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2017

Electromagnetic Chirps from Neutron Star-Black Hole Mergers

Schnittman, Jeremy D., Canton, Tito Dal, Camp, Jordan et al.

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We calculate the electromagnetic signal of a gamma-ray flare coming from the surface of a neutron star shortly before merger with a black hole companion.

Using a new version of the Monte Carlo radiation transport code Pandurata that incorporates dynamic spacetimes, we integrate photon geodesics from the neutron star surface until they reach a distant observer or are captured by the black hole.
The gamma-ray light curve is modulated by a number of relativistic effects, including Doppler beaming and gravitational lensing.
Because the photons originate from the inspiraling neutron star, the light curve closely resembles the corresponding gravitational waveform: a chirp signal characterized by a steadily increasing frequency and amplitude.

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Then

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