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A Supernova Riddle
Douglas C. Leonard
Analysis of the polarization of light from supernovae can reveal the shape and distribution of matter ejected from exploding stars. Here we review the young field of Type Ia supern…
Constraining the Type Ia Supernova Progenitor: The Search for Hydrogen in Nebular Spectra
Douglas C. Leonard
Despite intense scrutiny, the progenitor system(s) that gives rise to Type Ia supernovae remains unknown. The favored theory invokes a carbon-oxygen white dwarf accreting hydrogen-…
The Dual-Axis Circumstellar Environment of the Type IIn Supernova 1997eg
Jennifer L. Hoffman, Douglas C. Leonard, Ryan Chornock +3
We present multi-epoch spectral and spectropolarimetric observations of the Type IIn supernova (SN) 1997eg that indicate the presence of a flattened disk-like concentration of circ…
Detection of circumstellar material in a normal Type Ia Supernova
F. Patat, P. Chandra, R. Chevalier +19
Type Ia supernovae are thought to be thermonuclear explosions of accreting white dwarfs that reach a critical mass limit. Despite their importance as cosmological distance indicato…