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

Transitional discs are a class of circumstellar discs around young stars withextensive clearing of dusty material within their inner regions on 10s of auscales. One of the primary candidates for this kind of clearing is theformation of planet(s) within the disc that then accrete or clear theirimmediate area as they migrate through the disc.  Our sample included eight transitional discs. Using the Keck/NIRC2 instrumentwe utilised the Sparse Aperture Masking (SAM) interferometry technique tosearch for asymmetries indicative of ongoing planet formation. We searched forclose-in companions using both model fitting and interferometric imagereconstruction techniques. Using simulated data, we derived diagnostics thathelped us to distinguish between point sources and extended asymmetric discemission. In addition, we investigated the degeneracy between the contrast andseparation that appear for marginally resolved companions.  We found FP Tau to contain a previously unseen disc wall, and DM Tau, LkHa330, and TW Hya to contain an asymmetric signal indicative of point source-likeemission.  We placed upper limits on the contrast of a companion in RXJ1842.9-3532 andV2246 Oph. We ruled the asymmetry signal in RXJ1615.3-3255 and V2062 Oph to befalse positives.  In the cases where our data indicated a potential companion we computedestimates for the value of $M_c \dot M_c$ and found values in the range of$10^{-5} - 10^{-3} M^2_J yr^{-1}$.  We found significant asymmetries in four targets. Of these, three wereconsistent with companions. We resolved a previously unseen gap in the disc ofFP Tau extending inwards from approximately 10 au.

Search for substellar-mass companions and asymmetries in their parent discs