Journal
PHYSICAL REVIEW D
Volume 92, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.92.044045
Keywords
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Funding
- NSF [PHY-1308621, PHY-0969811, PHY-1308727]
- NASA's ATP program [NNX13AH01G]
- NSERC through a Discovery Grant
- CIFAR
- Spanish Ministry of Education and Science through a Ramon y Cajal grant
- Spanish Ministry of Economy and Competitiveness Grant [FPA2013-41042-P]
- NASA through Hubble Fellowship Grant [51344.001-A]
- Space Telescope Science Institute
- NASA [NAS 526555]
- Industry Canada
- Province of Ontario through the Ministry of Research Innovation
- Direct For Mathematical & Physical Scien
- Division Of Physics [1308727] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [1308621] Funding Source: National Science Foundation
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We study the merger of binary neutron stars using different realistic, microphysical nuclear equations of state, as well as incorporating magnetic field and neutrino cooling effects. In particular, we concentrate on the influence of the equation of state on the gravitational wave signature and also on its role, in combination with cooling and electromagnetic effects, in determining the properties of the hypermassive neutron star resulting from the merger, the production of neutrinos, and the characteristics of ejecta from the system. The ejecta we find are consistent with other recent studies that find soft equations of state produce more ejecta than stiffer equations of state. Moreover, the degree of neutron richness increases for softer equations of state. In light of reported kilonova observations (associated to GRB 130603B and GRB 060614) and the discovery of relatively low abundances of heavy, radioactive elements in deep sea deposits (with respect to possible production via supernovae), we speculate that a soft equation of state (EOS) might be preferred-because of its significant production of sufficiently neutron rich ejecta-if such events are driven by binary neutron star mergers. We also find that realistic magnetic field strengths, obtained with a subgrid model tuned to capture magnetic amplification via the Kelvin-Helmholtz instability at merger, are generally too weak to affect the gravitational wave signature postmerger within a time scale of approximate to 10 ms but can have subtle effects on the postmerger dynamics.
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