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作者 Michael, Scott
書名 Planet migration induced by gravitational instabilities
國際標準書號 9781124662367
book jacket
說明 208 p
附註 Source: Dissertation Abstracts International, Volume: 72-08, Section: B, page: 4710
Adviser: Richard H. Durisen
Thesis (Ph.D.)--Indiana University, 2011
The study of gravitational instabilities (GIs) and their effects on protoplanetary disks has been an area of active research for over a decade. Although some studies have indicated that GIs cannot form gas giant planets directly, it is clear that they can have a significant effect on protoplanetary disk evolution. In this dissertation, I present several areas where GIs may play a key role in the evolution of a protoplanetary disk. These studies are carried out using three dimensional numerical simulations. I have carried out and analyzed twenty simulations with varying initial conditions, resolutions, and physical effects. Although all indications from these simulations are that GIs cannot form gas giant planets directly at radii smaller than 40 AU, they have shown that GIs can have a dramatic effect on protoplanetary disk structure and planets embedded in a protoplanetary disk
I present several key results including: the effects of a varied initial surface density profile, azimuthal resolution, the amplitude of the initial random perturbation, and the adiabatic index used on the onset, strength and general evolution of GIs in protoplanetary disks. Additionally, I give results from studies of the interaction of the instabilities with the central star when it is allowed to move freely in response to the action of the GIs. Finally, I expound on several results regarding the interaction of embedded massive planets and GI active disks. I find that the presence of massive planets can have a dramatic effect on the evolution of GIs in an active disk, and the GIs can also dramatically effect the migration of the embedded planet. In fact, the action of the GIs may cause planets to migrate outward, contrary to the standard theory of the planet migration in laminar disks
School code: 0093
Host Item Dissertation Abstracts International 72-08B
主題 Physics, Astrophysics
Alt Author Indiana University. Astronomy
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