Dr Stuart Ryder (AAO)

Supernova 2001ig: The Missing Link? - Dr Stuart Ryder Colloquium

ATNF Marsfield Lecture Theatre

Abstract

Over the past 2 years, we have been monitoring the radio evolution
of Supernova 2001ig with the ATCA. SN 2001ig is one of the rare class
of "Type IIb" supernovae, which mysteriously change from a Type II
(H-rich) to a Type Ib/c (H-poor) supernova. The radio light curve of
SN 2001ig shows an intriguing periodicity, which we argue can be explained
by the colliding stellar winds of a Wolf-Rayet progenitor star and a hot
companion on an eccentric orbit. Our ATCA observations may thus provide
the key to linking Wolf-Rayet stars, Type Ib/c and Type IIb supernovae,
and even some types of gamma-ray bursts.