3D MHD Simulations of Accretion onto Stars with Tilted Magnetic and Rotational Axes

Abstract

We present results of global three-dimensional (3D) magnetohydrodynamic (MHD) simulations of accretion onto magnetized stars where both the magnetic and rotational axes of the star are tilted about the rotational axis of the disc. We observed that initially the inner parts of the disc are warped, tilted, and process due to the magnetic interaction between the magnetosphere and the disc. Later, larger tilted discs form with the size increasing with the magnetic moment of the star. The normal vector to the discs are tilted at different angles, from 5-10 degrees up to 30-40 degrees. Small tilts may result from the winding of the magnetic field lines about the rotational axis of the star and the action of the magnetic force which tends to align the disc. Another possible explanation is the magnetic Bardeen-Petterson effect in which the disc settles in the equatorial plane of the star due to precessional and viscous torques in the disc. Tilted discs slowly precess with the time scale of the order of 50 Keplerian periods at the reference radius (approx. 3 stellar radii). Our results can be applied to different types of stars where signs of tilted discs and/or slow precession have been observed.

arXiv comment14 pages, 13 figures, MNRAS, accepted. The new version of the paper is more complete compared with the earlier version

References in corpus (35)

• The Magnetic Fields of Classical T Tauri Stars
• Global General Relativistic MHD Simulation of a Tilted Black-Hole Accretion Disk
• Three-dimensional Simulations of Disk Accretion to an Inclined Dipole: II. Hot Spots and Variability
• Spin-Up/Spin-Down of Magnetized Stars with Accretion Disks and Outflows
• Three-dimensional Simulations of Disk Accretion to an Inclined Dipole: I. Magnetospheric Flow at Different Theta
• Numerical Magnetohydrodynamics in Astrophysics: Algorithm and Tests for One-Dimensional Flow
• MHD Simulations of Disk-Magnetized Star Interactions in Quiescent Regime: Funnel Flows and Angular Momentum Transport
• The non-linear fluid dynamics of a warped accretion disc
• Evolution of Spin Direction of Accreting Magnetic Protostars and Spin-Orbit Misalignment in Exoplanetary Systems
• Magnetic fields and accretion flows on the classical T Tauri star V2129 Oph
• Locking of the Rotation of Disk-Accreting Magnetized Stars
• Accretion funnels onto weakly magnetized young stars
• Unstable Disk Accretion to Magnetized Stars: First Global 3D MHD Simulations
• Magnetically Driven Warping, Precession and Resonances in Accretion Disks
• Magnetospheric accretion and spin-down of the prototypical classical T Tauri star AATau
• Bardeen-Petterson Alignment, Jets and Magnetic Truncation in GRMHD Simulations of Tilted Thin Accretion Discs
• The evolution of a warped disc around a Kerr black hole
• Non-stationary dynamo & magnetospheric accretion processes of the classical T Tauri star V2129 Oph
• Rapid Oscillations in Cataclysmic Variables
• Accretion to Stars with Non-dipole Magnetic Fields
• Evolution of Spin Direction of Accreting Magnetic Protostars and Spin-Orbit Misalignment in Exoplanetary Systems: II. Warped Discs
• Warps, bending and density waves excited by rotating magnetized stars: results of global 3D MHD simulations
• Boundary between Stable and Unstable Regimes of Accretion. Ordered and Chaotic Unstable Regimes
• Three Dimensional MHD Simulations of Accretion to an Inclined Rotator: The "Cubed Sphere" Method
• Three-dimensional Simulations of Accretion to Stars with Complex Magnetic Fields
• Accretion, Outflows, and Winds of Magnetized Stars
• MRI-driven Accretion on to Magnetized stars: Global 3D MHD Simulations of Magnetospheric and Boundary Layer Regimes
• Oscillations of MHD shock waves on the surfaces of T Tauri stars
• MRI-driven Accretion onto Magnetized stars: Axisymmetric MHD Simulations
• Long-term variability of T Tauri stars using WASP
• Source to Accretion Disk Tilt
• Formation of Accretion Disks in Close-Binary Systems with Magnetic Fields
• Equation of the field lines of an axisymmetric multipole with a source surface
• Search for Keplerian periods in light variations of T Tauri stars and Herbig Ae stars
• Lense-Thirring Precession of Misaligned Discs I

Cited by in corpus (31)

• Stellar obliquities in exoplanetary systems
• A Preponderance of Perpendicular Planets
• DREAM II. The spin-orbit angle distribution of close-in exoplanets under the lens of tides
• GRMHD Simulations of Accreting Neutron Stars with Non-Dipole Fields
• Magnetic angle evolution in accreting neutron stars
• The GRAVITY young stellar object survey -- XI. Probing the inner disk and magnetospheric accretion region of CI Tau
• A CHEOPS-enhanced view of the HD3167 system
• The PFS view of TOI-677 b: A spin-orbit aligned warm Jupiter in a dynamically hot system
• Rossiter-McLaughlin detection of the 9-month period transiting exoplanet HIP41378 d
• Global 3-D Simulations of Magnetospheric Accretion: II. Hot Spots, Equilibrium Torque, Episodic Wind, and Midplane Outflow
• Modelling spin-up episodes in accreting millisecond X-ray pulsars
• Magnetic Inclination Evolution of Accreting Neutron Stars in Intermediate/Low-Mass X-ray Binaries
• Tracking hidden magnetospheric fluctuations in accretion-powered pulsars with a Kalman filter
• ATREIDES I. Embarking on a trek across the exo-Neptunian landscape with the TOI-421 system
• Orbital parameters and activity of ZZ Tau -- a low mass young binary with circumbinary disc
• Assessing the spin-orbit obliquity of low-mass planets in the breaking the chain formation model: A story of misalignment
• TOI-858 B b: A hot Jupiter on a polar orbit in a loose binary
• Kinematical signatures: Distinguishing between warps and radial flows
• Measuring the magnetic dipole moment and magnetospheric fluctuations of SXP 18.3 with a Kalman filter
• Observing Rayleigh-Taylor stable and unstable accretion through a Kalman filter analysis of X-ray pulsars in the Small Magellanic Cloud
• Pre main sequence: Accretion & Outflows
• The High-resolution Accretion Disks of Embedded protoStars (HADES) simulations. I. Impact of Protostellar Magnetic Fields on the Accretion Modes
• The low density, hot Jupiter TOI-640 b is on a polar orbit
• Three-dimensional, Time-dependent MHD Simulation of Disk-Magnetosphere-Stellar Wind Interaction in a T Tauri, Protoplanetary System
• Magnetic precession as a model for QPOs in PULXs: flat-top noise ULXs are different
• The Interplay of Parametric and Magnetorotational Instabilities in Oscillatory Shear Flows
• Warps survive beyond fly-by encounters in protoplanetary disks. RW Aur A as a case study
• On a discontinuity at the base of the transition layer located between the Keplerian accretion disk and the compact object
• A Homogeneous Catalog of Rossiter-McLaughlin Systems: Distinct $e$-$\lambda$ Trends in Three Gas-Giant Mass Regimes
• Orbital alignment of HD 332231 b
• Constraints on the magnetic field structure in accreting compact objects from aperiodic variability