Discrepancy in tidal deformability of GW170817 between the Advanced LIGO twin detectors

Abstract

We find that the Hanford and Livingston detectors of Advanced LIGO derive a distinct posterior probability distribution of binary tidal deformability tilde{Lambda} of the first binary-neutron-star merger GW170817. By analyzing public data of GW170817 with a nested-sampling engine and the default TaylorF2 waveform provided by the LALInference package, the probability distribution of the binary tidal deformability derived by the LIGO-Virgo detector network turns out to be determined dominantly by the Hanford detector. Specifically, by imposing the flat prior on tidal deformability of individual stars, symmetric 90% credible intervals of tilde{Lambda} are estimated to be 527^{+619}_{-345} with the Hanford detector, 927^{+522}_{-619} with the Livingston detector, and 455^{+668}_{-281} with the LIGO-Virgo detector network. Furthermore, the distribution derived by the Livingston detector changes irregularly when we vary the maximum frequency of the data used in the analysis. This feature is not observed for the Hanford detector. While they are all consistent, the discrepancy and irregular behavior suggest that an in-depth study of noise properties might improve our understanding of GW170817 and future events.

7 pages, 3 figures, matched to the published version

References in corpus (14)

• GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
• GWTC-1: A Gravitational-Wave Transient Catalog of Compact Binary Mergers Observed by LIGO and Virgo during the First and Second Observing Runs
• GW170817: Measurements of Neutron Star Radii and Equation of State
• Properties of the binary neutron star merger GW170817
• Constraining neutron star tidal Love numbers with gravitational wave detectors
• Robust parameter estimation for compact binaries with ground-based gravitational-wave observations using the LALInference software library
• Tidal Deformabilities and Radii of Neutron Stars from the Observation of GW170817
• Post-1-Newtonian tidal effects in the gravitational waveform from binary inspirals
• Matter imprints in waveform models for neutron star binaries: tidal and self-spin effects
• J-GEM observations of an electromagnetic counterpart to the neutron star merger GW170817
• Mitigation of the instrumental noise transient in gravitational-wave data surrounding GW170817
• Sub-radian-accuracy gravitational waveforms of coalescing binary neutron stars in numerical relativity
• Frequency-domain gravitational waveform models for inspiraling binary neutron stars
• Constraining the p-mode--g-mode tidal instability with GW170817

Cited by in corpus (12)

• Neutron star tidal deformability and equation of state constraints
• Gravitational waves from neutron star mergers and their relation to the nuclear equation of state
• Waveform systematics in the gravitational-wave inference of tidal parameters and equation of state from binary neutron star signals
• Delta baryons and diquark formation in the cores of neutron stars
• $\mathtt{bajes}$: Bayesian inference of multimessenger astrophysical data, methods and application to gravitational-waves
• Gravitational-wave constraints on the GWTC-2 events by measuring the tidal deformability and the spin-induced quadrupole moment
• Reanalysis of the binary neutron star mergers GW170817 and GW190425 using numerical-relativity calibrated waveform models
• Multipole tidal effects in the post-Newtonian gravitational-wave phase of compact binary coalescences
• GW170817 event rules out general relativity in favor of vector gravity
• Follow-up analyses of the binary-neutron-star signals GW170817 and GW190425 by using post-Newtonian waveform models
• Modeling matter(s) in SEOBNRv5THM: Generating fast and accurate effective-one-body waveforms for spin-aligned binary neutron stars
• The roles of individual advanced LIGO detectors on revealing the neutron star properties