SpaceTalk: Planet migration in gravitationally unstable planetary disks


The Department of Space and Application (DSA) of University of Science and Technology Hanoi (USTH) invites you to come to our seminar, topic: “Planet migration in gravitationally unstable planetary disks.”
  • Speaker: Ms Nguyen Kim Ngan (BSc: Hanoi National University of Education, MSc & PhD: Hokkaido University, Japan. Postdoc (present): Phenikaa University, Hanoi)
  • Time: Thursday (10/12) at 2:00 pm
  • Place: Room 711, USTH Building (A21), 18B Hoang Quoc Viet, Cau Giay, Hanoi
Spacetalk 2 (1)


According to current theories, proto-planets are formed as a consequence of either a series of collisions and mergers between dust and solid material, or through a collapse from gravitational instabilities in the protoplanetary disk. As the young planet is initially embedded within the protoplanetary disk, interaction with its parent gas disk through the exchange of angular momentum with the surrounding gas can cause the orbital radius of the planet to change, leading to rapid migration towards the star. Such Type I migration  can move a young planet into the star in less than 100,000 years.  However, this calculation assumes the gas disk is homogenous and does  not allow for structures forming within the disk. Heavier disks can  develop spirals and ring instabilities through their own self gravity  that may impact the migration rate of any forming new worlds. In this  research, we use hydrodynamical simulations to model the migration of  small planets through discs that are borderline gravitationally unstable  and see how their motion is affected by disk structure.

We are looking forward to welcoming all those who are interested in attending.