# Constraining the evolution of stellar rotation using solar twins

## TL;DR

This study uses solar twins to refine the understanding of stellar rotation evolution, supporting a smooth rotational evolution model and constraining when magnetic braking weakening might occur in Sun-like stars.

## Contribution

It provides new constraints on stellar rotation evolution using solar twins, favoring a smooth evolution scenario over weakened magnetic braking models.

## Key findings

- Supports smooth rotational evolution scenario
- Weakening of magnetic braking likely occurs after 5.3 Gyr
- Suggests critical Rossby number $Ro_{crit}  2.29$

## Abstract

The stellar Rotation $vs.$ Age relation is commonly considered as a useful tool to derive reliable ages for Sun-like stars. However, in the light of \kepler\ data, the presence of apparently old and fast rotators that do not obey the usual gyrochronology relations led to the hypothesis of weakened magnetic breaking in some stars. In this letter, we constrain the solar rotation evolutionary track using solar twins. Predicted rotational periods as a function of mass, age, [Fe/H] and given critical Rossby number ($Ro_{\rm crit}$) were estimated for the entire rotational sample. Our analysis favors the smooth rotational evolution scenario and suggests that, if the magnetic weakened breaking scenario takes place at all, it should arise after $Ro_{\rm crit}\gtrsim2.29$ or ages $\gtrsim$5.3 Gyr (at 95$\%$ confidence level).