GW170817: Joint Constraint on the Neutron Star Equation of State from Multimessenger Observations
David RadiceDepartment of Astrophysical Sciences, Princeton University, 4 Ivy Lane, Princeton, NJ 08544, USAAlbino PeregoDipartimento di Fisica, Università degli Studi di Milano Bicocca, Piazza della Scienza 3, I-20126 Milano, ItaliaFrancesco ZappaDipartimento di Scienze Matematiche Fisiche ed Informatiche, Universitá di Parma, I-43124 Parma, ItaliaSebastiano BernuzziDipartimento di Scienze Matematiche Fisiche ed Informatiche, Universitá di Parma, I-43124 Parma, Italia
2018en
ABI
Abstract
Abstract Gravitational waves detected from the binary neutron star (NS) merger GW170817 constrained the NS equation of state by placing an upper bound on certain parameters, describing the binary’s tidal interactions. We show that the interpretation of the UV/optical/infrared counterpart of GW170817 with kilonova models, combined with new numerical-relativity results, imply a complementary lower bound on the tidal deformability parameter. The joint constraints tentatively rule out both extremely stiff and soft NS equations of state.
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