Journal
ASTROPHYSICAL JOURNAL
Volume 904, Issue 1, Pages -Publisher
IOP Publishing Ltd
DOI: 10.3847/1538-4357/abbb37
Keywords
Neutron stars; Compact objects; Nuclear astrophysics; Gravitational wave astronomy
Categories
Funding
- National Natural Science Foundation of China [11775119, 11675083, 11405116]
- Natural Science Foundation of Tianjin
- China Scholarship Council [201906205013, 201906255002]
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A compact object was observed with a mass of 2.50-2.67 M-circle dot by LIGO Scientific and Virgo collaborations (LVC) in GW190814, which provides a great challenge to investigations of supranuclear matter. To study this object, the properties of the neutron star are systematically calculated within the latest density-dependent relativistic meanfield (DDRMF) parameterizations, which are determined by the ground-state properties of spherical nuclei. The maximum masses of the neutron star calculated by DD-MEX and DD-LZ1 sets can be around 2.55 M-circle dot with quite stiff equations of state generated by their strong repulsive contributions from vector potentials at high densities. Their maximum speeds of sound cs/c are smaller than 0.8 at the center of the neutron star, and the dimensionless tidal deformabilities at 1.4 M-circle dot are less than 800. Furthermore, the radii of 1.4 M-circle dot also satisfy the constraint from the observation of simultaneous mass-radius measurements (Neutron star Interior Composition Explorer). Therefore, we conclude that one cannot exclude the possibility of the secondary object in GW190814 as a neutron star composed of hadron matter from DDRMF models.
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