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 new 0.6 - 4 $\mu$m imaging of the SR 21 transition disk fromKeck/NIRC2 and Magellan/MagAO. The protoplanetary disk around SR 21 has a large(~ 30 - 40 AU) clearing first inferred from its spectral energy distributionand later detected in sub-millimeter imaging. Both the gas and small dustgrains are known to have a different morphology, with an inner truncation in COat ~7 AU, and micron-sized dust detected within the millimeter clearing.Previous near-infrared imaging could not distinguish between an inner dust diskwith a truncation at ~7 AU or one that extended to the sublimation radius. Theimaging data presented here require an inner dust disk radius of a few AU, andcomplex structure such as a warp or spiral. We present a parametric warped diskmodel that can reproduce the observations. Reconciling the images with thespectral energy distribution gathered from the literature suggests grain growthto ~2 - 5 $\mu$m within the sub-millimeter clearing. The complex disk structureand possible grain growth can be connected to dynamical shaping by agiant-planet mass companion, a scenario supported by previous observational andtheoretical studies.

New Spatially Resolved Imaging of the SR 21 Transition Disk and Constraints on the Small-Grain Disk Geometry