Contribution to the angular momentum transport paradigm for accretion disks

We analyze the stationary configuration of a thin axisymmetric stellar accretion disk, neglecting non-linear terms in the plasma poloidal velocity components. We set up the Grad-Shafranov equation for the system, including the plasma differential rotation (according to the so-called co-rotation theo...

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Autores principales:	Giovanni Montani, Nakia Carlevaro
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Accretion and accretion disks Plasma astrophysics Magneto-hydrodynamics Physics QC1-999
Acceso en línea:	https://doaj.org/article/61660e424ce94f74ab635b260b9afcfb
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spelling	oai:doaj.org-article:61660e424ce94f74ab635b260b9afcfb2021-12-04T04:32:40ZContribution to the angular momentum transport paradigm for accretion disks0370-269310.1016/j.physletb.2021.136769https://doaj.org/article/61660e424ce94f74ab635b260b9afcfb2021-12-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S0370269321007097https://doaj.org/toc/0370-2693We analyze the stationary configuration of a thin axisymmetric stellar accretion disk, neglecting non-linear terms in the plasma poloidal velocity components. We set up the Grad-Shafranov equation for the system, including the plasma differential rotation (according to the so-called co-rotation theorem). Then, we study the small scale backreaction of the disk to the central body magnetic field and we calculate the resulting radial infalling velocity. We show that the small scale radial oscillation of the perturbed magnetic surface is associated to the emergence of relevant toroidal current densities, able to balance the Ohm law even in the presence of quasi-ideal values of the plasma resistivity. The contribution to the infalling velocity of the averaged backreaction contrasts accretion, but it remains negligible as far as the induced magnetic field is small compared to that of the central body.Giovanni MontaniNakia CarlevaroElsevierarticleAccretion and accretion disksPlasma astrophysicsMagneto-hydrodynamicsPhysicsQC1-999ENPhysics Letters B, Vol 823, Iss , Pp 136769- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Accretion and accretion disks Plasma astrophysics Magneto-hydrodynamics Physics QC1-999
spellingShingle	Accretion and accretion disks Plasma astrophysics Magneto-hydrodynamics Physics QC1-999 Giovanni Montani Nakia Carlevaro Contribution to the angular momentum transport paradigm for accretion disks
description	We analyze the stationary configuration of a thin axisymmetric stellar accretion disk, neglecting non-linear terms in the plasma poloidal velocity components. We set up the Grad-Shafranov equation for the system, including the plasma differential rotation (according to the so-called co-rotation theorem). Then, we study the small scale backreaction of the disk to the central body magnetic field and we calculate the resulting radial infalling velocity. We show that the small scale radial oscillation of the perturbed magnetic surface is associated to the emergence of relevant toroidal current densities, able to balance the Ohm law even in the presence of quasi-ideal values of the plasma resistivity. The contribution to the infalling velocity of the averaged backreaction contrasts accretion, but it remains negligible as far as the induced magnetic field is small compared to that of the central body.
format	article
author	Giovanni Montani Nakia Carlevaro
author_facet	Giovanni Montani Nakia Carlevaro
author_sort	Giovanni Montani
title	Contribution to the angular momentum transport paradigm for accretion disks
title_short	Contribution to the angular momentum transport paradigm for accretion disks
title_full	Contribution to the angular momentum transport paradigm for accretion disks
title_fullStr	Contribution to the angular momentum transport paradigm for accretion disks
title_full_unstemmed	Contribution to the angular momentum transport paradigm for accretion disks
title_sort	contribution to the angular momentum transport paradigm for accretion disks
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/61660e424ce94f74ab635b260b9afcfb
work_keys_str_mv	AT giovannimontani contributiontotheangularmomentumtransportparadigmforaccretiondisks AT nakiacarlevaro contributiontotheangularmomentumtransportparadigmforaccretiondisks
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Contribution to the angular momentum transport paradigm for accretion disks

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