The Precursor of GRB211211A: A Tide-induced Giant Quake?

The equilibrium configuration of a solid strange star in the final inspiral phase with another compact object is generally discussed, and the starquake-related issue is revisited, for a special purpose to understand the precursor emission of binary compact star merger events (e.g., that of GRB211211...

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Bibliographic Details
Published in:Research in astronomy and astrophysics 2024-02, Vol.24 (2), p.25019
Main Authors: Zhou, Enping, Gao, Yong, Zhou, Yurui, Lai, Xiaoyu, Shao, Lijing, Wang, Weiyang, Xiong, Shaolin, Xu, Renxin, Yi, Shuxu, Yim, Garvin, Yue, Han, Zhang, Zhen
Format: Article
Language:English
Subjects:
(stars:) gamma-ray burst: general
Binary stars
black hole physics
Black holes
Companion stars
Ellipticity
Energy
Gravitational waves
Precursors
Star mergers
Starquakes
stars: neutron
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Summary:The equilibrium configuration of a solid strange star in the final inspiral phase with another compact object is generally discussed, and the starquake-related issue is revisited, for a special purpose to understand the precursor emission of binary compact star merger events (e.g., that of GRB211211A). As the binary system inspirals inward due to gravitational wave radiation, the ellipticity of the solid strangeon star increases due to the growing tidal field of its compact companion. Elastic energy is hence accumulated during the inspiral stage which might trigger a starquake before the merger when the energy exceeds a critical value. The energy released during such starquakes is calculated and compared to the precursor observation of GRB211211A. The result shows that the energy might be insufficient for binary strangeon-star case unless the entire solid strangeon star shatters, and hence favors a black hole-strangeon star scenario for GRB211211A. The timescale of the precursor as well as the frequency of the observed quasi-periodic-oscillation have also been discussed in the starquake model.
ISSN:1674-4527
2397-6209
DOI:10.1088/1674-4527/ad0825