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Planet scattering around binaries: ejections, not collisions
Smullen, Rachel A.; Kratter, Kaitlin M.; Shannon, Andrew
AA(Steward Observatory, University of Arizona, Tucson, AZ 85721, USA ), AB(Steward Observatory, University of Arizona, Tucson, AZ 85721, USA), AC(Institute of Astronomy, University of Cambridge, Cambridge CB3 0HA, UK)
Monthly Notices of the Royal Astronomical Society, Volume 461, Issue 2, p.1288-1301 (MNRAS Homepage)
Publication Date:
Astronomy Keywords:
planets and satellites: dynamical evolution and stability, planet-star interactions, binaries: general, planetary systems
Abstract Copyright:
2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
Bibliographic Code:


Transiting circumbinary planets discovered by Kepler provide unique insight into binary star and planet formation. Several features of this new found population, for example the apparent pile-up of planets near the innermost stable orbit, may distinguish between formation theories. In this work, we determine how planet-planet scattering shapes planetary systems around binaries as compared to single stars. In particular, we look for signatures that arise due to differences in dynamical evolution in binary systems. We carry out a parameter study of N-body scattering simulations for four distinct planet populations around both binary and single stars. While binarity has little influence on the final system multiplicity or orbital distribution, the presence of a binary dramatically affects the means by which planets are lost from the system. Most circumbinary planets are lost due to ejections rather than planet-planet or planet-star collisions. The most massive planet in the system tends to control the evolution. Systems similar to the only observed multiplanet circumbinary system, Kepler-47, can arise from much more tightly packed, unstable systems. Only extreme initial conditions introduce differences in the final planet populations. Thus, we suggest that any intrinsic differences in the populations are imprinted by formation.
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