2016ApJ...820...55X -
Astrophys. J., 820, 55 (2016/March-3)
Difficulty in the formation of counter-orbiting hot jupiters from near-coplanar hierarchical triple systems: a sub-stellar perturber.
XUE Y. and SUTO Y.
Abstract (from CDS):
Among 100 transiting planets with a measured projected spin-orbit angle λ, several systems are suggested to be counter-orbiting. While these cases may be due to the projection effect, the mechanism that produces a counter-orbiting planet has not been established. A promising scenario for counter-orbiting planets is the extreme eccentricity evolution in near-coplanar hierarchical triple systems with eccentric inner and outer orbits. We examine this scenario in detail by performing a series of systematic numerical simulations, and consider the possibility of forming hot Jupiters (HJs), especially a counter-orbiting one under this mechanism with a distant sub-stellar perturber. We incorporate quadrupole and octupole secular gravitational interaction between the two orbits, and also short-range forces (correction for general relativity, star and inner planetary tide, and rotational distortion) simultaneously. We find that most systems are tidally disrupted and that a small fraction of the surviving planets turn out to be prograde. The formation of counter-orbiting HJs in this scenario is possible only in a very restricted parameter region, and thus is very unlikely in practice.
Abstract Copyright:
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Journal keyword(s):
planet-star interactions - planets and satellites: dynamical evolution and stability - planets and satellites: formation
Simbad objects:
7
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