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 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.
- Received 29 September 2011
DOI:https://doi.org/10.1103/PhysRevLett.108.011102
© 2012 American Physical Society
Synopsis
Neutron Stars Shattered by Perfect Pitch
Published 5 January 2012
A crust-busting vibration of a neutron star—induced by a merger with another dense object—may explain pre-emptive flashes for some gamma-ray bursts.
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