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Role of the crust in the tidal deformability of a neutron star within a unified treatment of dense matter

Abstract : The role of the crust on the tidal deformability of a cold nonaccreted neutron star is studied using the recent unified equation of state BSk24. This equation of state, which is based on the nuclear energy-density-functional theory, provides a thermodynamically consistent description of all stellar regions. Results obtained with this equation of state are compared to those calculated for a putative neutron star made entirely of homogeneous matter. The presence of the crustal layers is thus found to significantly reduce the Love number k2, especially for low-mass stars. However, this reduction mainly arises from the increase in the stellar radius almost independently of the equation of state. This allows for a simple analytic estimate of k2 for realistic neutron stars using the equation of state of homogeneous matter only.
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Submitted on : Tuesday, February 18, 2020 - 10:27:02 PM
Last modification on : Wednesday, April 1, 2020 - 12:49:02 AM

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Loïc Perot, Nicolas Chamel, Aurélien Sourie. Role of the crust in the tidal deformability of a neutron star within a unified treatment of dense matter. Phys.Rev.C, 2020, 101 (1), pp.015806. ⟨10.1103/PhysRevC.101.015806⟩. ⟨hal-02483984⟩

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