# How stars and planets interact: a look through the high-energy window

## TL;DR

This paper reviews how close-in exoplanets and their host stars interact through tidal and magnetic effects, emphasizing high-energy observational opportunities and current evidence for such star-planet interactions.

## Contribution

It provides a comprehensive overview of theoretical interaction mechanisms and discusses observational prospects and evidence in the high-energy regime.

## Key findings

- Potential for star-planet magnetic interactions observed in high-energy data
- Evidence of planetary atmospheric evaporation due to stellar influence
- Observational strategies for detecting star-planet interactions in X-ray and UV

## Abstract

The architecture of exoplanetary systems is often different from the solar system, with some exoplanets being in close orbits around their host stars and having orbital periods of only a few days. In analogy to interactions between stars in close binary systems, one may expect interactions between the star and the exoplanet as well. From theoretical considerations, effects on the host star through tidal and magnetic interaction with the exoplanet are possible; for the exoplanet, some interesting implications are the evaporation of the planetary atmosphere and potential effects on the planetary magnetism. In this review, several possible interaction pathways and their observational prospects and existing evidence are discussed. A particular emphasis is put on observational opportunities for these kinds of effects in the high-energy regime.