TY - JOUR
T1 - Breaking bad degeneracies with Love relations
T2 - Improving gravitational-wave measurements through universal relations
AU - Xie, Yiqi
AU - Chatterjee, Deep
AU - Holder, Gilbert
AU - Holz, Daniel E.
AU - Perkins, Scott
AU - Yagi, Kent
AU - Yunes, Nicolás
N1 - Funding Information:
G. H., Y. X., and N. Y. acknowledge support from NSF Grant No. AST 2009268. K. Y. acknowledges support from NSF Grants No. PHY-1806776 and No. PHY-2207349, a Sloan Foundation Research Fellowship, and the Owens Family Foundation. D. C. acknowledges support from the Illinois Survey Science Fellowship from the Center for AstroPhysical Surveys at NCSA, University of Illinois Urbana-Champaign, and the support from subawards to MIT under NSF Grants No. OAC-2117997 and No. PHY-1764464. G. H. has support from the Canadian Institute for Advanced Research and is supported by Brand Fortner. D. E. H. acknolwedges support from NSF AST-2006645, as well as support from the Kavli Institute for Cosmological Physics through an endowment from the Kavli Foundation and its founder Fred Kavli. D. E. H. also gratefully acknowledges support from the Marion and Stuart Rice Award. S. P. acknowledges partial support by the Center for AstroPhysical Surveys (CAPS) at the National Center for Supercomputing Applications (NCSA), University of Illinois Urbana-Champaign. This work made use of the Illinois Campus Cluster, a computing resource that is operated by the Illinois Campus Cluster Program (ICCP) in conjunction with NCSA, and is supported by funds from the University of Illinois at Urbana-Champaign. The authors thank Philippe Landry for reviewing the document and providing helpful feedback. This document is given the LIGO DCC No. P2200299.
Publisher Copyright:
© 2023 American Physical Society.
PY - 2023/2/15
Y1 - 2023/2/15
N2 - The distance-inclination degeneracy limits gravitational-wave parameter estimation of compact binary mergers. Although the degeneracy can be partially broken by including higher-order modes or precession, these effects are suppressed in binary neutron stars. In this work, we implement a new parametrization of the tidal effects in the binary neutron-star waveform, exploiting the binary Love relations, that breaks the distance-inclination degeneracy. The binary Love relations prescribe the tidal deformability of a neutron star as a function of its source-frame mass in an equation-of-state insensitive way and, thus, allows direct measurement of the redshift of the source. If the cosmological parameters are assumed to be known, the redshift can be converted to a luminosity distance, and the distance-inclination degeneracy can thus be broken. We implement this new approach, studying a range of binary neutron-star observing scenarios using Bayesian parameter estimation on synthetic data. In the era of the third-generation detectors, for observations with signal-to-noise ratios ranging from 6 to 167, we forecast up to an ∼70% decrease in the 90% credible interval of the distance and inclination and up to an ∼50% decrease in that of the source-frame component masses. For edge-on systems, our approach can result in moderate (∼50%) improvement in the measurements of distance and inclination for binaries with a signal-to-noise ratio as low as 10. This prescription can be used to better infer the source-frame masses and, hence, refine population properties of neutron stars, such as their maximum mass, impacting nuclear astrophysics. When combined with the search for electromagnetic counterpart observations, the work presented here can be used to put improved bounds on the opening angle of jets from binary neutron-star mergers.
AB - The distance-inclination degeneracy limits gravitational-wave parameter estimation of compact binary mergers. Although the degeneracy can be partially broken by including higher-order modes or precession, these effects are suppressed in binary neutron stars. In this work, we implement a new parametrization of the tidal effects in the binary neutron-star waveform, exploiting the binary Love relations, that breaks the distance-inclination degeneracy. The binary Love relations prescribe the tidal deformability of a neutron star as a function of its source-frame mass in an equation-of-state insensitive way and, thus, allows direct measurement of the redshift of the source. If the cosmological parameters are assumed to be known, the redshift can be converted to a luminosity distance, and the distance-inclination degeneracy can thus be broken. We implement this new approach, studying a range of binary neutron-star observing scenarios using Bayesian parameter estimation on synthetic data. In the era of the third-generation detectors, for observations with signal-to-noise ratios ranging from 6 to 167, we forecast up to an ∼70% decrease in the 90% credible interval of the distance and inclination and up to an ∼50% decrease in that of the source-frame component masses. For edge-on systems, our approach can result in moderate (∼50%) improvement in the measurements of distance and inclination for binaries with a signal-to-noise ratio as low as 10. This prescription can be used to better infer the source-frame masses and, hence, refine population properties of neutron stars, such as their maximum mass, impacting nuclear astrophysics. When combined with the search for electromagnetic counterpart observations, the work presented here can be used to put improved bounds on the opening angle of jets from binary neutron-star mergers.
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U2 - 10.1103/PhysRevD.107.043010
DO - 10.1103/PhysRevD.107.043010
M3 - Article
AN - SCOPUS:85148374445
SN - 2470-0010
VL - 107
JO - Physical Review D
JF - Physical Review D
IS - 4
M1 - 043010
ER -