The is a open thread discussing a large transectional dimunition of dwarf star system with speculation that this is evidence for alien life. The following study finds a similar system with a spiral shaped ring system.
http://arxiv.org/pdf/1511.02230v1.pdf
http://factor-tech.com/roundup/this-week-super-computers-robot-factories-and-falcon-9-is-blasting-off-again/
What causes asteroid planetoid that has part of its orbit inside the predwarf coronal radius to achieve such an orbit, and then whats there tondisintegrate.
The previous given explanation is that during the red giant state friction drags planets into closer obits, with most being destroyed. So now that these are much closer to the gravitational point mass, that inertia differences between the proximal and distal half of the planet finally tear the planet apart. So this is an explanation.