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  Observing and measuring the neutron-star equation-of-state in spinning binary neutron star systems

Harry, I., & Hinderer, T. (2018). Observing and measuring the neutron-star equation-of-state in spinning binary neutron star systems. Classical and Quantum Gravity, 35(14): 145010. doi:10.1088/1361-6382/aac7e3.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0000-BA4C-A Version Permalink: http://hdl.handle.net/21.11116/0000-0002-ECB0-D
Genre: Journal Article

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 Creators:
Harry, Ian1, Author              
Hinderer, Tanja1, Author              
Affiliations:
1Astrophysical and Cosmological Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_1933290              

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Free keywords: General Relativity and Quantum Cosmology, gr-qc
 Abstract: LIGO and Virgo recently observed the first binary neutron star merger, demonstrating that gravitational-waves offer the ability to probe how matter behaves in one of the most extreme environments in the Universe. However, the gravitational-wave signal emitted by an inspiraling binary neutron star system is only weakly dependent on the equation of state and extracting this information is challenging. Previous studies have focused mainly on binary systems where the neutron stars are spinning slowly and the main imprint of neutron star matter in the inspiral signal is due to tidal effects. For binaries with non-negligible neutron-star spin the deformation of the neutron star due to its own rotation introduces additional variations in the emitted gravitational-wave signal. Here we explore whether highly spinning binary neutron-star systems offer a better chance to measure the equation-of-state than weakly spinning binary-neutron star systems. We focus on the dominant adiabatic quadrupolar effects and consider three main questions. First, we show that equation-of-state effects can be significant in the inspiral waveforms, and that the spin-quadrupole effect dominates for rapidly rotating neutron stars. Second, we show that variations in the spin-quadrupole phasing are strongly degenerate with changes in the component masses and spins, and neglecting these terms has a negligible impact on the number of observations with second generation observatories. Finally, we explore the bias in the masses and spins that would be introduced by using incorrect equation-of-state terms. Using a novel method to rapidly evaluate an approximation of the likelihood we show that assuming the incorrect equation-of-state when measuring source parameters can lead to a significant bias. We also find that the ability to measure the equation-of-state is improved when considering spinning systems.

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 Dates: 2018-01-302018
 Publication Status: Published in print
 Pages: 29 pages (CQG formatting), 9 figures
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 Identifiers: arXiv: 1801.09972
URI: http://arxiv.org/abs/1801.09972
DOI: 10.1088/1361-6382/aac7e3
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Title: Classical and Quantum Gravity
Source Genre: Journal
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Pages: - Volume / Issue: 35 (14) Sequence Number: 145010 Start / End Page: - Identifier: -