Neutron star crustal properties from relativistic mean-field models and bulk parameters effects

Autor(es)

Dutra, M. ^[1] ; Lenzi, C. H. ^[1] ; de Paula, W. ^[1] ; Lourenco, O. ^[1]

Afiliação do(s) autor(es)

^[1] Inst Tecnol Aeronaut, DCTA, Dept Fis, BR-12228900 Sao Jose Dos Campos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: EUROPEAN PHYSICAL JOURNAL A; v. 57, n. 8 AUG 2021.
• Citações Web of Science: 0

Resumo

We calculate crustal properties of neutron stars, namely, mass (M-crust), radius (R-crust) and fraction of moment of inertia (Delta I/I) from parametrizations of hadronic relativistic mean-field (RMF) model consistent with symmetric and asymmetric nuclear matter constraints, as well as some stellar boundaries. We verify which one are also in agreement with restrictions of Delta I/I >= 1.4% and Delta I/I >= 7% related to the glitching mechanism observed in pulsars, such as the Vela one. The latter constraint explains the glitches phenomenon when entrainment effects are taken into account. Our findings indicate that these parametrizations pass in the glitching limit for a neutron star mass range of M <= 1.82 M-circle dot (Delta I/I >= 1.4%), and M <= 1.16 M-circle dot (Delta I/I >= 7%). We also investigate the influence of nuclear matter bulk parameters on crustal properties and find that symmetry energy is the quantity that produces the higher variations on Mcrust, Rcrust, and Delta I/I. Based on the results, we construct a particular RMF parametrization able to satisfy Delta I/I >= 7% even at M = 1.4 M-circle dot, the mass value used to fit data from the softer component of the Vela pulsar X-ray spectrum. The model also presents compatibility with observational data from PSR J1614-2230, PSR J0348 + 0432, and MSP J0740 + 6620 pulsars, as well as, with data from the Neutron Star Interior Composition Explorer (NICER) mission. (AU)

• Processo FAPESP: 20/05238-9 - Diferentes abordagens no estudo da matéria fortemente interagente
• Beneficiário: Odilon Lourenço da Silva Filho
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 17/05660-0 - Estudos teóricos da estrutura e reações de núcleos exóticos e sistemas de muitos corpos
• Beneficiário: Brett Vern Carlson
• Modalidade de apoio: Auxílio à Pesquisa - Temático