Star-Planet Interactions in X-rays

TL;DR

This study analyzed X-ray data of nearby stars with planets to find evidence of star-planet interactions, but found no such interactions at current sensitivity levels, and observed variability only due to stellar rotation.

Contribution

It provides a comprehensive statistical analysis of star-planet interactions in X-rays, showing no detectable effects in the sample and testing a specific system for interaction signatures.

Findings

No evidence of star-planet interactions in the sample

Variability observed is due to stellar rotation

Upsilon Andromedae shows no interaction signatures

Abstract

We investigated the coronal activity of planet-hosting stars by means of statistical analysis for a complete sample of stars in the solar neighborhood. We find no observational evidence that Star-Planet Interactions are at work in this sample, at least not at the sensitivity levels of our observations. We additionally test the upsilon Andromedae system, an F8V star with a Hot Jupiter and two other known planets, for signatures of Star-Planet Interactions in the chromosphere, but only detect variability with the stellar rotation period.