Abstract.
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 \( 1.4 M_\odot\) NS is found to be \( 12.2^{+1.0}_{-0.8} \pm 0.2\) km (statistical and systematic uncertainties).
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Radice, D., Dai, L. Multimessenger parameter estimation of GW170817. Eur. Phys. J. A 55, 50 (2019). https://doi.org/10.1140/epja/i2019-12716-4
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DOI: https://doi.org/10.1140/epja/i2019-12716-4