Overwhelming evidence has accumulated in recent years that supernova explosions are
intrinsically three-dimensional phenomena with significant departures from spherical …

We present six epochs of optical spectropolarimetry of the Type II supernova (SN) 2023ixf
ranging from∼ 2 to 15 days after the explosion. Polarimetry was obtained with the Kast …

JCW had long wanted to write a new monograph on supernovae. Despite an immense
explosion in the literature and many review articles, there had not been one since that of …

ABSTRACT A survey of Type II supernovae explosion models has been carried out to
determine how their light curves and spectra vary with their mass, metallicity, and explosion …

Powerful radio jets from active galactic nuclei are thought to be powered by the accretion of
material onto the supermassive black hole (the 'central engine'),. M87 is one of the closest …

We present 645 optical spectra of 73 supernovae (SNe) of Types IIb, Ib, Ic, and broad-lined
Ic. All of these types are attributed to the core collapse of massive stars, with varying degrees …

Core-collapse supernovae are among the most energetic explosions in the universe
marking the catastrophic end of massive stars. In spite of rigorous studies for several …

We investigate the action of the magnetorotational instability (MRI) in the context of iron-core
collapse. Exponential growth of the field on the timescale Ω-1 by the MRI will dominate the …

We present 30 optical spectra and 49 photometric epochs sampling the first 517 days after
discovery of supernova (SN) 1999em and derive its distance through the expanding …

HST images of the young supernova remnant Cas A are used to explore the expansion and
spatial distribution of its highest velocity debris. ACS WFC images taken in 2004 March and …