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The disruption of multiplanet systems through resonance with a binary orbit
1Department of Physics, American University of Beirut, PO Box 11-0236, Riad El-Solh, Beirut 1107 2020, Lebanon.
Nature
|August 28, 2015
Summary
Binary resonant driving can excite large planetary eccentricities and inclinations, or even disrupt systems. This generic mechanism, affecting exoplanetary systems in binary stars, does not require special conditions.
Area of Science:
- Astronomy
- Astrophysics
- Exoplanetary Science
Background:
- Most exoplanetary systems in binary stars are S-type, with planets orbiting one star in a wide binary system.
- Planetary eccentricities and inclinations can be significant, potentially driven by gravitational interactions with the binary companion.
- The Kozai-Lidov instability was previously invoked to explain large oscillations in single-planet systems.
Purpose of the Study:
- To investigate the impact of orbital precession on planetary systems within binary stars.
- To explore the phenomenon of resonant binary forcing and its consequences for exoplanet architectures.
- To determine if resonant interactions can occur between orbital precession in multiplanet systems and distant binary companions.
Main Methods:
- Simulations of exoplanetary systems in binary stars, considering multiplanet interactions and orbital precession.
- Analysis of how orbital precession can synchronize with the orbital motion of a distant binary companion.
- Modeling the effects of resonant binary forcing on planetary orbital dynamics.
Main Results:
- Orbital precession in multiplanet systems can become fast enough to resonate with a distant binary companion.
- Resonant binary forcing leads to dramatic outcomes, including large planetary eccentricities, mutual inclinations, and system disruption.
- Planetary migration can drive initially non-resonant systems into resonance.
Conclusions:
- Binary resonant driving is a generic mechanism that can significantly alter the architecture of multiplanet systems.
- This phenomenon may explain the observed occurrence rates of planets in wide binary systems.
- Resonant binary forcing can also influence planet formation processes, particularly in close binary systems.
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