2018/12/31 by Michael W. Coughlin, Tim Dietrich, Ben Margalit +1 · 1 citation
Physics and Astronomy · #astro-ph.HE
paper · pdf · doi:10.1093/mnrasl/slz133
arxiv created 2021/02/04 · arxiv updated 2021/02/05
The combined detection of a binary neutron-star merger in both gravitational waves (GWs) and electromagnetic (EM) radiation spanning the entire spectrum -- GW170817 / AT2017gfo / GRB170817A -- marks a breakthrough in the field of multi-messenger astronomy. Between the plethora of modeling and observations, the rich synergy that exists among the available data sets creates a unique opportunity to constrain the binary parameters, the equation of state of supranuclear density matter, and the physical processes at work during the kilonova and gamma-ray burst. We report, for the first time, Bayesian parameter estimation combining information from GW170817, AT2017gfo, GRB170817 to obtain truly multi-messenger constraints on the tidal deformability Λ ∈ [302,860], total binary mass M ∈ [2.722,2.751] M_\odot, the radius of a 1.4 solar mass neutron star R ∈ [11.3,13.5] \rm km (with additional 0.2 \rm km systematic uncertainty), and an upper bound on the mass ratio of q ≤ 1.27, all at 90% confidence. Our joint novel analysis makes use of new phenomenological descriptions of the dynamical ejecta, debris disk mass, and remnant black hole properties, all derived from a large suite of numerical relativity simulations.