Hyperonic stars and the symmetry energy

Detalhes bibliográficos
Autor(a) principal: Providência, Constança
Data de Publicação: 2018
Outros Autores: Fortin, Morgan, Pais, Helena, Rabhi, Aziz
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10316/106944
https://doi.org/10.3389/fspas.2019.00013
Resumo: 17 pages, 11 figures, 5 tables
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spelling Hyperonic stars and the symmetry energyneutron starshyperonic starssymmetry energyhyperon interactionneutron star coolingrelativistic mean-field equation of state17 pages, 11 figures, 5 tablesIn the present study we analyse the effect of the density dependence of the symmetry energy on the hyperonic content of neutron stars within a relativistic mean field description of stellar matter. For the $\Lambda$-hyperon, we consider parametrizations calibrated to $\Lambda$-hypernuclei. For the $\Sigma$ and $\Xi$-hyperons uncertainties that reflect the present lack of experimental information on $\Sigma$ and $\Xi$-hypernuclei are taken into account. We perform our study considering nuclear equations of state that predict two solar mass stars, and satisfy other well settled nuclear matter properties. The effect of the presence of hyperons on the radius, the direct Urca processes, and the cooling of accreting neutron stars are discussed. We show that some star properties are affected in a similar way by the density dependence of the symmetry energy and the hyperon content of the star. To disentangle these two effects it is essential to have a good knowledge of the equation of state at supra-saturation densities. The density dependence of the symmetry energy affects the order of appearance of the different hyperons, which may have direct implications on the neutron star cooling as different hyperonic neutrino processes processes may operate at the center of massive stars. For models which allow for the direct Urca process to operate, hyperonic and purely nucleonic ones are shown to have a similar luminosity when hyperons are included in agreement with modern experimental data. It is shown that for a density dependent hadronic model constrained by experimental, theoretical and observational data, the low-luminosity of SAX J$1808.4-3658$ can only be modelled for a hyperonic NS, suggesting that hyperons could be present in its core.Frontiers Media S.A.2018-11-02info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://hdl.handle.net/10316/106944http://hdl.handle.net/10316/106944https://doi.org/10.3389/fspas.2019.00013eng2296-987XProvidência, ConstançaFortin, MorganPais, HelenaRabhi, Azizinfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-05-03T11:08:41Zoai:estudogeral.uc.pt:10316/106944Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T21:23:20.023542Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Hyperonic stars and the symmetry energy
title Hyperonic stars and the symmetry energy
spellingShingle Hyperonic stars and the symmetry energy
Providência, Constança
neutron stars
hyperonic stars
symmetry energy
hyperon interaction
neutron star cooling
relativistic mean-field equation of state
title_short Hyperonic stars and the symmetry energy
title_full Hyperonic stars and the symmetry energy
title_fullStr Hyperonic stars and the symmetry energy
title_full_unstemmed Hyperonic stars and the symmetry energy
title_sort Hyperonic stars and the symmetry energy
author Providência, Constança
author_facet Providência, Constança
Fortin, Morgan
Pais, Helena
Rabhi, Aziz
author_role author
author2 Fortin, Morgan
Pais, Helena
Rabhi, Aziz
author2_role author
author
author
dc.contributor.author.fl_str_mv Providência, Constança
Fortin, Morgan
Pais, Helena
Rabhi, Aziz
dc.subject.por.fl_str_mv neutron stars
hyperonic stars
symmetry energy
hyperon interaction
neutron star cooling
relativistic mean-field equation of state
topic neutron stars
hyperonic stars
symmetry energy
hyperon interaction
neutron star cooling
relativistic mean-field equation of state
description 17 pages, 11 figures, 5 tables
publishDate 2018
dc.date.none.fl_str_mv 2018-11-02
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10316/106944
http://hdl.handle.net/10316/106944
https://doi.org/10.3389/fspas.2019.00013
url http://hdl.handle.net/10316/106944
https://doi.org/10.3389/fspas.2019.00013
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 2296-987X
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Frontiers Media S.A.
publisher.none.fl_str_mv Frontiers Media S.A.
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
institution RCAAP
reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
repository.mail.fl_str_mv
_version_ 1799134120825061376

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