ASTRO-110 Lecture Notes - Lecture 12: Protoplanetary Disk, Cloud Condensation Nuclei, Lithosphere
Document Summary
Rocks and metals condense, hydrogen compounds stay vaporized. Condensation begins around a condensation nucleus (a microscopic grain of. Rocks and metals condense, hydrogen compounds stay vaporized = in heat. Hydrogen compounds, rocks and metals all condense = low temperatures dust) which facilitates heat loss to condense: Nearest to protstar nothing condenses, then a little of metals condense, then rocks, and far our for hydrogen compounds to condense line beyond which hydrogen compounds condense = frost line the hydrogen/helium never gets cool enough to condense. Then there was accretion: the condensing particles would collide and stick together (accrete). Beyond the frost line: accretion proceeded more rapidly here than within the frost line. With nearly 4 times as much material condensing beyond the frost line, Planetesimals large enough to gather the light gases formed beyond the frost line this was the beginning of the gas giants, or jovian planets.
