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Relevance of tidal effects and post-merger dynamics for binary neutron star parameter estimation

Dudi, Reetika, Pannarale Greco, Francesco ORCID:, Dietrich, Tim, Hannam, Mark ORCID:, Bernuzzi, Sebastiano, Ohme, Frank and Brügmann, Bernd 2018. Relevance of tidal effects and post-merger dynamics for binary neutron star parameter estimation. Physical Review D 98 (8) , 084061. 10.1103/PhysRevD.98.084061

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Measurements of the properties of binary neutron star systems from gravitational-wave observations require accurate theoretical models for such signals. However, current models are incomplete, as they do not take into account all of the physics of these systems: some neglect possible tidal effects, others neglect spin-induced orbital precession, and no existing model includes the post-merger regime consistently. In this work, we explore the importance of two physical ingredients: tidal interactions during the inspiral and the imprint of the post-merger stage. We use complete inspiral–merger–post-merger waveforms constructed from a tidal effective-one-body approach and numerical-relativity simulations as signals against which we perform parameter estimates with waveform models of standard LIGO-Virgo analyses. We show that neglecting tidal effects does not lead to appreciable measurement biases in masses and spin for typical observations (small tidal deformability and signal-to-noise ratio ∼25). However, with increasing signal-to-noise ratio or tidal deformability there are biases in the estimates of the binary parameters. The post-merger regime, instead, has no impact on gravitational-wave measurements with current detectors for the signal-to-noise ratios we consider.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: American Physical Society
ISSN: 2470-0010
Date of First Compliant Deposit: 4 December 2018
Date of Acceptance: 31 October 2018
Last Modified: 05 May 2023 08:57

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