GeminiFocus April 2013 | Page 10

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