On the Possibility of Additional Planets in the Γ Cephei Binary-planetary System

Results of the simulations of the dynamical stability of additional hypothetical planets in the γ Cephei binary-planetary system are presented. Using the reported orbital parameters of the existing bodies (Hatzes et al. 2003), simulations were carried out for different values of the mass, eccentricity, and inclination of an additional Jupiter-like plantet to test the stability of this object at a distance of 3 to 5 AU from the primary star. Simulations were also carried out for fictitious Saturnand Neptune-like planets. Results indicate that the system appears to be dynamically full and no stable orbits of any additional planets were found.