Althea Moorhead Graduate Student Research Assistant Office: 3247 Randall Education: University of Michigan, Ann Arbor,   2003 - present University of Arizona, B.S. 2003 Research Field: Astrophysics Theory Adviser: Fred Adams Research Focus: Planetary Migration Research Description:

In the past decade, over 150 planets have been discovered outside of our solar system. These solar systems have very different properties from our own, prompting the development of new theories about solar system formation and evolution. For instance, the discovered planets are very massive, comparable to Jupiter in size, yet live in orbits around their host stars that are tinier than Mercury's. Due to the very hot temperatures encountered at these short distances from stars, it is unlikely that such massive planets are able to form in situ. Instead, we think that these planets form at large radii, and then are shoved inward through friction with a circumstellar disk of dust and gas. Explaining just how the hydrodynamics of the disk affects the planet is a rich and complex problem, and lies at the heart of my research on orbit evolution.