Spirals and vortices in HD135344B* : evidence for triggered planet formation?

<p>In recent years spiral structures and vortices (potentially signs of planets) are seen in disks. I present ALMA mm-data of the HD135344B disk, revealing that the dust disk in fact consists of a ring and an asymmetry. This can be understood as triggered formation of a secondary vortex by a planet at 30 AU. The 2 spiral arms seen in PDI are fit to originate from that same planet and from the vortex.</p> <p>