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Nuclear Physics Multimessenger Astrophysics Constraints on the Neutron Star Equation of State: Adding NICER’s PSR J0740+6620 Measurement

Pang, Peter T. H. ; Tews, Ingo ; Coughlin, Michael W. ; Bulla, Mattia ; Van Den Broeck, Chris ; Dietrich, Tim

The Astrophysical journal, 2021-11, Vol.922 (1), p.14 [Periódico revisado por pares]

Philadelphia: The American Astronomical Society

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  • Título:
    Nuclear Physics Multimessenger Astrophysics Constraints on the Neutron Star Equation of State: Adding NICER’s PSR J0740+6620 Measurement
  • Autor: Pang, Peter T. H. ; Tews, Ingo ; Coughlin, Michael W. ; Bulla, Mattia ; Van Den Broeck, Chris ; Dietrich, Tim
  • Assuntos: 60 APPLIED LIFE SCIENCES ; Astrophysics ; atomic, nuclear and particle physics ; Constraints ; Density ; Equations of state ; Gamma ray bursts ; Gamma rays ; Gravitational waves ; neutron star core ; Neutron star cores ; Neutron stars ; Neutrons ; Nuclear matter ; Nuclear physics ; Phase transitions ; Physics ; Pulsars ; Radio observation ; Saturation ; Stars & galaxies ; stellar mergers ; Telescopes ; Upper bounds ; X-ray astronomy
  • É parte de: The Astrophysical journal, 2021-11, Vol.922 (1), p.14
  • Notas: High-Energy Phenomena and Fundamental Physics
    AAS32455
    89233218CNA000001; AC02-05CH11231; AC52-06NA25396; PHY-2010970; 44189
    LA-UR-21-20534
    Swedish Research Council (SRC)
    National Science Foundation (NSF)
    USDOE Office of Science (SC), Nuclear Physics (NP)
    High Performance Computing Center Stuttgart (HLRS)
    USDOE National Nuclear Security Administration (NNSA)
  • Descrição: Abstract In the past few years, new observations of neutron stars (NSs) and NS mergers have provided a wealth of data that allow one to constrain the equation of state (EOS) of nuclear matter at densities above nuclear saturation density. However, most observations were based on NSs with masses of about 1.4 M ⊙ , probing densities up to ∼three to four times the nuclear saturation density. Even higher densities are probed inside massive NSs such as PSR J0740+6620. Very recently, new radio observations provided an update to the mass estimate for PSR J0740+6620, and X-ray observations by the NICER and XMM telescopes constrained its radius. Based on these new measurements, we revisit our previous nuclear physics multimessenger astrophysics constraints and derive updated constraints on the EOS describing the NS interior. By combining astrophysical observations of two radio pulsars, two NICER measurements, the two gravitational-wave detections GW170817 and GW190425, detailed modeling of the kilonova AT 2017gfo, and the gamma-ray burst GRB 170817A, we are able to estimate the radius of a typical 1.4 M ⊙ NS to be 11.94 − 0.87 + 0.76 km at 90% confidence. Our analysis allows us to revisit the upper bound on the maximum mass of NSs and disfavors the presence of a strong first-order phase transition from nuclear matter to exotic forms of matter, such as quark matter, inside NSs.
  • Editor: Philadelphia: The American Astronomical Society
  • Idioma: Inglês
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