Outward transport of high-temperature materials around the midplane of the solar nebula.

Two-Dimensional Transport of Solids in Viscous Protoplanetary Disks

Large-scale radial transport of solids appears to be a fundamental consequence of protoplanetary disk evolution based on the presence of high temperature minerals in comets and the outer regions of protoplanetary disks around other stars. Further, inward transport of solids from the outer regions of the solar nebula has been postulated to be the manner in which short-lived radionuclides were in...

Evolution of the Solar Nebula. VIII. Spatial and Temporal Heterogeneity of Short-Lived Radioisotopes and Stable Oxygen Isotopes

Isotopic abundances of short-lived radionuclides such as Al provide the most precise chronometers of events in the early solar system, provided that they were initially homogeneously distributed. On the other hand, the abundances of the three stable isotopes of oxygen in primitive meteorites show a mass-independent fractionation that survived homogenization in the solar nebula. As as result of ...

Radial Transport of High Temperature Materials in the Solar Nebula: Applications to Stardust

Photophoresis as a Source of Crystalline Silicates in Comets

Introduction: Crystalline silicates have been detected in a growing number of comets [1] [2] [3]. Since these bodies are presumed to be formed in the cold outer part of the solar nebula, several processes have been invoked in order to explain the origin of their crystalline silicates. It has been suggested that shock waves in the outer solar nebula could anneal the amorphous silicates to crysta...

Solar Nebula Magnetohydrodynamic Dynamos" Kinematic Theory, Dynamical Constraints, and Magnetic Transport of Angular Momentum

A hydromagnetic dynamo provides the best mechanism for contemporaneously producing magnetic fields in a turbulent solar nebula. We investigate the solar nebula in the framework of a steady-state accretion disk model and establish the criteria for a viable nebular dynamo. We have found that typically a magnetic gap exists in the nebula, the region where the degree of ionization is too small for ...