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Transition disks are considered sites of ongoing planet formation, and theirdust and gas distributions could be signposts of embedded planets. Thetransition disk around the T Tauri star RY Lup has an inner dust cavity anddisplays a strong silicate emission feature. Using high-resolution imaging westudy the disk geometry, including non-axisymmetric features, and its surfacedust grain, to gain a better understanding of the disk evolutionary process.Moreover, we search for companion candidates, possibly connected to the disk.We obtained high-contrast and high angular resolution data in the near-infraredwith the VLT/SPHERE extreme adaptive optics instrument whose goal is to studythe planet formation by detecting and characterizing these planets and theirformation environments through direct imaging. We performed polarimetricimaging of the RY~Lup disk with IRDIS (at 1.6 microns), and obtained intensityimages with the IRDIS dual-band imaging camera simultaneously with the IFSspectro-imager (0.9-1.3 microns). We resolved for the first time the scatteredlight from the nearly edge-on circumstellar disk around RY~Lup, at projectedseparations in the 100 \,au range. The shape of the disk and its sharp featuresare clearly detectable at wavelengths ranging from 0.9 to 1.6 microns. We showthat the observed morphology can be interpreted as spiral arms in the disk.This interpretation is supported by in-depth numerical simulations. We alsodemonstrate that these features can be produced by one planet interacting withthe disk. We also detect several point sources which are classified as probablebackground objects.

First scattered light detection of a nearly edge-on transition disk around the T Tauri star RY Lup