Collapse of magnetized hypermassive neutron stars in general relativity: Disk evolution and outflows
We study the evolution in axisymmetry of accretion disks formed self-consistently through collapse of magnetized hypermassive neutron stars to black holes. Such stars can arise following the merger of binary neutron stars. They are differentially rotating, dynamically stable, and have rest masses ex...
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creator | Stephens, Branson C. Shapiro, Stuart L. Liu, Yuk Tung |
description | We study the evolution in axisymmetry of accretion disks formed self-consistently through collapse of magnetized hypermassive neutron stars to black holes. Such stars can arise following the merger of binary neutron stars. They are differentially rotating, dynamically stable, and have rest masses exceeding the mass limit for uniform rotation. However, hypermassive neutron stars are secularly unstable to collapse due to MHD-driven angular momentum transport. The rotating black hole which forms in this process is surrounded by a hot, massive, magnetized torus and a magnetic field collimated along the spin axis. This system is a candidate for the central engine of a short-hard gamma-ray burst (GRB). Our code integrates the coupled Einstein-Maxwell-MHD equations and is used to follow the collapse of magnetized hypermassive neutron star models in full general relativity until the spacetime settles down to a quasistationary state. We then employ the Cowling approximation, in which the spacetime is frozen, to track the subsequent evolution of the disk. This approximation allows us to greatly extend the disk evolutions and study the resulting outflows, which may be relevant to the generation of a GRB. We find that outflows are suppressed when a stiff equation of state is assumed for low-density disk material and are sensitive to the initial magnetic field configuration. |
doi_str_mv | 10.1103/PhysRevD.77.044001 |
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Such stars can arise following the merger of binary neutron stars. They are differentially rotating, dynamically stable, and have rest masses exceeding the mass limit for uniform rotation. However, hypermassive neutron stars are secularly unstable to collapse due to MHD-driven angular momentum transport. The rotating black hole which forms in this process is surrounded by a hot, massive, magnetized torus and a magnetic field collimated along the spin axis. This system is a candidate for the central engine of a short-hard gamma-ray burst (GRB). Our code integrates the coupled Einstein-Maxwell-MHD equations and is used to follow the collapse of magnetized hypermassive neutron star models in full general relativity until the spacetime settles down to a quasistationary state. We then employ the Cowling approximation, in which the spacetime is frozen, to track the subsequent evolution of the disk. This approximation allows us to greatly extend the disk evolutions and study the resulting outflows, which may be relevant to the generation of a GRB. We find that outflows are suppressed when a stiff equation of state is assumed for low-density disk material and are sensitive to the initial magnetic field configuration.</description><identifier>ISSN: 1550-7998</identifier><identifier>ISSN: 0556-2821</identifier><identifier>EISSN: 1550-2368</identifier><identifier>EISSN: 1089-4918</identifier><identifier>DOI: 10.1103/PhysRevD.77.044001</identifier><language>eng</language><publisher>United States</publisher><subject>ACCRETION DISKS ; APPROXIMATIONS ; BLACK HOLES ; COSMIC GAMMA BURSTS ; COSMOLOGY ; EQUATIONS OF STATE ; GENERAL RELATIVITY THEORY ; MAGNETIC FIELD CONFIGURATIONS ; MAGNETIC FIELDS ; MAGNETOHYDRODYNAMICS ; MASS ; NEUTRON STARS ; PHYSICS OF ELEMENTARY PARTICLES AND FIELDS ; ROTATION ; SPACE-TIME ; SPIN</subject><ispartof>Physical review. 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D, Particles and fields</title><description>We study the evolution in axisymmetry of accretion disks formed self-consistently through collapse of magnetized hypermassive neutron stars to black holes. Such stars can arise following the merger of binary neutron stars. They are differentially rotating, dynamically stable, and have rest masses exceeding the mass limit for uniform rotation. However, hypermassive neutron stars are secularly unstable to collapse due to MHD-driven angular momentum transport. The rotating black hole which forms in this process is surrounded by a hot, massive, magnetized torus and a magnetic field collimated along the spin axis. This system is a candidate for the central engine of a short-hard gamma-ray burst (GRB). Our code integrates the coupled Einstein-Maxwell-MHD equations and is used to follow the collapse of magnetized hypermassive neutron star models in full general relativity until the spacetime settles down to a quasistationary state. We then employ the Cowling approximation, in which the spacetime is frozen, to track the subsequent evolution of the disk. This approximation allows us to greatly extend the disk evolutions and study the resulting outflows, which may be relevant to the generation of a GRB. We find that outflows are suppressed when a stiff equation of state is assumed for low-density disk material and are sensitive to the initial magnetic field configuration.