Abstract
On August 17, 2017, the Advanced LIGO and Advanced Virgo gravitational-wave detectors observed a low-mass compact binary inspiral. The initial sky localization of the source of the gravitational-wave signal, GW170817, allowed electromagnetic observatories to identify NGC 4993 as the host galaxy. In this work, we improve initial estimates of the binary's properties, including component masses, spins, and tidal parameters, using the known source location, improved modeling, and recalibrated Virgo data. We extend the range of gravitational-wave frequencies considered down to 23 Hz, compared to 30 Hz in the initial analysis. We also compare results inferred using several signal models, which are more accurate and incorporate additional physical effects as compared to the initial analysis. We improve the localization of the gravitational-wave source to a 90% credible region of 16 deg2. We find tighter constraints on the masses, spins, and tidal parameters, and continue to find no evidence for nonzero component spins. The component masses are inferred to lie between 1.00 and 1.89 M when allowing for large component spins, and to lie between 1.16 and 1.60 M (with a total mass 2.73-0.01+0.04 M) when the spins are restricted to be within the range observed in Galactic binary neutron stars. Using a precessing model and allowing for large component spins, we constrain the dimensionless spins of the components to be less than 0.50 for the primary and 0.61 for the secondary. Under minimal assumptions about the nature of the compact objects, our constraints for the tidal deformability parameter Λ are (0,630) when we allow for large component spins, and 300-230+420 (using a 90% highest posterior density interval) when restricting the magnitude of the component spins, ruling out several equation-of-state models at the 90% credible level. Finally, with LIGO and GEO600 data, we use a Bayesian analysis to place upper limits on the amplitude and spectral energy density of a possible postmerger signal.
| Original language | English |
|---|---|
| Article number | 011001 |
| Journal | Physical Review X |
| Volume | 9 |
| Issue number | 1 |
| DOIs | |
| State | Published - 2 Jan 2019 |
| Externally published | Yes |
Bibliographical note
Publisher Copyright:© 2019 authors. Published by the American Physical Society.
Funding
The authors gratefully acknowledge the support of the United States National Science Foundation (NSF) for the construction and operation of the LIGO Laboratory and Advanced LIGO, as well as the Science and Technology Facilities Council (STFC) of the United Kingdom, the Max-Planck-Society (MPS), and the State of Niedersachsen/Germany for support of the construction of Advanced LIGO and construction and operation of the GEO600 detector. Additional support for Advanced LIGO was provided by the Australian Research Council. The authors gratefully acknowledge the Italian Istituto Nazionale di Fisica Nucleare (INFN), the French Centre National de la Recherche Scientifique (CNRS) and the Foundation for Fundamental Research on Matter supported by the Netherlands Organisation for Scientific Research, for the construction and operation of the Virgo detector and the creation and support of the EGO consortium. The authors also gratefully acknowledge research support from these agencies as well as by the Council of Scientific and Industrial Research of India; the Department of Science and Technology, India; the Science & Engineering Research Board (SERB), India; the Ministry of Human Resource Development, India; the Spanish Agencia Estatal de Investigación; the Vicepresidència i Conselleria d’Innovació; Recerca i Turisme and the Conselleria d’Educació i Universitat del Govern de les Illes Balears; the Conselleria d’Educació, Investigació, Cultura i Esport de la Generalitat Valenciana; the National Science Centre of Poland; the Swiss National Science Foundation (SNSF); the Russian Foundation for Basic Research; the Russian Science Foundation; the European Commission; the European Regional Development Funds (ERDF); the Royal Society; the Scottish Funding Council; the Scottish Universities Physics Alliance; the Hungarian Scientific Research Fund (OTKA); the Lyon Institute of Origins (LIO); the Paris Île-de-France Region; the National Research, Development and Innovation Office Hungary (NKFI); the National Research Foundation of Korea; Industry Canada and the Province of Ontario through the Ministry of Economic Development and Innovation; the Natural Science and Engineering Research Council Canada; the Canadian Institute for Advanced Research; the Brazilian Ministry of Science, Technology, Innovations, and Communications; the International Center for Theoretical Physics South American Institute for Fundamental Research (ICTP-SAIFR); the Research Grants Council of Hong Kong; the National Natural Science Foundation of China (NSFC); the Leverhulme Trust; the Research Corporation; the Ministry of Science and Technology (MOST), Taiwan; and the Kavli Foundation. The authors gratefully acknowledge the support of the NSF, STFC, Max-Planck-Society (MPS), INFN, CNRS, and the State of Niedersachsen/Germany for provision of computational resources. The GW strain data for this event are available at the LIGO Open Science Center . This article has been assigned the document number LIGO-P1800061.
| Funders | Funder number |
|---|---|
| Not added | ST/N005422/1, ST/M005844/1, ST/N005406/2, ST/I006269/1, ST/K000845/1, ST/N000633/1, ST/N000668/1, ST/N000072/1, ST/P000258/1, ST/H002006/1, ST/N005430/1 |
| Paris Île-de-France Region | |
| National Science Foundation | 1707965, 1708081, 1921006, 1806824, 1912632, 1716394, 1700765, 1707835, 1726215, 1806461 |
| Kavli Foundation | |
| National Kidney Foundation of Iowa | |
| Canadian Institute for Advanced Research | |
| Institut des Origines de Lyon | |
| Natural Sciences and Engineering Research Council of Canada | |
| Ontario Ministry of Economic Development and Innovation | |
| Science and Technology Facilities Council | PPA/G/S/2002/00652, Gravitational Waves, ST/J00166X/1 |
| Leverhulme Trust | |
| Royal Society | |
| Scottish Funding Council | |
| Scottish Universities Physics Alliance | |
| European Commission | |
| Australian Research Council | |
| Department of Science and Technology, Ministry of Science and Technology, India | |
| Council of Scientific and Industrial Research, India | |
| Japan Society for the Promotion of Science | 18F18013, 18H03698 |
| Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung | |
| National Natural Science Foundation of China | |
| Science and Engineering Research Board | |
| Russian Foundation for Basic Research | |
| Research Grants Council, University Grants Committee | |
| Industry Canada | |
| Nederlandse Organisatie voor Wetenschappelijk Onderzoek | |
| Generalitat Valenciana | |
| Hungarian Scientific Research Fund | |
| National Research Foundation of Korea | |
| Instituto Nazionale di Fisica Nucleare | |
| Narodowe Centrum Nauki | |
| Ministry of Human Resource Development | |
| Ministry of Science and Technology, Taiwan | |
| Centre National de la Recherche Scientifique | |
| Russian Science Foundation | |
| European Regional Development Fund | |
| Universitat de les Illes Balears | |
| Nemzeti Kutatási Fejlesztési és Innovációs Hivatal | |
| Agencia Estatal de Investigación | |
| Ministério da Ciência, Tecnologia, Inovações e Comunicações | |
| Istituto Nazionale di Fisica Nucleare | |
| ICTP South American Institute for Fundamental Research |