English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

HD 181068 is the only compact, triply eclipsing, hierarchical triple systemcontaining a giant star known to date. With its central, highly-active G-typegiant orbited by a close pair of main-sequence dwarfs, the system is ideal tostudy tidal interactions. We carried out a multiwavelength study tocharacterize the magnetic activity of the HD 181068 system. To this end, weobtained in- and out-of-eclipse X-ray snapshots with XMM-Newton and an opticalspectrum, which we analyzed along with the Kepler light-curve. The primarygiant shows strong quiescent X-ray emission at a level of 2e31 ergs, an S-indexof 0.41 +/- 0.01, and marked white-light flares releasing up to 6e38 erg in theKepler-band. During the second X-ray observation, we found a three-timeselevated -- yet decaying -- level of X-ray emission, which might be due to anX-ray flare. The high level of magnetic activity is compatible with thepreviously reported absence of solar-like oscillations in the giant, whoseatmosphere, however, undergoes tidally-induced oscillations imposed by thechanging configuration of the dwarf-binary. We found that the driving forceexciting these oscillations is comparable to the disturbances produced by atypical hot Jupiter, making the system a potential test bed to study theeffects of tidal interactions also present in planetary systems.

A multiwavelength study of the hierarchical triple HD 181068: A test bed for studying star-planet-interaction?