The young star is called HBC 672, and the shadow feature was nicknamed the "Bat Shadow" because it resembles a pair of wings. The nickname turned out to be surprisingly appropriate: Now, the team reports that they see the Bat Shadow flapping!
"The shadow moves. It's flapping like the wings of a bird!" described lead author Klaus Pontoppidan, an astronomer at the Space Telescope Science Institute (STScI) in Baltimore, Maryland. The phenomenon may be caused by a planet pulling on the disk and warping it. The team witnessed the flapping over 404 days.