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Triple-star systems exhibit a phenomenon known as the Triple EvolutionDynamical Instability (TEDI), in which mass loss in evolving triples triggersshort-term dynamical instabilities, potentially leading to collisions of stars,exchanges, and ejections. Previous work has shown that the TEDI is an importantpathway to head-on stellar collisions in the Galaxy, significantly exceedingthe rate of collisions due to random encounters in globular clusters. Here, werevisit the TEDI evolutionary pathway using state-of-the-art populationsynthesis methods that self-consistently take into account stellar evolutionand binary interactions, as well as gravitational dynamics and perturbationsfrom passing stars in the field. We find Galactic TEDI-induced collision rateson the order of 1e-4/yr, consistent with previous studies which were based onmore simplified methods. The majority of TEDI-induced collisions involve mainsequence stars, potentially producing blue straggler stars. Collisions are alsopossible involving more evolved stars, potentially producing eccentricpost-common-envelope systems, and white dwarfs collisions leading to Type Iasupernovae (although the latter with a negligible contribution to the Galacticrate). In our simulations, the TEDI is not only triggered by adiabatic windmass loss, but also by Roche lobe overflow in the inner binary: when the donorstar becomes less massive than the accretor, the inner binary orbit widens,triggering triple dynamical instability. We find that collision rates areincreased by ~17% when fly-bys in the field are taken into account. In additionto collisions, we find that the TEDI produces ~1e-4/yr of unbound stars,although none with escape speeds in excess of 1e3 km/s.

Return of the TEDI: revisiting the Triple Evolution Dynamical Instability channel in triple stars