Presentation #116.126 in the session Stellar/Compact Objects.
A large fraction of massive stars are not just in binaries but in higher order systems and the presence of a tertiary can significantly modify the system evolution. In particular, it can lead to increased numbers of compact object binaries and accelerate their mergers with important implications for gravitational wave observations. Using Gaia, we constrain the number of supernovae that produce unbound triples after a Galactic supernova. We do this by searching supernova remnants for stars with consistent Gaia parallaxes and paths intersecting near the center of the supernova remnant at a time consistent with the age of the remnant. The numbers or absence of such systems will significantly constrain the role of higher order systems in massive star evolution and compact object formation.