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Electromagnetic Chirps from Neutron Star-Black Hole Mergers

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arxiv 1704.07886 v1 pith:AB6SC34A submitted 2017-04-25 astro-ph.HE

Electromagnetic Chirps from Neutron Star-Black Hole Mergers

classification astro-ph.HE
keywords neutronelectromagneticholestarblackchirpscurvegamma-ray
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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. We propose to search for these electromagnetic chirps using matched filtering algorithms similar to those used in LIGO data analysis.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Dynamics and detectability of long-lived non-accretion phases for massive black hole binaries in cold, thermally regulating disks

    astro-ph.HE 2026-06 conditional novelty 7.0

    Self-consistently heated and cooled thin circumbinary disks still drive massive black hole binaries into long-lived non-accreting phases, producing X-ray-weak, optically variable sources that LSST and Roman could find.

  2. Dynamics and detectability of long-lived non-accretion phases for massive black hole binaries in cold, thermally regulating disks

    astro-ph.HE 2026-06 unverdicted novelty 6.0

    Self-consistent thermal regulation in circumbinary disks permits long-lived non-accretion phases that suppress binary feeding rates toward the Eddington limit while leaving optical/near-IR detectability intact.