Examining the possibility of a thick crust in the compact stellar object HESS J1731-347
nucl-th, astro-ph.HE, astro-ph.SR
Submitted: 2025-07-09
Updated: 2026-08-31
Comments: 8 pages, 5 figures, extended discussion of phase coexistence and EOS properties, the title changed
Journal ref: Physics Letters B 881 (2026) 140884
DOI: 10.1016/j.physletb.2026.140884
License: http://creativecommons.org/licenses/by-nc-nd/4.0/
The gist: A relativistic mean-field model with a crossing term of isovector-scalar and isoscalar mesons, the Cracow crossing terms (CCT) model, has previously been shown to be capable of explaining the light
Terminology
Abstract
A relativistic mean-field model with a crossing term of isovector-scalar and isoscalar mesons, the Cracow crossing terms (CCT) model, has previously been shown to be capable of explaining the light and compact object HESS J1731-347 [11]. Here, the model is supplemented with a correct treatment of the phase transition. Applying the thermodynamically consistent Gibbs conditions shows that a mixed-phase system occurs in the core of the neutron star over a wide range of densities, extending up to the neutron star crust, leading to an intriguing stellar structure with a thick and massive crust.
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