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Distribution and Dispersion

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Bringing the Visible Universe into Focus with Robo-AO
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Planet-planet scattering in the upsilon Andromedae system.

Eric B Ford1, Verene Lystad, Frederic A Rasio

  • 1Department of Astronomy, University of California, Berkeley, California 94720, USA.

Nature
|April 15, 2005
PubMed
Summary

Giant exoplanets can develop highly eccentric orbits due to chaotic interactions with other planets. The upsilon Andromedae system shows evidence of a lost planet causing these orbital changes, with one planet returning to a circular orbit periodically.

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Area of Science:

  • Astronomy and Astrophysics
  • Exoplanetary Science
  • Planetary Dynamics

Background:

  • Doppler spectroscopy has identified numerous exoplanets, with many exhibiting highly eccentric orbits.
  • Such eccentricities contrast with the nearly circular orbits of planets in our Solar System, challenging standard planet formation theories.
  • Existing models for generating high eccentricities lack substantial observational support.

Purpose of the Study:

  • To investigate the dynamical history of the upsilon Andromedae planetary system.
  • To determine the cause of the observed eccentric orbits of its giant planets.
  • To provide observational evidence for theories explaining exoplanet orbital evolution.

Main Methods:

  • Analysis of the current orbital configuration of the three giant planets in the upsilon Andromedae system.
  • Dynamical modeling to simulate the evolution of planetary orbits.
  • Investigating the effects of close encounters and gravitational perturbations.

Main Results:

  • The current eccentric orbits of upsilon Andromedae's giant planets are likely the result of a past close dynamical interaction with an unobserved planet.
  • Chaotic evolution perturbed the outer planet (upsilon And d) into a high-eccentricity orbit.
  • The middle planet (upsilon And c) experiences slow, periodic variations in its eccentricity, returning to a near-circular state every 6,700 years.

Conclusions:

  • The upsilon Andromedae system provides strong evidence for chaotic dynamical interactions shaping exoplanetary systems.
  • The presence and subsequent loss of a planet can explain the observed orbital eccentricities.
  • This study highlights the importance of gravitational interactions in planetary system evolution and offers a potential explanation for observed exoplanet architectures.