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

We report the discovery of an L dwarf companion to the A3V star \beta{}Circini. VVV J151721.49-585131.5, or \beta{} Cir B, was identified in a propermotion and parallax catalogue of the Vista Variables in the V\'{i}a L\'{a}cteasurvey as having near infrared luminosity and colour indicative of an early Ldwarf, and a proper motion and parallax consistent with that of \beta{} Cir.The projected separation of $\sim$3.6' corresponds to $6656$ au, which isunusually wide. The most recent published estimate of the age of the primarycombined with our own estimate based on newer isochrones yields an age of$370-500$ Myr. The system therefore serves as a useful benchmark at an agegreater than that of the Pleiades brown dwarfs and most other young L dwarfbenchmarks. We have obtained a medium resolution echelle spectrum of thecompanion which indicates a spectral type of L1.0$\pm$0.5 and lacks the typicalsignatures of low surface gravity seen in younger brown dwarfs. This suggeststhat signs of low surface gravity disappear from the spectra of early L dwarfsby an age of $\sim370-500$ Myr, as expected from theoretical isochrones. Themass of \beta{} Cir B is estimated from the BHAC15 isochrones as$0.056\pm0.007$ M$_{\odot}$.

Discovery of a brown dwarf companion to the A3V star \beta{} Circini