Kilonova Emissions from Neutron Star Merger Remnants: Implications for the Nuclear Equation of State

Lund, Kelsey Alexandra; Somasundaram, Rahul; McLaughlin, Gail C.; Miller, Jonah Maxwell; Mumpower, Matthew Ryan; Tews, Ingo

doi:10.3847/1538-4357/add148

Kilonova Emissions from Neutron Star Merger Remnants: Implications for the Nuclear Equation of State

Journal Article · Thu Jun 26 00:00:00 EDT 2025 · The Astrophysical Journal

DOI:https://doi.org/10.3847/1538-4357/add148· OSTI ID:2575586

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North Carolina State University, Raleigh, NC (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Syracuse Univ., NY (United States)
North Carolina State University, Raleigh, NC (United States)
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Multimessenger observations of binary neutron star mergers can provide valuable information on the nuclear equation of state (EOS). Here, we investigate the extent to which electromagnetic observations of the associated kilonovae allow us to place constraints on the EOS. For this, we use state-of-the-art three-dimensional general-relativistic magnetohydrodynamics simulations and detailed nucleosynthesis modeling to connect properties of observed light curves to properties of the accretion disk, and hence, the EOS. Using our general approach, we use multimessenger observations of GW170817/AT2017gfo to study the impact of various sources of uncertainty on inferences of the EOS. We constrain the radius of a 1.4M_⊙ neutron star to lie within 10.30 ≤ R_1.4 ≤ 13.0 km and the maximum mass to be M_TOV ≤ 3.06M_⊙.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC); USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: 89233218CNA000001; AC52-06NA25396; FG02-02ER41216

OSTI ID:: 2575586

Report Number(s):: LA-UR--24-24836; 10.3847/1538-4357/add148; 1538-4357

Journal Information:: The Astrophysical Journal, Journal Name: The Astrophysical Journal Journal Issue: 1 Vol. 987; ISSN 0004-637X; ISSN 1538-4357

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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