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Long-term stability and dynamical spacing of compact planetary systems

Published online by Cambridge University Press:  16 October 2024

Antoine C. Petit Open the ORCID record for Antoine C. Petit [Opens in a new window]
Antoine C. Petit*
Affiliation:
Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Laboratoire Lagrange, France
*
email: [email protected]
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Abstract

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Exoplanet detection surveys revealed the existence of numerous multi-planetary systems packed close to their stability limit. In this proceeding, we review the mechanism driving the instability of compact systems, originally published in (Petit et al. 2020). Compact systems dynamics are dominated by the interactions between resonances involving triplets of planets. The complex network of three-planet mean motion resonances drives a slow chaotic semi-major axes diffusion, leading to a fast and destructive scattering phase. This model reproduces quantitatively the instability timescale found numerically. We can observe signpost of this process on exoplanet systems architecture. The critical spacing ensuring stability scales as the planet-to star mass ratio to the power 1/4. It explains why the Hill radius is not an adapted measure of dynamical compactness of exoplanet systems, particularly for terrestrial planets. We also provide some insight on the theoretical tools developped in the original work and how they can be of interest in other problems.

Keywords

Planetary systemsPlanetary system stabilityExoplanet systems architectureCelestial Mechanics
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 18 , Symposium S382: Complex Planetary Systems II: Latest Methods for an Interdisciplinary Approach , December 2022 , pp. 20 - 29
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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