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 Tools annual

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 monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

The disk surrounding SAO 206462, an 8 Myr-old Herbig Ae star, has recentlybeen reported to exhibit spiral arms, an asymmetric dust continuum, and adust-depleted inner cavity. By carrying out two-dimensional, two-fluidhydrodynamic calculations, we find that a planetary-mass companion located atthe outer disk could be responsible for these observed structures. In thismodel, the planet excites primary and secondary arms interior to its orbit. Italso carves a gap and generates a local pressure bump at the inner gap edgewhere a vortex forms through Rossby wave instability. The vortex traps radiallydrifting dust particles, forming a dust-depleted cavity in the inner disk. Wepropose that the vortex is responsible for the brightest southwestern peak seenin infrared scattered light and sub-millimeter dust continuum emission. Inparticular, it is possible that the scattered light is boosted as one of thespiral arms passes through the high density vortex region, although the vortexalone may be able to explain the peak. We suggest that a planetary companionwith a mass of 10-15 M_J is orbiting SAO 206462 at 100-120 au. Monitoring ofthe brightest peak over the next few years will help reveal its origin becausethe spiral arms and vortex will show distinguishable displacement.

Planetary Signatures in the SAO 206462 (HD 135344B) Disk: A Spiral Arm Passing Through Vortex?