Informal lunch talk at Columbia on the year's transient discoveries: constraints on the progenitor of the nearby Type Ia supernova SN 2011fe and the relativistic tidal disruption events Swift J1644+57 and J2058+05.
Columbia astronomy's informal Tuesday pizza lunch (a short talk, then a long discussion), two hours before his AMNH seminar. The slides cover the progenitor limits on SN 2011fe and the jetted tidal disruption events Swift J1644+57 and J2058+05.