Importance of magnetic fields in highly eccentric discs with applications to tidal disruption events
arXiv:2101.01221 · doi:10.1093/mnras/staa4026
Abstract
Whether tidal disruption events (TDEs) circularise or accrete directly as a highly eccentric disc is the subject of current research and appears to depend sensitively on the disc thermodynamics. In a previous paper we applied the theory of eccentric discs to TDE discs using an prescription for the disc stress, which leads to solutions that exhibit extreme, potentially unphysical, behaviour. In this paper we further explore the dynamical vertical structure of highly eccentric discs using alternative stress models that are better motivated by the behaviour of magnetic fields in eccentric discs. We find that the presence of a coherent magnetic field has a stabilising effect on the dynamics and can significantly alter the behaviour of highly eccentric radiation dominated discs. We conclude that magnetic fields are important for the evolution of TDE discs.
arXiv comment20 pages, 20 figure, accepted in MNRAS
References in corpus (23)
- PS1-10jh: The Disruption of a Main-Sequence Star of Near-Solar Composition
- Accretion Discs with Strong Toroidal Magnetic Fields
- Non-linear fluid dynamics of eccentric discs
- ASASSN-14li: A Model Tidal Disruption Event
- On the Thermal Stability of Radiation Dominated Accretion Disks
- The Stability of Magnetized Rotating Plasmas with Superthermal Fields
- On the dynamics of magnetorotational turbulent stresses
- On the relation between viscoelastic and magnetohydrodynamic flows and their instabilities
- An alpha theory of time-dependent warped accretion discs
- Elliptical accretion and inefficient highly eccentric accretion and the low luminosity of stellar tidal disruption events
- Simulations of Magnetic Fields in Tidally-Disrupted Stars
- Local and global dynamics of eccentric astrophysical discs
- Magnetic field evolution in tidal disruption events
- Tidally distorted accretion discs in binary stars
- Hydrodynamical turbulence in eccentric circumbinary discs and its impact on the in situ formation of circumbinary planets
- The Local Instability of Steady Astrophysical Flows with non Circular Streamlines with Application to Differentially Rotating Disks with Free Eccentricity
- Hydrodynamic instability in eccentric astrophysical discs
- Instability in strongly magnetized accretion discs: A global perspective
- Eccentric Tidal Disruption Event Disks around Supermassive Black Holes: Dynamics and Thermal Emission
- Magnetic flux stabilizing thin accretion disks
- Stabilization of radiation pressure dominated accretion disks by viscous fluctuations
- Hamiltonian hydrodynamics of eccentric discs
- Dynamical structure of highly eccentric discs with applications to tidal disruption events
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- Focusing of nonlinear eccentric waves in astrophysical discs. II. Excitation and damping of tightly-wound waves
- Linear and nonlinear eccentric mode evolution in unstratified MHD discs
- Developing a Non-Newtonian Fluid Model for Dust, for Application to Astrophysical Flows