Convection, rotation, and magnetic activity of solar-like stars from asteroseismology

TL;DR

Asteroseismology, enabled by space missions like Kepler and TESS, has revolutionized our understanding of solar-like stars by analyzing their convective background, internal rotation, and magnetic activity through high-precision photometric data.

Contribution

This paper reviews recent advances in understanding stellar convection, rotation, and magnetic activity using asteroseismology, highlighting new insights gained from space-based observations.

Findings

Correlation between convective background and surface gravity.

Detection of internal rotational splittings.

Impact of magnetic activity on mode amplitudes.

Abstract

During the last decade, our understanding of stellar physics and evolution has undergone a tremendous revolution thanks to asteroseismology. Space missions such as CoRoT, \kep, K2, and TESS have already been observing millions of stars providing high-precision photometric data. With these data, it is possible to study the convection of stars through the convective background in the power spectrum density of the light curves. The properties of the convective background or granulation has been shown to be correlated to the surface gravity of the stars. In addition, when we have enough resolution (so long enough observations) and a high signal-to-noise ratio (SNR), the individual modes can be characterized in particular to study the internal rotational splittings and magnetic field of stars. Finally, the surface magnetic activity also impacts the amplitude and hence detection of the acoustic modes. This effect can be seen as a double-edged sword. Indeed, modes can be studied to look for magnetic activity changes. However, this also means that for stars too magnetically active, modes can be suppressed, preventing us from detecting them. In this talk, I will present some highlights on what asteroseismology has allowed us to better understand the convection, rotation, and magnetism of solar-like stars while opening doors to many more questions.