Soon after a giant planet forms, its gravity sweeps out a ring - shaped gap in the disk. (discovermagazine.com)
Recent ALMA observations revealed multiple gaps in the disk. (sciencedaily.com)
«Discovery of a Giant Gap in the Disk of a Sun - like Star May Indicate Multiple Planets» «Diversity the Norm in Protoplanetary Disks: Astronomers Find Donuts, Spirals and Now Banana Splits» (alma-telescope.jp)