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 Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Gliese 569B is a multiple brown dwarf system whose exact nature has been thesubject of several investigations over the past few years. Interpretation haspartially relied on infra-red photometry and spectroscopy of the resolvedcomponents of the system. We present seeing limited Ks photometry over fournights, searching for variability in this young low mass substellar system. Ourphotometry is consistent with other reported photometry, and we report thetentative detection of several periodic signals consistent with rotationalmodulation due to spots on their surfaces. The five significant periods rangefrom 2.90 hours to 12.8 hours with peak to peak variabilities from 28 mmag to62 mmag in the Ks band.  If both components are rotating with the shortest periods, then theirrotation axes are not parallel with each other, and the rotation axis of the Bbcomponent is not perpendicular to the Ba-Bb orbital plane. If Bb has one of thelonger rotational periods, then the Bb rotation axis is consistent with beingparallel to the orbital axis of the Ba-Bb system.

Infrared Variability of the Gliese 569B System