Wyniki wyszukiwania - BazTech

1

Hot Jupiters and Central Cavities of Protoplanetary Disks

Starczewski S., Gawryszczak A. J., Wönsch R., Różyczka M.

Acta Astronomica

|

2007

|

Vol. 57, No. 2

123--138

EN

We investigate numerically the orbital evolution of massive extrasolar planets within central cavities of their parent protoplanetary disks. Assuming that they arrive at the inner edge of the disk due to type II migration, we show that they spiral further in. We find that in magnetospheric cavities more massive planets stop migrating at a larger distance from the edge of the disk. This effect may qualitatively explain the correlation between masses and orbital periods found for massive planets with P shorter than 5 days.

2

Doppler Tomograms from Hydrodynamical Models of Dwarf Nova Disks

Gawryszczak A. J., Różyczka M.

Acta Astronomica

|

2003

|

Vol. 53, No. 1

73--83

EN

We present three-dimensional models of accretion disks in U Gem-like systems and calculate their Doppler tomograms. The tomograms are based on two different assumptions concerning the origin of line emission from the disk. The assumption of lines originating due to irradiation of the surface layer of the disk by the central source leads to a better agreement with observations. We argue that fully three-dimensional modeling is necessary to properly interpret the observed tomograms.

3

Hydrodynamical Models of Accretion Disks in SU UMa Systems

Kornet K., Różyczka M.

Acta Astronomica

|

2000

|

Vol. 50, No. 2

163--175

EN

We numerically test the mode-coupling model (Lubow 1991a) of tidal instability in SU UMa systems. So far, all numerical models confirming it have been based on SPH codes and isothermal equation of state. In our paper we present Eulerian models, using both isothermal approximation and the full energy equation. We also investigate influence of different ways of mass transfer. While isothermal models behave similarly to SPH simulations, the behavior of models with full energy equation is quite different, and the mode-coupling model is not confirmed in this case.

4

2D Simulations of Stellar Convection. II. A Study of the Dependence of the Results on Numerical Methods

Kiraga M., Różyczka M., Stępień K., Jahn K., Muthsam H.

Acta Astronomica

|

2000

|

Vol. 50, No. 1

93--104

EN

Models of a 2-D convectively unstable layer placed between two stable layers are obtained using two independent numerical codes. Penetration ranges and mechanical energy fluxes carried by internal gravity waves are measured for several models with different global parameters. It is shown that both codes produce statistically identical results, which makes them reliable tools for investigations of stellar convection.