Multi-messenger Observations of a Binary Neutron Star Merger
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Résumé
On 2017 August 17 a binary neutron star coalescence candidate (later designated GW170817) with merger time 12:41:04 UTC was observed through gravitational waves by the Advanced LIGO and Advanced Virgo detectors. The Fermi Gamma-ray Burst Monitor independently detected a gamma-ray burst (GRB 170817A) with a time delay of ~1.7 s with respect to the merger time. From the gravitational-wave signal, the source was initially localized to a sky region of 31 deg² at a luminosity distance of 40₋₈⁺⁸ Mpc and with component masses consistent with neutron stars. The component masses were later measured to be in the range 0.86 to 2.26 M. An extensive observing campaign was launched across the electromagnetic spectrum leading to the discovery of a bright optical transient (SSS17a, now with the IAU identification of AT 2017gfo) in NGC 4993 (at ~40 Mpc) less than 11 hours after the merger by the OneMeter, Two Hemisphere (1M2H) team using the 1 m Swope Telescope. The optical transient was independently detected by multiple teams within an hour. Subsequent observations targeted the object and its environment. Early ultraviolet observations revealed a blue transient that faded within 48 hours. Optical and infrared observations showed a redward evolution over ∼10 days. Following early non-detections, X-ray and radio emission were discovered at the transient’s position ~9 and ~16 days, respectively, after the merger. Both the X-ray and radio emission likely arise from a physical process that is distinct from the one that generates the UV/optical/near-infrared emission. No ultra-high-energy gamma-rays and no neutrino candidates consistent with the source were found in follow-up searches. These observations support the hypothesis that GW170817 was produced by the merger of two neutron stars in NGC 4993 followed by a short gamma-ray burst (GRB 170817A) and a kilonova/macronova powered by the radioactive decay of r-process nuclei synthesized in the ejecta.
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La notice
- Revue
- Americanae (AECID Library)
- Thématique
- Gamma-ray bursts and supernovae
- Domaine
- Physics and Astronomy
- Établissements canadiens
- —
- Organismes subventionnaires
- FP7 People: Marie-Curie ActionsLaboratory Directed Research and DevelopmentDivision of Human Resource DevelopmentInstitut National de Physique Nucléaire et de Physique des ParticulesLabex UnivEarthSAgencia Estatal de InvestigaciónMarsden FundEuropean Regional Development FundNational Institutes of Natural SciencesIsraeli Centers for Research ExcellenceAustralian Antarctic DivisionJapan Aerospace Exploration AgencyAgencia Nacional de Promoción Científica y TecnológicaScience and Engineering Research BoardJapan Society for the Promotion of ScienceScience and Technology Facilities CouncilNatural Sciences and Engineering Research Council of CanadaHelmholtz Alliance for Astroparticle PhysicsConseil Régional d'AlsaceIstituto Nazionale di Fisica NucleareLeibniz-GemeinschaftUniversity of NamibiaMinistério da Ciência, Tecnologia, Inovações e ComunicaçõesConseil Régional Provence-Alpes-Côte d'AzurStockholms UniversitetRussian Science FoundationMinistry of Education, IndiaUnitatea Executiva pentru Finantarea Invatamantului Superior, a Cercetarii, Dezvoltarii si InovariiFinanciadora de Estudos e ProjetosDanmarks GrundforskningsfondVetenskapsrådetCentre National de la Recherche ScientifiqueGovern de les Illes BalearsNational Commission on Research, Science and TechnologyMax-Planck-GesellschaftLiverpool John Moores UniversityIsrael Science FoundationComunidad de MadridHungarian Scientific Research FundAustralian Research CouncilGeneralitat ValencianaConsejo Nacional de Ciencia y TecnologíaCentre National d’Etudes SpatialesBeijing Normal UniversityFundação para a Ciência e a TecnologiaCompute CanadaRussian Foundation for Basic ResearchUniversity of Wisconsin-MadisonUniversiteit van AmsterdamRegione Autonoma della SardegnaConsejo Nacional de Investigaciones Científicas y TécnicasDirección General de Asuntos del Personal Académico, Universidad Nacional Autónoma de MéxicoAustrian Science FundUniversities Space Research AssociationGrantová Agentura České RepublikyHintze Family Charitable FoundationCurtin University of TechnologyDeutsche ForschungsgemeinschaftTsinghua UniversityNederlandse Organisatie voor Wetenschappelijk OnderzoekChinese Academy of SciencesInoue Foundation for ScienceTata Institute of Fundamental ResearchCommonwealth Scientific and Industrial Research OrganisationFundação de Amparo à Pesquisa do Estado de São PauloNational Radio Astronomy ObservatoryEuropean CommissionKnut och Alice Wallenbergs StiftelseScottish Funding CouncilUK Space AgencyRoyal SocietyUniversity of ManchesterBelgian Federal Science Policy OfficeBundesministerium für Bildung und ForschungUniversity of AdelaideInstitut des Origines de LyonFundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de JaneiroCalifornia Institute of TechnologyU.S. Department of EnergyUniversity of New South WalesOffice of Naval ResearchSchweizerischer Nationalfonds zur Förderung der Wissenschaftlichen ForschungBenemérita Universidad Autónoma de PueblaEGI FederationLos Alamos National LaboratoryStichting voor Fundamenteel Onderzoek der MaterieChina National Space AdministrationXunta de GaliciaStrongGoddard Space Flight CenterFonds Wetenschappelijk OnderzoekTexas Tech UniversityWestern Canada Research GridKorea Astronomy and Space Science InstituteAstronomy Australia LimitedNational Central UniversityMinisterio de Economía y CompetitividadOffice of Polar ProgramsARC Centre of Excellence for All-Sky AstrophysicsMinistry of Education, Culture, Sports, Science and TechnologyPolarforskningssekretariatetNational Key Research and Development Program of ChinaJavna Agencija za Raziskovalno Dejavnost RSNational Research FoundationAix-Marseille UniversitéCouncil of Scientific and Industrial Research, IndiaConselho Nacional de Desenvolvimento Científico e TecnológicoFonds De La Recherche Scientifique - FNRSUniverzita Karlova v PrazeSan Diego State UniversityVillum FondenNorthwestern UniversityAgence Nationale de la RechercheMinistero dell’Istruzione, dell’Università e della RicercaVlaamse regeringAustralian GovernmentU.S. Naval Research LaboratoryGrainger FoundationAutoritatea Natională pentru Cercetare StiintificăNational Research Foundation of KoreaNational Natural Science Foundation of ChinaScottish Universities Physics AlliancePlanning and Budgeting Committee of the Council for Higher Education of IsraelNational Aeronautics and Space AdministrationUniversidad Nacional Autónoma de MéxicoNational Astronomical Observatories, Chinese Academy of SciencesIstituto Nazionale di AstrofisicaUniversity of Wisconsin-MilwaukeeNanjing UniversityMinisterie van Onderwijs, Cultuur en WetenschapWeizmann Institute of ScienceAlexander von Humboldt-StiftungScience Foundation IrelandNational Science Foundation
- Mots-clés
- PhysicsNeutron starAstrophysicsGravitational waveKilonovaLIGOGamma-ray burstAstronomyRadio telescope
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