Tidal Resonance in Binary Neutron Star Inspirals: A High-Precision Study in Numerical Relativity
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arXiv
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| Natura: | Preprint |
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2024
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| author | Kuan, Hao-Jui Kiuchi, Kenta Shibata, Masaru |
| author_facet | Kuan, Hao-Jui Kiuchi, Kenta Shibata, Masaru |
| contents | We investigate the tidal resonance of the fundamental ($f$-)mode in spinning neutron stars, robustly tracing the onset of the excitation to its saturation, using numerical relativity for the first time. We performed long-term ($\approx15$~orbits) fully relativistic simulations of a merger of two highly and retrogradely spinning neutron stars. The resonance window of the $f$-mode is extended by self-interaction, and the nonlinear resonance continues up to the final plunging phase. We observe that the quasi-circular orbit is maintained throughout since the dissipation of orbit motion due to the resonance is coherent with that due to gravitational waves. The $f$-mode resonance causes a variation in the stellar spin of $\gtrsim6.3\%$ in the linear regime and much more as $\sim33\%$ during the later nonlinear regime. At the merger, a phase shift of $\lesssim40$~radians is rendered in the gravitational waveform as a consequence of the angular momentum and energy transfers into the neutron star oscillations. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2411_16850 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Tidal Resonance in Binary Neutron Star Inspirals: A High-Precision Study in Numerical Relativity Kuan, Hao-Jui Kiuchi, Kenta Shibata, Masaru High Energy Physics - Phenomenology High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology We investigate the tidal resonance of the fundamental ($f$-)mode in spinning neutron stars, robustly tracing the onset of the excitation to its saturation, using numerical relativity for the first time. We performed long-term ($\approx15$~orbits) fully relativistic simulations of a merger of two highly and retrogradely spinning neutron stars. The resonance window of the $f$-mode is extended by self-interaction, and the nonlinear resonance continues up to the final plunging phase. We observe that the quasi-circular orbit is maintained throughout since the dissipation of orbit motion due to the resonance is coherent with that due to gravitational waves. The $f$-mode resonance causes a variation in the stellar spin of $\gtrsim6.3\%$ in the linear regime and much more as $\sim33\%$ during the later nonlinear regime. At the merger, a phase shift of $\lesssim40$~radians is rendered in the gravitational waveform as a consequence of the angular momentum and energy transfers into the neutron star oscillations. |
| title | Tidal Resonance in Binary Neutron Star Inspirals: A High-Precision Study in Numerical Relativity |
| topic | High Energy Physics - Phenomenology High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2411.16850 |