Double neutron star mergers from hierarchical triple-star systems

Understand

The isolated binary evolution model for merging neutron stars (NSs) involves processes such as mass transfer, common-envelope evolution, and natal kicks, all of which are poorly understood.

• Also, the predicted NS-NS merger rates are typically lower than the rates inferred from the LIGO GW170817 event.
• Here, we investigate merger rates of NS and black hole (BH)-NS binaries in hierarchical triple-star systems.
• In such systems, the tertiary can induce Lidov-Kozai (LK) oscillations in the inner binary, accelerating its coalescence, and potentially enhancing compact object merger rates.