Elias 2-27

Elias 2-27 is a young [stellar object|YSO] star with a protoplanetary disk around it, located in the Ophiuchus Molecular Cloud, a star-forming region in the Ophiuchus constellation, some away. This star system became the first ever observed with density waves in the disk, giving it a spiral structure. Elias 2-27 is located near the double star Rho Ophiuchi.

Disk

In 2016, it was discovered that disk perturbations from density waves organized the disk debris into a pinwheel structure, with sweeping spiral arms; using observations from the Atacama Large Millimeter Array radio telescope. This marks the first instance of such an observation in a protoplanetary disk, though they have been previously predicted. The spiral arms start at and extend out to. The disk has a 14 AU wide gap at 69 AU radius with a reduced amount of dust. The disk is very massive at 0.08.