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Area of Science:

  • Astrophysics
  • Gravitational Wave Astronomy
  • Black Hole Physics

Background:

  • Hierarchical triple systems, comprising an inner binary black hole (BBH) and an outer tertiary, are crucial for understanding compact object evolution.
  • Gravitational wave (GW) emission and orbital dynamics in these systems are complex and influenced by merger events.

Purpose of the Study:

  • To investigate the potential for tidal disruption events (TDEs) following a BBH merger within a hierarchical triple system.
  • To explore how GW observations, particularly with future missions like LISA, can identify such systems and prescreen for TDEs.

Main Methods:

  • Simulating GW emission and orbital evolution of hierarchical triple systems.
  • Analyzing the impact of BBH merger kick velocities on the tertiary companion.
  • Assessing the detectability of tertiary parameters for a large sample of BBHs with LISA.

Main Results:

  • BBH mergers can lead to tidal disruption of the tertiary companion, depending on the merger's kick velocity.
  • LISA can examine basic parameters of over 10^3 BBHs, enabling efficient prescreening for TDEs.
  • TDE probability is significantly higher in triple systems with aligned orbital and spin angular momenta.

Conclusions:

  • Hierarchical triple systems offer a unique channel for observing TDEs following BBH mergers.
  • Future GW observatories like LISA will be instrumental in identifying these systems and facilitating TDE searches.
  • System configuration, particularly orbital and spin alignment, plays a critical role in the likelihood of TDEs.