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

Dudi, Reetika, Pannarale Greco, Francesco ORCID: https://orcid.org/0000-0002-7537-3210, Dietrich, Tim, Hannam, Mark ORCID: https://orcid.org/0000-0001-5571-325X, 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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Abstract

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:	Advanced Research Computing @ Cardiff (ARCCA) 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:	12 Jul 2024 15:11
URI:	https://orca.cardiff.ac.uk/id/eprint/117370

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