Upgrading the Solar-Stellar Connection: News about activity in Cool Stars

TL;DR

This paper summarizes recent theoretical and observational advances in understanding solar and stellar activity, highlighting their interconnectedness and the implications for modeling stellar magnetic phenomena and activity-related variability.

Contribution

It presents new insights into mass accretion, magnetic field evolution, and radial-velocity jitter modeling, expanding the parameter space of stellar activity models.

Findings

New observational results on stellar activity rates

Models of radial-velocity jitter due to granulation

Evolution of stellar magnetic fields over stellar lifetimes

Abstract

In this splinter session, ten speakers presented results on solar and stellar activity and how the two fields are connected. This was followed by a lively discussion and supplemented by short, one-minute highlight talks. The talks presented new theoretical and observational results on mass accretion on the Sun, the activity rate of flare stars, the evolution of the stellar magnetic field on time scales of a single cycle and over the lifetime of a star, and two different approaches to model the radial-velocity jitter in cool stars that is due to the granulation on the surface. Talks and discussion showed how much the interpretation of stellar activity data relies on the sun and how the large number of objects available in stellar studies can extend the parameter range of activity models.