A dynamical origin for planets in triple star systems
  Recent radial velocity and transit data discovered $\sim 100$ planets in
binary or triple stellar systems out of the entire population of a few thousand
known planets. Stellar companions are expected to strongly influence both the
formation and the dynamical evolution of planets in multiple star systems.
Here, we explore the possibility that planets in triples are formed as a
consequence of the dynamical interactions of binaries in star clusters. Our
simulations show that the probability of forming a planet-hosting triple as a
consequence of a single binary-binary scattering is in the range $0.5-3\%$,
when one of the binaries hosts a planet. Along with other formation scenarios,
binary-binary encounters are a viable way of creating planet-hosting triple
systems. The recently launched TESS satellite is expected to find a larger
sample of planets in triple systems, and to shed light on their origin.
