Rossby Vortices in Thin Magnetized Accretion Discs
We study the Rossby wave instability (RWI) in a thin accretion disc threaded by an initially toroidal magnetic field using the magnetohydrodynamics (MHD) code PLUTO. We find that for plasma \(10^1 < \beta < 10^3\) , the growth rate and late-time density are suppressed, whereas for plasma \(\be...
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| creator | Matilsky, Loren Dyda, Sergei Lovelace, Richard V E Lii, Patrick |
| description | We study the Rossby wave instability (RWI) in a thin accretion disc threaded by an initially toroidal magnetic field using the magnetohydrodynamics (MHD) code PLUTO. We find that for plasma \(10^1 < \beta < 10^3\) , the growth rate and late-time density are suppressed, whereas for plasma \(\beta > 10^3\), the magnetic field has negligible effect. The initially toroidal field is twisted inside the vortex and expelled at late times. This creates a radially directed field outside the vortex region, which can be understood via a simple kinematic model of a magnetic field in a rotating fluid and may be observable via polarised dust emission. |
| doi_str_mv | 10.48550/arxiv.1711.08849 |
| format | Article |
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We find that for plasma \(10^1 < \beta < 10^3\) , the growth rate and late-time density are suppressed, whereas for plasma \(\beta > 10^3\), the magnetic field has negligible effect. The initially toroidal field is twisted inside the vortex and expelled at late times. This creates a radially directed field outside the vortex region, which can be understood via a simple kinematic model of a magnetic field in a rotating fluid and may be observable via polarised dust emission.</description><identifier>EISSN: 2331-8422</identifier><identifier>DOI: 10.48550/arxiv.1711.08849</identifier><language>eng</language><publisher>Ithaca: Cornell University Library, arXiv.org</publisher><subject>Accretion disks ; Computational fluid dynamics ; Deposition ; Dust ; Magnetic fields ; Magnetohydrodynamics ; Physics - Earth and Planetary Astrophysics ; Planetary waves ; Rotating fluids ; Stability ; Vortices</subject><ispartof>arXiv.org, 2018-07</ispartof><rights>2018. 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| subjects | Accretion disks Computational fluid dynamics Deposition Dust Magnetic fields Magnetohydrodynamics Physics - Earth and Planetary Astrophysics Planetary waves Rotating fluids Stability Vortices |
| title | Rossby Vortices in Thin Magnetized Accretion Discs |
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