Compact Object Mergers Driven by Gas Fallback

Physical Review Letters
Hiromichi TagawaBence Kocsis

Abstract

Recently, several gravitational wave detections have shown evidence for compact object mergers. However, the astrophysical origin of merging binaries is not well understood. Stellar binaries are typically at much larger separations than what is needed for the binaries to merge due to gravitational wave emission, which leads to the so-called final AU problem. In this Letter we propose a new channel for mergers of compact object binaries which solves the final AU problem. We examine the binary evolution following gas expansion due to a weak failed supernova explosion, neutrino mass loss, core disturbance, or envelope instability. In such situations the binary is possibly hardened by ambient gas. We investigate the evolution of the binary system after a shock has propagated by performing smoothed particle hydrodynamics simulations. We find that significant binary hardening occurs when the gas mass bound to the binary exceeds that of the compact objects. This mechanism represents a new possibility for the pathway to mergers for gravitational wave events.

References

Feb 27, 2016·Physical Review Letters·B P AbbottUNKNOWN LIGO Scientific Collaboration and Virgo Collaboration
Jul 2, 2016·Physical Review Letters·B P AbbottUNKNOWN LIGO Scientific Collaboration and Virgo Collaboration
Jun 18, 2017·Physical Review Letters·B P AbbottUNKNOWN LIGO Scientific and Virgo Collaboration
Oct 21, 2017·Physical Review Letters·B P AbbottUNKNOWN LIGO Scientific Collaboration and Virgo Collaboration

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Citations

Nov 6, 2018·Physical Review Letters·Giacomo Fragione, Bence Kocsis

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