Astrophysics Seminars

ABSTRACT: I will review our present understanding of super-Eddington atmospheres, as borne from theory and observations. In particular, I will show how atmospheres can sustain super-Eddington fluxes, while accelerating only ``moderate'' mass loss...

ABSTRACT: The 20th Century has seen a notable temperature rise, generally attributed to the greenhouse effect of anthropogenic gases, and a future "business as usual" policy is generally believed to be catastrophic. I will show, however, that the...

ABSTRACT: Recent observations have shown that in many exoplanetary systems, the spin axis of the parent star is misaligned with the angular momentum axis of the planet's orbit. This is unexpected as planets are formed in protostellar disks which are...

ABSTRACT: High speed impacts of large bodies on Earth launch ejecta on trajectories that transport them thousands of kilometers from the impact site. These events are recorded in discrete layers of sub-millimeter size spherules in sea floor...