![Figure 16](kasen_f2-f3.png)
Figure 16: Upper panel: model light curve of a SN Ia having collided with a red giant companion
separated by
. The luminosity due to the collision is prominent at times
days.
The black dashed line shows the analytic prediction for the early phase luminosity. Lower panel:
Signatures of interaction in the early broadband light curves of SN Ia for a red-giant companion at
(green lines), a
main-sequence companion at
(blue lines), and
a
main-sequence companion at
(red lines). The ultraviolet light curves are
constructed by integrating the flux in the region 1000 – 3000 Å and converting to the AB magnitude
system. For all light curves shown, the viewing angle is 0. Image reproduced with permission
from [340], copyright by AAS.
![2 × 1013 cm](article929x.gif)
![t < 8](article930x.gif)
![13 2 × 10 cm](article931x.gif)
![6 M ⊙](article932x.gif)
![12 2 × 10 cm](article933x.gif)
![2 M ⊙](article934x.gif)
![5 × 1011 cm](article935x.gif)