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Probing neutron stars with the full premerger and postmerger gravitational wave signal from binary coalescences

Wijngaarden, Marcella and Chatziioannou, Katerina and Bauswein, Andreas and Clark, James A. and Cornish, Neil J. (2022) Probing neutron stars with the full premerger and postmerger gravitational wave signal from binary coalescences. Physical Review D, 105 (10). Art. No. 104019. ISSN 2470-0010. doi:10.1103/PhysRevD.105.104019.

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The gravitational wave signal emitted during the coalescence of two neutron stars carries information about the stars’ internal structure. During the long inspiral phase the main matter observable is the tidal interaction between the binary components, an effect that can be parametrically modeled with compact-binary solutions to general relativity. After the binary merger the main observable is frequency modes of the remnant, most commonly giving rise to a short-duration signal accessible only through numerical simulations. The complicated morphology and the decreasing detector sensitivity in the relevant frequencies currently hinder detection of the postmerger signal and motivate separate analyses for the premerger and postmerger data. However, planned and ongoing detector improvements could soon put the postmerger signal within reach. In this study we target the whole premerger and postmerger signal without an artificial separation at the binary merger. We construct a hybrid analysis that models the inspiral with templates based on analytical calculations and calibrated to numerical relativity and the postmerger signal with a flexible morphology-independent analysis. Applying this analysis to GW170817 we find, as expected, that the postmerger signal remains undetected. We further study simulated signals and find that we can reconstruct the full signal and simultaneously estimate both the premerger tidal deformation and the postmerger signal frequency content. Our analysis allows us to study neutron star physics using all the data available and directly test the premerger and postmerger signal for consistency thus probing effects such as the onset of the hadron-quark phase transition.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Wijngaarden, Marcella0000-0003-2804-4075
Chatziioannou, Katerina0000-0002-5833-413X
Bauswein, Andreas0000-0001-6798-3572
Clark, James A.0000-0003-3243-1393
Cornish, Neil J.0000-0002-7435-0869
Alternate Title:Probing neutron stars with the full pre-merger and post-merger gravitational wave signal from binary coalescences
Additional Information:© 2022 American Physical Society. Received 18 February 2022; accepted 20 April 2022; published 11 May 2022. We thank Will Farr and Wynn Ho for many useful discussions. We also thank Sophie Hourihane and Tyson Littenberg for discussions and assistance about BayesWave. This research has made use of data, software and/or web tools obtained from the Gravitational Wave Open Science Center (, a service of LIGO Laboratory, the LIGO Scientific Collaboration and the Virgo Collaboration. Virgo is funded by the French Centre National de Recherche Scientifique (CNRS), the Italian Istituto Nazionale della Fisica Nucleare (INFN) and the Dutch Nikhef, with contributions by Polish and Hungarian institutes. This material is based upon work supported by NSF’s LIGO Laboratory which is a major facility fully funded by the National Science Foundation. The authors are grateful for computational resources provided by the LIGO Laboratory and supported by National Science Foundation Grants No. PHY-0757058 and No. PHY-0823459. N. J. C. was supported by NSF Grant No. PHY1912053. M. W. gratefully acknowledges support and hospitality from the Simons Foundation through the predoctoral program at the Center for Computational Astrophysics, Flatiron Institute. The Flatiron Institute is supported by the Simons Foundation. A. B. acknowledges support by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme under grant agreement No. 759253, by Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)—Project-ID 279384907—SFB 1245, by DFG—Project-ID 138713538—SFB 881 (“The Milky Way System”, subproject A10) and by the State of Hesse within the Cluster Project ELEMENTS. Software: gwpy [173], matplotlib [174]. K. C. was supported by NSF Grant No. PHY-2110111.
Group:Astronomy Department, LIGO
Funding AgencyGrant Number
Centre National de la Recherche Scientifique (CNRS)UNSPECIFIED
Istituto Nazionale di Fisica Nucleare (INFN)UNSPECIFIED
Simons FoundationUNSPECIFIED
European Research Council (ERC)759253
Deutsche Forschungsgemeinschaft (DFG)SFB 1245
Deutsche Forschungsgemeinschaft (DFG)SFB 881
Issue or Number:10
Record Number:CaltechAUTHORS:20220228-183339664
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:113659
Deposited By: George Porter
Deposited On:28 Feb 2022 21:35
Last Modified:03 Jun 2022 21:22

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