| タイトル | The Minimum-Mass Surface Density of the Solar Nebula using the Disk Evolution Equation |
| 著者（英） | Davis, Sanford S. |
| 著者所属（英） | NASA Ames Research Center |
| 発行日 | 2005-01-01 |
| 言語 | eng |
| 内容記述 | The Hayashi minimum-mass power law representation of the pre-solar nebula (Hayashi 1981, Prog. Theo. Phys.70,35) is revisited using analytic solutions of the disk evolution equation. A new cumulative-planetary-mass-model (an integrated form of the surface density) is shown to predict a smoother surface density compared with methods based on direct estimates of surface density from planetary data. First, a best-fit transcendental function is applied directly to the cumulative planetary mass data with the surface density obtained by direct differentiation. Next a solution to the time-dependent disk evolution equation is parametrically adapted to the planetary data. The latter model indicates a decay rate of r -1/2 in the inner disk followed by a rapid decay which results in a sharper outer boundary than predicted by the minimum mass model. The model is shown to be a good approximation to the finite-size early Solar Nebula and by extension to extra solar protoplanetary disks. |
| NASA分類 | Astrophysics |
| 権利 | No Copyright |
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