2013},
  volume={433},
  pages={928-934}
}

• J. Martí, C. Giuppone, C. Beaugé
• Published 28 May 2013
• Physics, Geology
• Monthly Notices of the Royal Astronomical Society

The number of multiple-planet systems known to be involved in mean motion conmensurabilities has increased significantly since the Kepler mission. Although most correspond to two-planet resonances, multiple resonances have also been found. The Laplace resonance is a particular case of a three-body resonance in which the period ratio between consecutive pairs is n1/n2 ∼ n2/n3 ∼ 2/1. It is not clear how this triple resonance acts to stabilize (or not) the system. 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