SMuK 2023 – wissenschaftliches Programm
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GR: Fachverband Gravitation und Relativitätstheorie
GR 9: Gravitational Waves and Astrophysics I
GR 9.4: Vortrag
Mittwoch, 22. März 2023, 17:00–17:20, ZEU/0260
Packed Message delivered by Tides in Binary Neutron Star Mergers — •Hao-Jui Kuan1 and Kostas Kokkotas2 — 1Albert-Einstein-Institut, Potsdam, Germany — 2University of Tübingen, Tübingen, Germany
The morphology of gravitational waveforms depends on almost all source parameters, and thus encodes a bunch of information about the radiating objects. In particular, tidal parameters of neutron stars may stringently constrain the nuclear equation of state, thus their precise estimation is of fundamental importance. Emphasizing the tidal phase shift by aligned, rotating stars, we provide an accurate, yet economical, method to generate f-mode-involved, premerger waveforms. We find for slow-rotating stars that the dephasing effects of the dynamical tides can be uniquely, equation-of-state-independently determined by the direct observables. In addition, for binaries with fast rotating members, the dephasing due to f-mode is larger than that caused by equilibrium tides by a factor of ∼5, which may lead to a considerably overestimated tidal deformability if the dynamical tidal contribution is not accounted for. The influence of inclination angles of stellar spins will be discussed also, as well as the possibility of accompanying precursors flares associated with f-mode excitation.