Astrophys. J., 930, 4-4 (2022/May-1)
The Bulk Properties of Isolated Neutron Stars Inferred from the Gravitational Redshift Measurements.
LUO C.-N., TANG S.-P., JIANG J.-L., GAO W.-H. and WEI D.-M.
Abstract (from CDS):
The measurements of the bulk properties of most isolated neutron stars (INSs) are challenging tasks. Tang et al. have developed a new method, based on the equation of state (EoS) of neutron star (NS) material constrained by the observational data, to infer the gravitational masses of a few INSs whose gravitational redshifts are available. However, in that work, the authors only considered the constraints on the EoS from nuclear experiments/theories and the gravitational wave data of GW170817; the possible phase transition has not been taken into account. In this work, we adopt three EoS models (including the one incorporates a first-order strong phase transition) that are constrained by the latest multimessenger NS data, including in particular the recent mass-radius measurements of two NSs by Neutron Star Interior Composition Explorer, to update the estimation of the gravitational masses of RBS 1223, RX J0720.4-3125, and RX J1856.5-3754. In comparison to our previous approach, the new constraints are tighter, and the gravitational masses are larger by about 0.1M☉. All the inferred gravitational masses are within the range of the NS masses measured in other ways. We have also calculated the radius, tidal-deformability, and moment of inertia of these sources. The inclusion of the first-order strong phase transition has little influence on modifying the results.
© 2022. The Author(s). Published by the American Astronomical Society.
Single x-ray stars - Gravitational waves - Neutron stars - Neutron star cores
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