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Constant circulation sequences of binary neutron stars and their spin characterization

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Constant circulation sequences of binary neutron stars and their spin characterization

dc.contributor.author	Tsokaros, Antonios
dc.contributor.author	Uryū, Kōji
dc.contributor.author	Ruiz Meneses, Milton Javier
dc.contributor.author	Shapiro, Stuart L.
dc.date.accessioned	2023-06-02T11:10:44Z
dc.date.available	2023-06-02T11:10:44Z
dc.date.issued	2018
dc.identifier.citation	Tsokaros, Antonios Ury&#363, K&#333ji Ruiz Meneses, Milton Javier Shapiro, Stuart L. 2018 Constant circulation sequences of binary neutron stars and their spin characterization Physical Review D 98 12 1 10
dc.identifier.uri	https://hdl.handle.net/10550/87660
dc.description.abstract	For isentropic fluids, dynamical evolution of a binary system conserves the baryonic mass and circulation; therefore, sequences of constant rest mass and constant circulation are of particular importance. In this work, we present the extension of our Compact Object CALculator (cocal) code to compute such quasiequilibria and compare them with the well-known corotating and irrotational sequences, the latter being the simplest, zero-circulation case. The circulation as a measure of the spin for a neutron star in a binary system has the advantage of being exactly calculable since it is a local quantity. To assess the different measures of spin, such as the angular velocity of the star, the quasilocal, dimensionless spin parameter J/M2, or the circulation C, we first compute sequences of single, uniformly rotating stars and describe how the different spin diagnostics are related to each other. The connection to spinning binary systems is accomplished through the concept of circulation and the use of the constant rotational velocity formulation. Finally, we explore a modification of the latter formulation that naturally leads to differentially rotating binary systems.
dc.language.iso	eng
dc.relation.ispartof	Physical Review D, 2018, vol. 98, num. 12, p. 1-10
dc.subject	Astronomia
dc.subject	Astrofísica
dc.title	Constant circulation sequences of binary neutron stars and their spin characterization
dc.type	journal article
dc.date.updated	2023-06-02T11:10:45Z
dc.identifier.doi	10.1103/PhysRevD.98.124019
dc.identifier.idgrec	160081
dc.rights.accessRights	open access