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The neutron star neutron star merger GW170817: a multi–messenger study

Published online by Cambridge University Press:  27 February 2023

Giulia Gianfagna Open the ORCID record for Giulia Gianfagna [Opens in a new window] ,
Luigi Piro Open the ORCID record for Luigi Piro [Opens in a new window] ,
Eleonora Troja ,
Hendrik van Eerten Open the ORCID record for Hendrik van Eerten [Opens in a new window] ,
Geoffrey Ryan ,
Fulvio Ricci  and
Francesco Pannarale
Giulia Gianfagna
Affiliation:
INAF - Istituto di Astrofisica e Planetologia Spaziali, via Fosso del Cavaliere 100, I-00133 Rome, Italy email: giulia.gianfagna@inaf.it
Luigi Piro
Affiliation:
INAF - Istituto di Astrofisica e Planetologia Spaziali, via Fosso del Cavaliere 100, I-00133 Rome, Italy email: giulia.gianfagna@inaf.it
Eleonora Troja
Affiliation:
Dipartimento di Fisica, Università degli Studi di Roma “Tor Vergata”, Via della Ricerca Scientifica, 00133 Roma, Italy
Hendrik van Eerten
Affiliation:
Department of Physics, University of Bath, Claverton Down, Bath BA2 7AY, UK
Geoffrey Ryan
Affiliation:
Perimeter Institute for Theoretical Physics, Waterloo, Ontario, N2L 2Y5, Canada
Fulvio Ricci
Affiliation:
INFN, Sezione di Roma, I-00185 Roma, Italy Università di Roma “La Sapienza”, I-00185 Roma, Italy
Francesco Pannarale
Affiliation:
INFN, Sezione di Roma, I-00185 Roma, Italy Università di Roma “La Sapienza”, I-00185 Roma, Italy
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Abstract

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We join gravitational-wave and electromagnetic data to implement a combined simultaneous fit of the GW170817 event. The LIGO-Virgo analysis includes the estimation of the inclination, the angle of the binary with respect to the gravitationa-wave detector network line of sight. From the observations of the afterglow, instead, we can recover the viewing angle. The inclination and the viewing angle are supplementary angles, and can be treated as a single parameter. The value of the inclination that we recover from the fit is in agreement with the LIGO-Virgo previous works, with an uncertainty that is 10-fold smaller, thanks to contribution of the electromagnetic data. Moreover, with the inclusion of the gravitational-wave data, the degeneracy between the viewing angle and the jet opening angle is broken. This procedure is useful not only for analyzing GW170817, but any gravitational-wave event with an electromagnetic counterpart.

Keywords

gravitational wavesgamma rays: burstsmethods: data analysisstars: neutron
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 16 , Symposium S363: Neutron Star Astrophysics at the Crossroads: Magnetars and the Multimessenger Revolution , June 2020 , pp. 211 - 215
Copyright
© The Author(s), 2023. Published by Cambridge University Press on behalf of International Astronomical Union

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