On the evolution of the resonant planetary system HD 128311
Zsolt Sandor & Wilhelm Kley
Astronomy & Astrophysics (2006), 447, L31
Abstract:
A significant number of the known multiple exoplanetary systems are
containing a pair of giant planets engaged in a low order mean motion
resonance. Such a resonant condition protects the dynamics of these planets
resulting in very stable orbits. According to recent studies the capture
into a resonance is the result of a planetary migration process induced
by the interaction of the planets with a protoplanetary disk.
If the migration is slow enough (adiabatic) next to a mean motion
resonance, the two planets will also be in apsidal corotation.
The recently refined orbital parameters of the system HD 128311
suggest that the two giant planets are in a 2:1 mean motion
resonance, however without exhibiting apsidal corotation. Thus the evolution of
this system can not be described by an adiabatic migration process alone.
We present possible evolution scenarios of this system combining migration
processes and sudden perturbations.
We model migration scenarios through numerical
integration of the gravitational N-body problem with additional non-conservative forces.
Planet-planet scattering has been investigated by N-body simulations.
We show that the present dynamical state of the system HD 128311 may be
explained by such evolutionary processes.
Accepted Version, March 2006
pdf-file (ca. 0.8 MB)
Link bei Astronomy & Astrophysics:
A&A, 447 L31