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Line-broadening in gravitational radiation from gamma-ray burst-supernovae

Maurice H. P. M. van Putten·Hyun Kyu Lee·Chul H. Lee·Hongsu Kim
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Abstract

Core-collapse in massive stars is believed to produce a rapidly spinning black hole surrounded by a compact disk or torus. This forms an energetic MeV-nucleus inside a remnant He-core, powered by black hole-spin energy. The output produces a GRB-supernova, while most of the energy released is in gravitational radiation. The intrinsic gravitational-wave spectrum is determined by multipole mass-moments in the torus. Quadrupole gravitational radiation is radiated at about twice the Keplerian frequency of the torus, which is non-axisymmetric when sufficiently slender, representing a ``{\em black hole-blob}" binary system or a "{\em blob-blob}" binary bound to the central black hole. We here discuss line-broadening in the observed spectrum due to Lense-Thirring precession, which modulates the orientation of the torus to the line-of-sight. This spectral feature is long-lived, due to weak damping of precessional motion. These events are believed to occur perhaps once per year within a distance of 100Mpc, which provides a candidate source for Advanced LIGO.

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Maurice H. P. M. van Putten, Hyun Kyu Lee, Chul H. Lee, Hongsu Kim. 2004-01-31. Line-broadening in gravitational radiation from gamma-ray burst-supernovae. https://doi.org/10.1103/physrevd.69.104026

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