Astronomy and Astrophysics – Astronomy
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008dda....39.1203s&link_type=abstract
American Astronomical Society, DDA meeting #39, #12.03
Astronomy and Astrophysics
Astronomy
Scientific paper
The discovery of planets in tight binary systems has raised new challenges to theories of stellar and planetary formation. The most likely formation scenario for such systems involves a dynamical capture mechanism. After such a capture, high relative inclinations are likely and may lead to Kozai oscillations. We numerically investigate the fate of planets which may have been orbiting the primary before acquiring a stellar companion by performing dynamical integrations for representative four-body systems composed of a tight binary with separation 10 AU, a hot Jupiter, and a second planet on a wider orbit, both orbiting a single star. We find that such a system can remain stable at low relative inclinations (< 40 deg) including a potentially habitable planet.
In systems with high relative inclinations, Kozai oscillations in the outer planetary orbit always lead to instabilities, except for a stability zone within which mutual gravitational perturbations among the planets can suppress the Kozai mechanism. During Kozai oscillations in the outer orbit, a differential nodal precession among planets is ensued breaking their coplanarity and mutual inclinations can grow considerably on secular time-scales. This has the potential to induce Kozai oscillations in the inner orbit if the time-scales associated with these oscillations is comparable to general relativistic (GR) precession time-scales.
Propagating perturbations from the stellar companion through a planetary system in this manner can have dramatic effects on the dynamical evolution of planetary systems and can offer a reasonable explanation of eccentricity trends among planets observed in binary systems.
Rasio Frederic A.
Saleh Lamya A.
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