| タイトル | Following the Water: the Evolution of Ice-forming Regions in the Early Solar Nebula |
| 著者（英） | Davis, Sanford S. |
| 著者所属（英） | NASA Ames Research Center |
| 発行日 | 2006-01-01 |
| 言語 | eng |
| 内容記述 | The abundances of water-vapor and water-ice during the first ten million years of the protoplanetary solar nebula are simulated using a new condensation/sublimation model. This study builds on a "snow line" model reported in ApJ 627 L153 (2005); it uses a simple phenomenological model where water vapor molecules evolve from solar atomic abundance and eventually condenses to ice at colder points in the nebula once the water-vapor partial pressure exceeds a value determined by the phase diagram for water. The synthesis of water vapor from elementary species is modeled with a chemical network consisting of about 400 species and 4000 reactions. The evolution of the icy zone (and its relative abundance of solid ice) is traced from a limited region in the early hotter disk to its final state at the time when the gas is expelled and a planetary system begins to form. Possible effects of this dynamic motion on disk chemistry and organic molecule formation are also described. |
| NASA分類 | Astrophysics |
| 権利 | No Copyright |
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