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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

Abstract

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.

Authors:
 [1]; ORCiD logo [2]
  1. Shandong Univ., Jinan (China)
  2. Texas A & M Univ., College Station, TX (United States)
Publication Date:
Research Org.:
Texas A & M Univ., Commerce, TX (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP)
OSTI Identifier:
1611287
Alternate Identifier(s):
OSTI ID: 1658242
Grant/Contract Number:  
SC0009971; SC0013702
Resource Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 879; Journal Issue: 2; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; Astronomy & Astrophysics

Citation Formats

Zhang, Nai-Bo, and Li, Bao-An. 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. United States: N. p., 2019. Web. https://doi.org/10.3847/1538-4357/ab24cb.
Zhang, Nai-Bo, & Li, Bao-An. 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. United States. https://doi.org/10.3847/1538-4357/ab24cb
Zhang, Nai-Bo, and Li, Bao-An. Wed . "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". United States. https://doi.org/10.3847/1538-4357/ab24cb. https://www.osti.gov/servlets/purl/1611287.
@article{osti_1611287,
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},
author = {Zhang, Nai-Bo and Li, Bao-An},
abstractNote = {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.},
doi = {10.3847/1538-4357/ab24cb},
journal = {The Astrophysical Journal (Online)},
number = 2,
volume = 879,
place = {United States},
year = {2019},
month = {7}
}

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Figures / Tables:

Figure 1 Figure 1: Constant surfaces of NS maximum mass of Mmax=2.01 M and Mmax=2.17 M as well as the maximum tidal deformability Λ1.4=580 (90% confidence level) for canonical NSs and the causality condition, respectively, in the J0KsymJsym parameter space for high-density neutron-rich nuclear matter.

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      Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.