Spin Evolution of Accreting Young Stars. I. Effect of Magnetic Star-Disk Coupling

Abstract

We present a model for the rotational evolution of a young, solar mass star interacting with an accretion disk. The model incorporates a description of the angular momentum transfer between the star and disk due to a magnetic connection, and includes changes in the star's mass and radius and a decreasing accretion rate. The model also includes, for the first time in a spin evolution model, the opening of the stellar magnetic field lines, as expected to arise from twisting via star-disk differential rotation. In order to isolate the effect that this has on the star-disk interaction torques, we neglect the influence of torques that may arise from open field regions connected to the star or disk. For a range of magnetic field strengths, accretion rates, and initial spin rates, we compute the stellar spin rates of pre-main-sequence stars as they evolve on the Hayashi track to an age of 3~Myr. How much the field opening affects the spin depends on the strength of the coupling of the magnetic field to the disk. For the relatively strong coupling (i.e., high magnetic Reynolds number) expected in real systems, all models predict spin periods of less than $\sim 3$ days, in the age range of 1--3~Myr. Furthermore, these systems typically do not reach an equilibrium spin rate within 3~Myr, so that the spin at any given time depends upon the choice of initial spin rate. This corroborates earlier suggestions that, in order to explain the full range of observed rotation periods of approximately $1$--$10$ days, additional processes, such as the angular momentum loss from powerful stellar winds, are necessary.

References in corpus (20)

• The Magnetic Fields of Classical T Tauri Stars
• Accretion in the Rho-Oph pre-main sequence stars
• Simulations of dynamo action in fully convective stars
• Probing T Tauri Accretion and Outflow with 1 Micron Spectroscopy
• Launching of Conical Winds and Axial Jets from the Disk-Magnetosphere Boundary: Axisymmetric and 3D Simulations
• On the formation of H-alpha line emission around classical T Tauri stars
• Magnetospheric accretion on the T Tauri star BP Tauri
• Magnetic fields and accretion flows on the classical T Tauri star V2129 Oph
• Accretion-Powered Stellar Winds II: Numerical Solutions for Stellar Wind Torques
• Accretion funnels onto weakly magnetized young stars
• A Correlation Between Pre-Main Sequence Stellar Rotation Rates and IRAC Excesses in Orion
• Modeling T Tauri Winds from He I 10830 Profiles
• The Monitor project: Rotation of low-mass stars in NGC 2362 -- testing the disc regulation paradigm at 5 Myr
• Turbulence-driven Polar Winds from T Tauri Stars Energized by Magnetospheric Accretion
• Accretion-Powered Stellar Winds III: Spin Equilibrium Solutions
• Magnetocentrifugally Driven Flows from Young Stars and Disks. VI. Accretion with a Multipole Stellar Field
• The non-dipolar magnetic fields of accreting T Tauri stars
• Rotation and activity of pre-main-sequence stars
• Spectropolarimetry of the Classical T Tauri Star TW Hydrae
• First Magnetic Field Detection on a Class I Protostar

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• Nonradial and nonpolytropic astrophysical outflows IX. Modeling T Tauri jets with a low mass-accretion rate
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• Time-dependent, long-term hydrodynamic simulations of the inner protoplanetary disk I: The importance of stellar magnetic torques
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• Time-dependent, long-term hydrodynamic simulations of the inner protoplanetary disk II: The importance of stellar rotation
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