Core-envelope decoupling drives radial shear dynamos in cool stars
arXiv:2301.07716 · doi:10.3847/2041-8213/acd780
Abstract
Differential rotation is thought to be responsible for the dynamo process in stars like our Sun, driving magnetic activity and star spots. We report that star spot measurements in the Praesepe open cluster are strongly enhanced only for stars which depart from standard models of rotational evolution. A decoupling of the spin down history between the core and envelope explains both the activity and rotation anomalies: surface rotational evolution is stalled by interior angular momentum redistribution, and the resultant radial shears enhance star spot activity. These anomalies provide evidence for an evolving front of shear-enhanced activity affecting the magnetic and rotational evolution of cool stars and the high-energy environments of their planetary companions for hundreds of millions to billions of years on the main sequence.
arXiv comment13 pages, 8 figures. Accepted for publication in ApJ Letters
References in corpus (37)
- emcee: The MCMC Hammer
- The stellar activity-rotation relationship and the evolution of stellar dynamos
- Ages for illustrative field stars using gyrochronology: viability, limitations and errors
- Rotation Periods of 34,030 Kepler Main-Sequence Stars: The Full Autocorrelation Sample
- A Gaia DR2 view of the Open Cluster population in the Milky Way
- Slowing the Spins of Stellar Cores
- The Stellar Populations of Praesepe and Coma Berenices
- Synthetic Stellar Photometry - I. General considerations and new transformations for broad-band systems
- Rotation in the Pleiades with K2: I. Data and First Results
- Improved angular momentum evolution model for solar-like stars II. Exploring the mass dependence
- Fast Star, Slow Star; Old Star, Young Star: Subgiant Rotation as a Population and Stellar Physics Diagnostic
- When Do Stalled Stars Resume Spinning Down? Advancing Gyrochronology with Ruprecht 147
- Rotation of Low-Mass Stars in Upper Scorpius and Rho Ophiuchus with K2
- K2 rotation periods for low-mass Hyads and a quantitative comparison of the distribution of slow rotators in the Hyades and Praesepe
- The Revolution Revolution: magnetic morphology driven spin-down
- Angular Momentum Transport In Solar-Type Stars: Testing the Timescale For Core-Envelope Coupling
- Angular Momentum Transport via Internal Gravity Waves in Evolving Stars
- On the competing effect of wind braking and interior coupling in the rotational evolution of solar-like stars
- The SPOTS Models: A Grid of Theoretical Stellar Evolution Tracks and Isochrones For Testing The Effects of Starspots on Structure and Colors
- Why are the K dwarfs in the Pleiades so Blue?
- A 5D view of the Alpha Per, Pleiades, and Praesepe clusters
- Final Targeting Strategy for the SDSS-IV APOGEE-2N Survey
- Rotation of Late-Type Stars in Praesepe with K2
- The Metallicity of the Pleiades
- Praesepe (NGC 2632) and its tidal tails
- Rotational evolution of slow-rotators sequence stars
- Stellar Rotation in the Gaia Era: Revised Open Clusters Sequences
- Do non-dipolar magnetic fields contribute to spin-down torques?
- Evidence for Metallicity-Dependant Spin Evolution in the Kepler field
- Lithium depletion is a strong test of core-envelope recoupling
- Starspots and Magnetism: Testing the Activity Paradigm in the Pleiades and M67
- Bridging the gap -- the disappearance of the intermediate period gap for fully convective stars, uncovered by new ZTF rotation periods
- Photometric variability as a proxy for magnetic activity and its dependence on metallicity
- Stellar population astrophysics (SPA) with the TNG. Revisiting the metallicity of Praesepe (M44)
- Membership lists for 431 open clusters in Gaia DR2 using extreme deconvolution gaussian mixture models
- HAZMAT. VIII. A Spectroscopic Analysis of the Ultraviolet Evolution of K Stars: Additional Evidence for K Dwarf Rotational Stalling in the First Gigayear
- Spin-down dynamics of magnetized solar-type stars
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- Rotation at the Fully Convective Boundary: Insights from Wide WD + MS Binary Systems
- Signature of spin-down stalling in stellar magnetic activity. The case of the open cluster NGC 6811
- Rotational evolution of young-to-old stars with data-driven three-dimensional wind models
- Towards a holistic magnetic braking model -- II: explaining several long-term internal- and surface-spin properties of solar-like stars and the Sun
- 200,000+ Deep Learning-inferred Periods of Stellar Variability from the All-Sky Automated Survey for Supernovae