J/A+A/640/A77ivo://CDS.VizieR/J/A+A/640/A77doi:10.26093/cds/vizier.36400077CDSCarreau T.Fantina A.F.Gulminelli F.2021-04-07T12:56:33Z2020-08-14T07:48:58ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frpulsarsatomic-physicsThe possible presence of amorphous and heterogeneous phases in the inner crust of a neutron star is expected to reduce the electrical conductivity of the crust, with potentially important consequences on the magneto-thermal evolution of the star. In cooling simulations, the disorder is quantified by an impurity parameter which is often taken as a free parameter. We aim to give a quantitative prediction of the impurity parameter as a function of the density in the crust, performing microscopic calculations including up-to-date microphysics of the crust. A multi-component approach is developed at finite temperature using a compressible liquid drop description of the ions with an improved energy functional based on recent microscopic nuclear models and optimized on extended Thomas-Fermi calculations. Thermodynamic consistency is ensured by adding a rearrangement term and deviations from the linear mixing rule are included in the liquid phase. The impurity parameter is consistently calculated at the crystallization temperature as determined in the one-component plasma approximation for the different functionals. Our calculations show that at the crystallization temperature the composition of the inner crust is dominated by nuclei with charge number around Z~40, while the range of the Z distribution varies from about 20 near the neutron drip to about 40 closer to the crust-core transition. This reflects on the behavior of the impurity parameter that monotonically increases with density up to around 40 in the deeper regions of the inner crust. Our study shows that the contribution of impurities is non-negligible, thus potentially having an impact on the transport properties in the neutron-star crust. The obtained values of the impurity parameter represent a lower limit; larger values are expected in the presence of non-spherical geometries and/or fast cooling dynamics.2020A&A...640A..77Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/640/A77CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/633/A149 : Crystallization of neutron star outer crust (Fantina+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/640/A77https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/640/A77http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/640/A77https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/640/A77https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/640/A77http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/640/A77GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapRadiodefaultJ/A+A/640/A77/tm_bsk24Baryon density, pressure, melting temperature, and impurity parameter using BSk24PPressure (1)dPaphys.pressuredoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintnbBaryon densitycm**-3phys.densitydoubleTmCrystallization temperatureKphys.temperaturedoubleQimpImpurity parameter at Tm (2)arith.factor;pos.distancedoubleJ/A+A/640/A77/t10bsk22Baryon density, pressure, temperature, and impurity parameter using BSk22recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintnbBaryon densitycm**-3phys.densitydoublePPressure (1)dPaphys.pressuredoubleTmCrystallization temperatureKphys.temperaturedoubleQimpImpurity parameter at Tm (2)arith.factor;pos.distancedoubleJ/A+A/640/A77/t10bsk24Baryon density, pressure, temperature, and impurity parameter using BSk24TmCrystallization temperatureKphys.temperaturedoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintnbBaryon densitycm**-3phys.densitydoublePPressure (1)dPaphys.pressuredoubleQimpImpurity parameter at Tm (2)arith.factor;pos.distancedoubleJ/A+A/640/A77/t10bsk25Baryon density, pressure, temperature, and impurity parameter using BSk25recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintnbBaryon densitycm**-3phys.densitydoublePPressure (1)dPaphys.pressuredoubleTmCrystallization temperatureKphys.temperaturedoubleQimpImpurity parameter at Tm (2)arith.factor;pos.distancedoubleJ/A+A/640/A77/t10bsk26Baryon density, pressure, temperature, and impurity parameter using BSk26recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintnbBaryon densitycm**-3phys.densitydoublePPressure (1)dPaphys.pressuredoubleTmCrystallization temperatureKphys.temperaturedoubleQimpImpurity parameter at Tm (2)arith.factor;pos.distancedoubleJ/A+A/640/A77/tm_bsk22Baryon density, pressure, melting temperature, and impurity parameter using BSk22QimpImpurity parameter at Tm (2)arith.factor;pos.distancedoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintnbBaryon densitycm**-3phys.densitydoublePPressure (1)dPaphys.pressuredoubleTmCrystallization temperatureKphys.temperaturedoubleJ/A+A/640/A77/tm_bsk25Baryon density, pressure, melting temperature, and impurity parameter using BSk25recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintnbBaryon densitycm**-3phys.densitydoublePPressure (1)dPaphys.pressuredoubleTmCrystallization temperatureKphys.temperaturedoubleQimpImpurity parameter at Tm (2)arith.factor;pos.distancedoubleJ/A+A/640/A77/tm_bsk26Baryon density, pressure, melting temperature, and impurity parameter using BSk26PPressure (1)dPaphys.pressuredoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintnbBaryon densitycm**-3phys.densitydoubleTmCrystallization temperatureKphys.temperaturedoubleQimpImpurity parameter at Tm (2)arith.factor;pos.distancedouble