</description><subject>ACCRETION DISKS</subject><subject>APPROXIMATIONS</subject><subject>BLACK HOLES</subject><subject>COSMIC GAMMA BURSTS</subject><subject>COSMOLOGY</subject><subject>EQUATIONS OF STATE</subject><subject>GENERAL RELATIVITY THEORY</subject><subject>MAGNETIC FIELD CONFIGURATIONS</subject><subject>MAGNETIC FIELDS</subject><subject>MAGNETOHYDRODYNAMICS</subject><subject>MASS</subject><subject>NEUTRON STARS</subject><subject>PHYSICS OF ELEMENTARY PARTICLES AND FIELDS</subject><subject>ROTATION</subject><subject>SPACE-TIME</subject><subject>SPIN</subject><issn>1550-7998</issn><issn>0556-2821</issn><issn>1550-2368</issn><issn>1089-4918</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2008</creationdate><recordtype>article</recordtype><recordid>eNo10M1KAzEUhuEgCtbqDbgKuJ6av0lm3ElrVSgoouuQZs600WlSknRkvHorratzFi_f4kHompIJpYTfvq6H9Ab9bKLUhAhBCD1BI1qWpGBcVqfHX9V1dY4uUvokhDOp1Ag109B1ZpsAhxZvzMpDdj_Q4PWwhbgxKbkesIddjsHjlE1M2Hm8Ag_RdDhCZ7LrXR7u8MylLwx96HbZ7VvjGxx2ue3Cd7pEZ63pElwd7xh9zB_ep0_F4uXxeXq_KCxTZS5kRUWjRMVLZYXkQGUtaSOI5HYpW0EEo5IvhVSWl6ZURpCqBCEJE1IKwls-RjeH3ZCy08m6DHZtg_dgs2Z7p5oyuq_YobIxpBSh1dvoNiYOmhL9p6n_NbVS-qDJfwHzuGn6</recordid><startdate>20080201</startdate><enddate>20080201</enddate><creator>Stephens, Branson C.</creator><creator>Shapiro, Stuart L.</creator><creator>Liu, Yuk Tung</creator><scope>AAYXX</scope><scope>CITATION</scope><scope>OTOTI</scope></search><sort><creationdate>20080201</creationdate><title>Collapse of magnetized hypermassive neutron stars in general relativity: Disk evolution and outflows</title><author>Stephens, Branson C. ; Shapiro, Stuart L. ; Liu, Yuk Tung</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c275t-6814d748357c463e16961d4063cb6f4042163b467c35a57a4085e4602466403f3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2008</creationdate><topic>ACCRETION DISKS</topic><topic>APPROXIMATIONS</topic><topic>BLACK HOLES</topic><topic>COSMIC GAMMA BURSTS</topic><topic>COSMOLOGY</topic><topic>EQUATIONS OF STATE</topic><topic>GENERAL RELATIVITY THEORY</topic><topic>MAGNETIC FIELD CONFIGURATIONS</topic><topic>MAGNETIC FIELDS</topic><topic>MAGNETOHYDRODYNAMICS</topic><topic>MASS</topic><topic>NEUTRON STARS</topic><topic>PHYSICS OF ELEMENTARY PARTICLES AND FIELDS</topic><topic>ROTATION</topic><topic>SPACE-TIME</topic><topic>SPIN</topic><toplevel>online_resources</toplevel><creatorcontrib>Stephens, Branson C.</creatorcontrib><creatorcontrib>Shapiro, Stuart L.</creatorcontrib><creatorcontrib>Liu, Yuk Tung</creatorcontrib><collection>CrossRef</collection><collection>OSTI.GOV</collection><jtitle>Physical review. D, Particles and fields</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Stephens, Branson C.</au><au>Shapiro, Stuart L.</au><au>Liu, Yuk Tung</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Collapse of magnetized hypermassive neutron stars in general relativity: Disk evolution and outflows</atitle><jtitle>Physical review. D, Particles and fields</jtitle><date>2008-02-01</date><risdate>2008</risdate><volume>77</volume><issue>4</issue><artnum>044001</artnum><issn>1550-7998</issn><issn>0556-2821</issn><eissn>1550-2368</eissn><eissn>1089-4918</eissn><abstract>We study the evolution in axisymmetry of accretion disks formed self-consistently through collapse of magnetized hypermassive neutron stars to black holes. Such stars can arise following the merger of binary neutron stars. They are differentially rotating, dynamically stable, and have rest masses exceeding the mass limit for uniform rotation. However, hypermassive neutron stars are secularly unstable to collapse due to MHD-driven angular momentum transport. The rotating black hole which forms in this process is surrounded by a hot, massive, magnetized torus and a magnetic field collimated along the spin axis. This system is a candidate for the central engine of a short-hard gamma-ray burst (GRB). Our code integrates the coupled Einstein-Maxwell-MHD equations and is used to follow the collapse of magnetized hypermassive neutron star models in full general relativity until the spacetime settles down to a quasistationary state. We then employ the Cowling approximation, in which the spacetime is frozen, to track the subsequent evolution of the disk. This approximation allows us to greatly extend the disk evolutions and study the resulting outflows, which may be relevant to the generation of a GRB. We find that outflows are suppressed when a stiff equation of state is assumed for low-density disk material and are sensitive to the initial magnetic field configuration.</abstract><cop>United States</cop><doi>10.1103/PhysRevD.77.044001</doi></addata></record> |
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source | American Physical Society Journals |
subjects | ACCRETION DISKS APPROXIMATIONS BLACK HOLES COSMIC GAMMA BURSTS COSMOLOGY EQUATIONS OF STATE GENERAL RELATIVITY THEORY MAGNETIC FIELD CONFIGURATIONS MAGNETIC FIELDS MAGNETOHYDRODYNAMICS MASS NEUTRON STARS PHYSICS OF ELEMENTARY PARTICLES AND FIELDS ROTATION SPACE-TIME SPIN |
title | Collapse of magnetized hypermassive neutron stars in general relativity: Disk evolution and outflows |
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