Locking of the Rotation of Disk-Accreting Magnetized Stars
By M. Long, M. Romanova, R. Lovelace. 2005
141 citations recorded by the source corpus.
We investigate the rotational equilibrium state of disk-accreting magnetized stars using axisymmetric magnetohydrodynamic (MHD) simulations. In this "locked" state, the spin-up torque balances the spin-down torque so that the net average torque on the star is zero. We investigated two types of initial conditions: (I) a relatively weak stellar magnetic field and a high coronal density and (II) a stronger stellar field and a lower coronal density. We observed that for both initial conditions the rotation of the star is locked to the rotation of the disk. In the second case, the radial field lines carry significant angular momentum out of the star. However, this did not appreciably change the condition for locking of the rotation of the star. We find that in the equilibrium state the corotation radius rco is related to the magnetospheric radius rA as rco/rA ≈ 1.2-1.3 for case I and rco/rA ≈ 1.4-1.5 for case II. We estimated periods of rotation in the equilibrium state for classical T Tauri stars, dwarf novae, and X-ray millisecond pulsars.
Subfields: Astronomy and Astrophysics
View Paper: https://www.semanticscholar.org/paper/c2a36f8d2243fc5dac10f5212471be16930b493a
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In Astronomy and Astrophysics
- J. Donati
- M. Romanova
- R. Lovelace
- Alexander V. Koldoba
- G. V. Ustyugova
- C. Johns–Krull
- J. Ferreira
- C. Zanni
Citations in the corpus
- The Magnetic Fields of Classical T Tauri Stars (2007, methodology): “Recently, Long et al. (2005) presented numerical simulations, again assuming an aligned dipole field geometry, with the aim of determining if a time-averaged equilibrium rotation rate is established.”
- MHD simulations of accretion onto a dipolar magnetosphere - II. Magnetospheric ejections and stellar spin-down (2012, result): “The results of the time-dependent axisymmetric simulations by Long et al. (2005) have been recently reexamined, suggesting a valueK = 0.52 (M. Romanova, priv. comm.), in good agreement with our findings.”
- Launching of conical winds and axial jets from the disc–magnetosphere boundary: axisymmetric and 3D simulations (2009, background): “Simulation results of accretion to a star with a dipole field (R02; Long et al. 2005) were recently confirmed by Bessolaz et al. (2008).”
- Magnetospheric accretion on the T Tauri star BP Tauri (2008, background): “As for V2129 Oph, we find that the disc-locking scenario is compatible with observations when the magnetic coupling between the star and its accretion disc is described by models like those of Cameron & Campbell (1993) or Long et al. (2005).”