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

We present the first ALMA observations of the closest known extrasolar debrisdisc. This disc orbits the star $\epsilon$ Eridani, a K-type star just 3.2pcaway. Due to the proximity of the star, the entire disc cannot fit within theALMA field of view. Therefore, the observations have been centred 18" North ofthe star, providing us with a clear detection of the northern arc of the ring,at a wavelength of 1.3mm. The observed disc emission is found to be narrow witha width of just 11-13AU. The fractional disc width we find is comparable tothat of the Solar System's Kuiper Belt and makes this one of the narrowestdebris discs known. If the inner and outer edges are due to resonances with aplanet then this planet likely has a semi-major axis of 48AU. We find tentativeevidence for clumps in the ring, although there is a strong chance that atleast one is a background galaxy. We confirm, at much higher significance, theprevious detection of an unresolved emission at the star that is above thelevel of the photosphere and attribute this excess to stellar chromosphericemission.

The Northern Arc of $\epsilon$ Eridani's Debris Ring as Seen by ALMA