Potential Vorticity Evolution in the Co-orbital Region of Embedded Protoplanets Metadata

Metadata describes a digital item, providing (if known) such information as creator, publisher, contents, size, relationship to other resources, and more. Metadata may also contain "preservation" components that help us to maintain the integrity of digital files over time.


  • Main Title Potential Vorticity Evolution in the Co-orbital Region of Embedded Protoplanets


  • Author: Koller, J.
    Creator Type: Personal


  • Sponsor: United States. Department of Energy.
    Contributor Type: Organization
    Contributor Info: US DOE (United States)


  • Name: Los Alamos National Laboratory
    Place of Publication: Los Alamos, New Mexico
    Additional Info: Los Alamos National Lab., Los Alamos, NM (United States)


  • Creation: 2004-09-01


  • English


  • Content Description: This thesis presents two-dimensional hydrodynamic disk simulations with embedded protoplanets, emphasizing the non-linear dynamics in the co-orbital region. In particular, it demonstrates how a protoplanetary disk responds to embedded low mass planets at the inviscid limit. Since the potential vorticity (PV) flow is not conserved, due to the spiral shocks and possibly boundary layer effects emanating from the planet, the PV profile develops inflection points which eventually render the flow unstable. Vortices are produced in association with the potential vorticity minima. Born in the separatrix region, these vortices experience close encounters with the planet, consequently exerting strong torques on the planet. The existence of these vortices, if confirmed, have important implications on planetary migration rates. The formation of vortices is discussed in more detail and a key parameter is found which depends solely on planet mass and sound speed. With this key parameter, one can predict the disk evolution, PV growth rates, and threshold conditions for forming vortices in the co-orbital region. An analytical estimate for the change of PV due to shocks is compared to the actual change in PV in the hydrodynamic simulations. They match well except in the inner region where vortices form. In addition, extensive resolution tests were carried out but uncertainties remain about the physics of this particular region.
  • Physical Description: 175 pages


  • STI Subject Categories: 71 Classical And Quantum Mechanics, General Physics
  • STI Subject Categories: 75 Condensed Matter Physics, Superconductivity And Superfluidity
  • Keyword: Vortices 75 Condensed Matter Physics, Superconductivity And Superfluidity
  • Keyword: Physics
  • Keyword: Hydrodynamics
  • Keyword: Velocity
  • Keyword: Planets
  • Keyword: Protoplanets
  • Keyword: Boundary Layers
  • Keyword: Resolution


  • Other Information: TH: Thesis (Ph.D.); Submitted to the Department of Physics and Astronomy, Rice University, Houston, TX (US)


  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI


  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Thesis or Dissertation


  • Text


  • Report No.: LA-14149-T
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 836124
  • Archival Resource Key: ark:/67531/metadc779530


  • Display Note: INIS; OSTI as DE00836124