Transition of latitudinal differential rotation as a possible cause of weakened magnetic braking of solar-type stars

Abstract

We investigate the role of latitudinal differential rotation (DR) in the spin evolution of solar-type stars. Recent asteroseismic observation detected the strong equator-fast DR in some solar-type stars. Numerical simulations show that the strong equator-fast DR is a typical feature of young fast-rotating stars and that this tendency is gradually reduced with stellar age. Incorporating these properties, we develop a model for the long-term evolution of stellar rotation. The magnetic braking is assumed to be regulated dominantly by the rotation rate in the low-latitude region. Therefore, in our model, stars with the equator-fast DR spin down more efficiently than those with the rigid-body rotation. We calculate the evolution of stellar rotation in ranges of stellar mass, $0.9{\mathrm{M}}_{\odot }\le M\le 1.2{\mathrm{M}}_{\odot }$, and metallicity, $0.5{\mathrm{Z}}_{\odot }\le Z\le 2{\mathrm{Z}}_{\odot }$, where ${\mathrm{M}}_{\odot }$ and ${\mathrm{Z}}_{\odot }$ are the solar mass and metallicity, respectively. Our model, using the observed torque in the present solar wind, nicely explains both the current solar rotation and the average trend of the rotation of solar-type stars, including the dependence on metallicity. In addition, our model naturally reproduces the observed trend of the weakened magnetic braking in old slowly rotating solar-type stars because strong equator-fast DR becomes reduced. Our results indicate that LDR and its transition are essential factors that control the stellar spin down.

20 pages, 16 figures, 3 table, accepted to MNRAS

References in corpus (40)

• Modules for Experiments in Stellar Astrophysics (MESA)
• Modules for Experiments in Stellar Astrophysics (MESA): Pulsating Variable Stars, Rotation, Convective Boundaries, and Energy Conservation
• Measuring the rotation period distribution of field M-dwarfs with Kepler
• Stellar magnetism: empirical trends with age and rotation
• Standing on the shoulders of Dwarfs: the Kepler asteroseismic LEGACY sample II - radii, masses, and ages
• The Mass-Dependence of Angular Momentum Evolution in Sun-Like Stars
• The active lives of stars: a complete description of rotation and XUV evolution of F, G, K, and M dwarfs
• Stellar Winds on the Main-Sequence II: the Evolution of Rotation and Winds
• Calibrating Gyrochronology using Kepler Asteroseismic targets
• Asteroseismic measurement of slow, nearly-uniform surface-to-core rotation in the main sequence F star KIC 9244992
• Asteroseismology of solar-type stars
• The evolution of the solar wind
• High-resolution calculation of the solar global convection with the reduced speed of sound technique: II. Near surface shear layer with the rotation
• Reconciling solar and stellar magnetic cycles with nonlinear dynamo simulations
• Weakened magnetic braking supported by asteroseismic rotation rates of Kepler dwarfs
• Reynolds stress and heat flux in spherical shell convection
• Estimating magnetic filling factors from Zeeman-Doppler magnetograms
• Accretion-Powered Stellar Winds III: Spin Equilibrium Solutions
• Powering Stellar Magnetism: Energy Transfers in Cyclic Dynamos of Sun-like Stars
• The Impact of Metallicity on the Evolution of Rotation and Magnetic Activity of Sun-Like Stars
• The BAyesian STellar Algorithm (BASTA): a fitting tool for stellar studies, asteroseismology, exoplanets, and Galactic archaeology
• Age dependence of wind properties for solar type stars: a 3d study
• Solar differential rotation reproduced with high-resolution simulation
• Generation solar-like differential rotation
• Radio emission and mass loss rate limits of four young solar-type stars
• The Origin of Weakened Magnetic Braking in Old Solar Analogs
• On rising magnetic flux tube and formation of sunspots in a deep domain
• Alfvén-wave driven magnetic rotator winds from low-mass stars I: rotation dependences of magnetic braking and mass-loss rate
• Photometric variability as a proxy for magnetic activity and its dependence on metallicity
• Temporal Evolution of Spatially-Resolved Individual Star Spots on a Planet-Hosting Solar-type Star: Kepler 17
• Latitudinal differential rotation in the solar analogues 16 Cyg A and B
• Direct Detection of Solar Angular Momentum Loss with the Wind Spacecraft
• Shape of a slowly rotating star measured by asteroseismology
• Universal Scaling Laws for Solar and Stellar Atmospheric Heating: Catalog of Power-law Index between Solar Activity Proxies and Various Spectral Irradiances
• Inferring the Rotation Period Distribution of Stars from their Projected Rotation Velocities and Radii: Application to late-F/early-G Kepler Stars
• The Solar Wind Angular Momentum Flux as Observed by Parker Solar Probe
• On the Evolution of Rotational Modulation Amplitude in Solar-mass Main-sequence Stars
• Meta-analysis of photometric and asteroseismic measurements of stellar rotation periods: the Lomb-Scargle periodogram, autocorrelation function, wavelet and rotational splitting analysis for 92 Kepler asteroseismic targets
• Asteroid Magnetization from the Early Solar Wind
• Effect of Differential Rotation on Magnetic Braking of Low-Mass and Solar-Like Stars: A Proof-of-Concept Study

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