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Asteroid flux towards circumprimary habitable zones in binary star systems: II. Dynamics | | D. Bancelin
; E. Pilat-Lohinger
; A. Bazso
; | | Date: |
30 Dec 2015 | | Abstract: | Secular and mean motion resonances (hearafter MMR) are effective
perturbations to shape planetary systems. In binary star systems, they play a
key role during the early and late phases of planetary formation as well as the
dynamical stability of a planetary system. In this study, we aim to correlate
the presence of orbital resonances with the rate of icy asteroids crossing the
habitable zone (hearafter HZ), from a circumprimary disk of planetesimals in
various binary star systems. We modelled a belt of small bodies in the inner
and outer regions, respectively below and beyond the orbit of a gas giant
planet. The planetesimals are equally placed around a primary G-type star and
move under the gravitational influence of the two stars and the gas giant. We
numerically integrated the system for 50 Myr considering various parameters for
the secondary star. Its stellar type varies from a M- to F-type; its semimajor
axis is either 50 au or 100 au and its eccentricity is either 0.1 or 0.3. Our
simulations highlight that a disk of planetesimals will suffer from
perturbations due to a perturbed gas giant, mean motion and secular
perturbations. We show that a secular perturbation -- which location and width
vary according to the secondary star’s characteristics -- can exist in the
region of the icy asteroid belt region and overlap with MMRs which will have an
impact on the dynamical lifetime of the disk. In addition, we point out that in
any case, the 2:1 MMR, the 5:3 MMR and the secular perturbed area are powerful
perturbations for the transport of icy material into the HZ. | | Source: | arXiv, 1512.8875 | | Services: | Forum | Review | PDF | Favorites | |
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