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Astronomy
intermediate

Chaotic variations in the eccentricity of the planet orbiting 16 Cygni B

Matthew Holman et al. (1997)

Published
Mar 1, 1997
Journal
Nature · Vol. 386 · No. 6622
DOI
10.1038/386254a0

At a GlanceAI

Shows Lidov–Kozai-type chaos can drive large, long-term eccentricity swings for the 16 Cyg B planet in a wide binary.

SummaryAI

The work argues that the unusually high eccentricity of the planet around 16 Cygni B can arise naturally from secular perturbations by the distant stellar companion, in the Lidov–Kozai resonance regime. It highlights that the planet’s eccentricity need not be static: it can undergo chaotic, large-amplitude variations over long timescales rather than simple periodic cycles. This provided an early, influential link between wide-binary architecture and eccentric exoplanet orbits, motivating later studies of Kozai cycles (and chaotic Kozai dynamics) in planet formation and migration scenarios.

Method SnapshotAI

Secular dynamical analysis of a hierarchical triple (planet–host star–distant companion) emphasizing Lidov–Kozai-driven evolution and chaos.

BackgroundAI

Celestial mechanics of hierarchical three-body systems, secular perturbation theory, and Lidov–Kozai resonance basics.