This simulation was done with the AMR code Enzo (enzo-project.org/) and analyzed using the yt toolkit for astrophysical data (yt-project.org/).

We see a 3D visualization of roughly 300 years of evolution of a massive and compact protoplanetary disk, containing diatomic hydrogen only. The different colors indicate logarithmic levels of density.

The time evolution shows the formation of large-scale instabilities (spiral arms) and clumps of subjovian mass, which are eventually disintegrated by tidal disruptions in the inner regions.

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