# High Velocity Runaway Binaries from Supernovae in Triple Systems

## TL;DR

This paper investigates how supernova explosions in triple star systems can produce high velocity runaway binaries, potentially exceeding 350 km/s, which may contribute to hypervelocity star observations and escape from the galaxy.

## Contribution

It introduces a new mechanism for generating high velocity runaway binaries through supernovae in hierarchical triples, expanding understanding of hypervelocity star origins.

## Key findings

- Supernova explosions in triple systems can produce binaries with velocities over 350 km/s.
- Such high velocity binaries can potentially escape the galaxy.
- The mechanism provides a plausible explanation for some hypervelocity star candidates.

## Abstract

Recent studies on hypervelocity stars (HVSs) have generated a need to understand the high velocity limits of binary systems. If runaway binary systems with high movement speeds well in excess of 200km/s were to exist, it would have implications on how HVS candidates are selected, and our current understanding of how they form needs to be reinforced. In this paper, we explore the possibility that such high velocity runaway binaries (HVRBs) can be engendered by supernova explosions of the tertiary in close hierarchical triple systems. We find that such explosions can lead to significant remnant binary velocities, and demonstrate via constraining the velocity distribution of such HVRBs that this mechanism can lead to binaries with centre of mass velocities of 350 km/s or more, relative to the original centre of mass of the progenitor triple system. This translates into potential observations of binaries with velocities high enough to escape the Galaxy, once the Galactic rotational velocity and objects of Large Magellanic Cloud origins are considered.