Time-domain Modulation of HD 189733 Activities by Its Planet

Star-planet interaction can be studied by analyzing exoplanetary orbit and stellar rotation modulations of the transit emissions from exoplanetary systems. Here we carry out a time-domain analysis of the multiband activities of the HD 189733 star-planet system observed in X-ray, atomic lines, and broadband spectra reported in the literature. We find that the number of activities occuring at beat angles (of the planetary orbit and the stellar rotation) concentrating on a sector with a width of 108 degrees are significantly larger than expected from a uniform distribution of activities, which indicates the existence of a major stellar active magnetic field region. The concentration of activities in this active magnetic field region shows their possible origins from the magnetic field interaction between HD 189733 and its close planet HD 189733 b.

Automated summary

The time-domain analysis of activities in the HD 189733 star-planet system reveals a concentration of activities in a sector with a width of 108 degrees, indicating the presence of a major stellar active magnetic field region possibly originating from the magnetic field interaction between HD 189733 and its close planet HD 189733 b.