Apsidal behavior among planetary orbits: Testing the planet-planet scattering model

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Planets in extrasolar systems tend to interact such that their orbits lie near a boundary between apsidal libration and circulation, a "separatrix," with one eccentricity periodically reaching near zero. One explanation, applied to the v And system, assumed three original planets on circular orbits. One is ejected, leaving the other two with near-separatrix behavior. We test that model by integrating hundreds of hypothetical, unstable planetary systems that eject a planet. We find that the probability that the remaining planets exhibit near-separatrix motion is small (<5% compared with nearly 50% of observed systems). Moreover, while observed librating systems are evenly divided between aligned and antialigned pericenter longitudes, the scattering model strongly favors alignment. Alternative scattering theories are proposed, which may provide a more satisfactory fit with observed systems.

Original languageEnglish (US)
JournalAstrophysical Journal
Volume659
Issue number1 II
DOIs
StatePublished - Apr 10 2007

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planetary orbits
planets
planet
scattering
planetary systems
libration
circular orbits
eccentricity
model test
alignment
orbits

Keywords

  • Methods: n-body simulations
  • Planetary systems
  • Planets and satellites: formation

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Apsidal behavior among planetary orbits : Testing the planet-planet scattering model. / Barnes, Rory; Greenberg, Richard J.

In: Astrophysical Journal, Vol. 659, No. 1 II, 10.04.2007.

Research output: Contribution to journalArticle

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