Implications of the Mass $M={2.17}_{-0.10}^{+0.11}$ M ⊙ of PSR J0740+6620 on the Equation of State of Super-dense Neutron-rich Nuclear Matter

Zhang, Nai-Bo; Li, Bao-An

doi:10.3847/1538-4357/ab24cb

Title: Implications of the Mass $$M={2.17}_{-0.10}^{+0.11}$$ M _⊙ of PSR J0740+6620 on the Equation of State of Super-dense Neutron-rich Nuclear Matter

Journal Article · Wed Jul 10 00:00:00 EDT 2019 · The Astrophysical Journal (Online)

DOI:https://doi.org/10.3847/1538-4357/ab24cb· OSTI ID:1611287

Zhang, Nai-Bo ^[1];

^[2]

Shandong Univ., Jinan (China)
Texas A & M Univ., College Station, TX (United States)

We study the implications of the very recently reported mass $$M={2.17}_{-0.10}^{+0.11}$$ M_⊙ of PSR J0740+6620 on the equation of state (EOS) of super-dense neutron-rich nuclear matter with respect to existing constraints on the EOS based on the mass M = 2.01 ± 0.04 M_⊙ of PSR J0348+0432, the maximum tidal deformability of GW170817, and earlier results of various terrestrial nuclear laboratory experiments. The lower limit of the skewness J₀ measuring the stiffness of super-dense isospin-symmetric nuclear matter is raised from about -220 MeV to -150 MeV, significantly reducing its current uncertainty range. The lower bound of the high-density symmetry energy also increases appreciably leading to a rise of the minimum proton fraction in neutron stars at β-equilibrium from about 0% to 5% around three times the saturation density of nuclear matter. The difficulties for some of the most widely used and previously well tested model EOSs to simultaneously predict both a maximum mass higher than 2.17 M_⊙ and a pressure consistent with that extracted from GW170817 present some interesting new challenges for nuclear theories.

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Research Organization:: Texas A & M Univ., Commerce, TX (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: SC0009971; SC0013702

OSTI ID:: 1611287

Alternate ID(s):: OSTI ID: 1658242

Journal Information:: The Astrophysical Journal (Online), Vol. 879, Issue 2; ISSN 1538-4357

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 45 works

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Title: Implications of the Mass $$M={2.17}_{-0.10}^{+0.11}$$ M ⊙ of PSR J0740+6620 on the Equation of State of Super-dense Neutron-rich Nuclear Matter

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