Resonant Shattering of Neutron Star Crusts

Abstract

The resonant excitation of neutron star (NS) modes by tides is investigated as a source of short gamma-ray burst (sGRB) precursors. We find that the driving of a crust-core interface mode can lead to shattering of the NS crust, liberating ~10^46-10^47 erg of energy seconds before the merger of a NS-NS or NS-black hole binary. Such properties are consistent with Swift/BAT detections of sGRB precursors, and we use the timing of the observed precursors to place weak constraints on the crust equation of state. We describe how a larger sample of precursor detections could be used alongside coincident gravitational wave detections of the inspiral by Advanced LIGO class detectors to probe the NS structure. These two types of observations nicely complement one another, since the former constrains the equation of state and structure near the crust-core boundary, while the latter is more sensitive to the core equation of state.

5 pages, 2 figures. Accepted to PRL

References in corpus (6)

• Physics of Strongly Magnetized Neutron Stars
• The Breaking Strain of Neutron Star Crust and Gravitational Waves
• Post-1-Newtonian tidal effects in the gravitational waveform from binary inspirals
• Gravitational waves from spinning black hole-neutron star binaries: dependence on black hole spins and on neutron star equations of state
• Constraints on Neutron Star Crusts From Oscillations in Giant Flares
• Black hole-neutron star mergers for 10 solar mass black holes

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