The Observer’s Guide to the Gamma-Ray Burst Supernova Connection

Figure 11

Observed [O I] 6300,6364 emission-line profiles for a sample of SNe Ibc. Top right: emission lines classified into characteristic profiles (from [222]): single-peaked (S), transition (T), and double-peaked (D). Model predictions from a bipolar model (red curves) and a less aspherical model (blue), for different viewing directions are shown (directions denoted by the red and blue text). All other panels: nebular line profiles observed for an aspherical explosion model for different viewing angles (from [113]). The figure shows the properties of the explosion model: Fe (coloured in green and blue) is ejected near the jet direction and oxygen (red) in a torus-like structure near the equatorial plane. Synthetic [O I] 6300,6364 emission-line profiles are compared with the spectra of SN 1998bw (top left) and SN 2003jd (bottom right).