High Velocity Runaway Binaries from Supernovae in Triple Systems
arXiv:1905.12653 · doi:10.1093/mnras/stz1525
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.
5 pages, 2 figures
References in corpus (6)
- Constraining the Maximum Mass of Neutron Stars From Multi-Messenger Observations of GW170817
- Maximum speed of hypervelocity stars ejected from binaries
- Runaway and hypervelocity stars in the Galactic halo: Binary rejuvenation and triple disruption
- Secular dynamics in hierarchical three-body systems with mass loss and mass transfer
- Lessons from the curious case of the `fastest' star in Gaia DR2
- On the stability and collisions in triple stellar systems