1. Predicted Light Curves and Spectra
DD Mergers and SNe Ia:
Predicted Light Curves and Spectra
Wolfgang Hillebrandt
(for Rüdiger Pakmor, Markus Kromer, et al.)
MPI für Astrophysik
Garching

3. What started it (for us): The abundance tomography of SN 2005bl
(Hachinger et al. 2009)

4. Are some of them (or all?) “super-Chandra” mergers and/or “sub-Chandra” detonations???

5. The basic idea:
The brightness of a SN Ia (the mass of radioactive 56Ni) may be a result of different white dwarf masses !

6. So, let’s have a look at “mergers” …
(Pakmor et al.
2010)

8. Density Temperature

9. A detonation???

10. A resolution effect???

13. C O IME “Fe”

14. Light curves ...

16. … and spectra

17. Changing the mass ratio …

18. detonation
unlikely!

19. Summary and conclusions
Violent DD mergers are a robust explosion mechanism for SNe Ia (q ≥ 0.85)
Faint explosions (91bg-like): M(Ni) ≈ Msun (for M(WD) ≤ 1 Msun )
Question: How frequent are more massive WD binaries?