Kelly Lepo (kellylepo@astrodon.social)'s status on Saturday, 02-Sep-2023 07:07:33 JST

@morganism The hourglass-shaped rings (and the inner ring) are from material previously ejected from the star, that glow because they were ionized by ultraviolet and X-ray light from the supernova explosion.

A proposed formation mechanism comes from binary interactions: https://hubblesite.org/contents/media/images/2007/10/2063-Image.html