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Spiral arms in scattered light images of protoplanetary discs: are they the signposts of planets?

Spiral arms in scattered light images of protoplanetary discs: are they the signposts of planets?

One of the striking discoveries of protoplanetary disc research in recent years are the spiral arms seen in several transitional discs in polarized scattered light.An interesting interpretation of the observed spiral features is that they are density waves launched by one or more embedded (proto)planets in the disc.In this paper, …