https://doi.org/10.1140/epja/i2019-12716-4
Regular Article - Theoretical Physics
Multimessenger parameter estimation of GW170817
1
Institute for Advanced Study, 1 Einstein Drive, 08540, Princeton, NJ, USA
2
Department of Astrophysical Sciences, Princeton University, 4 Ivy Lane, 08544, Princeton, NJ, USA
* e-mail: dradice@astro.princeton.edu
Received:
30
October
2018
Accepted:
4
February
2019
Published online:
17
April
2019
We combine gravitational wave (GW) and electromagnetic (EM) data to perform a Bayesian parameter estimation of the binary neutron star (NS) merger GW170817. The EM likelihood is constructed from a fit to a large number of numerical relativity simulations which we combine with a lower bound on the mass of the remnant’s accretion disk inferred from the modeling of the EM light curve. In comparison with previous works, our analysis yields a more precise determination of the tidal deformability of the binary, for which the EM data provide a lower bound, and of the mass ratio of the binary, with the EM data favoring a smaller mass asymmetry. The 90% credible interval for the areal radius of a 
NS is found to be 
km (statistical and systematic uncertainties).
© Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature, 2019
