Protoplanetary disk

rotating circumstellar disk of dense gas surrounding a young newly formed star

A protoplanetary disk is a rotating circumstellar disc of dense gas and dust surrounding a young star that has just formed. Protoplanetary disks have radii up to 1000 AU. Protoplanetary disks have been seen around several young stars in our galaxy.[1]

Protoplanetary disks are thought to be thin structures. They have mass that is much smaller than the young star in the center.[2]


  1. Ricci, L.; Robberto, M.; Soderblom, D. R. (2008-11-01). "THE HUBBLE SPACE TELESCOPE /ADVANCED CAMERA FOR SURVEYS ATLAS OF PROTOPLANETARY DISKS IN THE GREAT ORION NEBULA". The Astronomical Journal. 136 (5): 2136–2151. doi:10.1088/0004-6256/136/5/2136. ISSN 0004-6256.
  2. Armitage, Philip J. (2011-09-22). "Dynamics of Protoplanetary Disks". Annual Review of Astronomy and Astrophysics. 49 (1): 195–236. doi:10.1146/annurev-astro-081710-102521. ISSN 0066-4146.