twin disks have very different properties

Astronomers in Korea and Japan observed both gaseous and solid material in a pair of protostellar disks and found that the twin disks have very different properties
Minho's Astronomy Image Gallery
"There are two protostars, NGC 1333 IRAS 4A1/2, at the center of the new radio images. Among them, A1 is brighter in the radio emission from interstellar dust while A2 is brighter in the emission from molecular gas. A1 and A2 are located in a single molecular cloud. That is, they are twin baby stars being made in a single mother body. "

http://minho.kasi.re.kr/ImageGallery/200709.NGC1333-4NH3/

ガス円盤と塵円盤を伴う双子の原始星の発見

http://alma.mtk.nao.ac.jp/~kt/ktpress.html