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The goal of this paper it to prove existence theorems for one parameterfamilies (branches) of ejection-collision orbits in the planar circularrestricted three body problem (CRTBP), and to study some of their bifurcations.The orbits considered are ejected from one primary body and collide with theother (as opposed to more local ejections-collision orbits which involve only asingle body). We consider branches which are (i) parameterized by the Jacobiintegral (energy like quantity conserved by the CRTBP) and (ii) parameterizedby the two body mass ratio when energy is fixed. The method of proof isconstructive and computer assisted, hence can be applied in non perturbativesettings and (potentially) to other conservative systems of differentialequations. The main requirement is that the system should admit a change ofcoordinates which regularizes the singularities (collisions). In the planarCRTBP the necessary regularization is provided by the classical Levi-Civitatransformation.

Branches and bifurcations of ejection-collision orbits in the planar circular restricted three body problem