Parametric study of polar congurations around binaries

CRISTIAN GIUPPONE; NICOLÁS CUELLO

INPE - São José dos Campos, SP, Brasil

Congreso; XIX Colóquio Brasileiro de Dinâmica Orbital; 2018

INSTITUTO NACIONAL DE PESQUISAS ESPACIAIS

Dynamical studies suggest that most of the circumbinary discs (CBDs) should be coplanar. However, under certain initial conditions, the CBD can evolve toward polar orientation. Here we extend the parametric study of polar configurations around detached close-in binaries through $N$-body simulations. For polar configurations around binaries with mass ratios $q$ below $0.7$, the nominal location of the mean motion resonance (MMR) $1~:~4$ predicts the limit of stability for $e_B > 0.1$. Alternatively, for $e__B < 0.1$ or $q sim 1$, the nominal location of the MMR $1~:~3$ is the closest stable region. The presence of a giant planet increases the region of forbidden polar configurations around low mass ratio binaries with eccentricities $e_Bsim0.4$ with respect to rocky earth-like planets. For equal mass stars, the eccentricity excitation $Delta e$ of polar orbits smoothly increases with decreasing distance to the binary. For $q