of 56Ni in the southern hemisphere as the
cause. The decay of 56Ni produces much of
the supernova’s light and determines the
shape of the light curve.
Figure 3.
Ha profiles observed
(black) and modeled
(red; assuming an
isotropic source).
Residual error is
plotted in blue, and
spectra are offset for
clarity. Regions of
poor sky subtraction
are not plotted.
In addition, the small-scale features (the
knees) require some asymmetric emission,
which may be related to the “Bochum event”
— a transient spectral feature that lasted for
only a few weeks, some three months after
the supernova event. This wou