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Electromagnetic precursors to gravitational wave events: Numerical simulations of flaring in pre-merger binary neutron star magnetospheres

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arxiv 2001.06037 v3 pith:TEZOYQKU submitted 2020-01-16 astro-ph.HE gr-qc

Elias R. Most , Alexander A. Philippov This is my paper · ORCID
classification astro-ph.HEgr-qc
keywords emissionneutroneventsgravitationalmagnetospheresstarsbinarydiscuss
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The detection of gravitational waves from neutron star merger events has opened up a new field of multi-messenger astronomy linking gravitational waves events to short-gamma ray bursts and kilonova afterglows. A further - yet to be discovered - electromagnetic counterpart is precursor emission produced by the non-trivial interaction of the magnetospheres of the two neutron stars prior to merger. By performing special-relativistic force-free simulations of orbiting neutron stars we discuss the effect of different magnetic field orientations and show how the emission can be significantly enhanced by differential motion present in the binary, either due to stellar spins or misaligned stellar magnetospheres. We find that the built-up of twist in the magnetic flux tube connecting the two stars can lead to the repeated emission of powerful flares for a variety of orbital configurations. We also discuss potential coherent radio emission mechanisms in the flaring process.

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Cited by 5 Pith papers

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