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Stefano Benetti based on data from literature and

Detailed study of nearby SNIa. Stefano Benetti based on data from literature and. (astro-ph/0411059). Aim: understanding the diversity among “all normal” SNIa through a sample of best studied, archive and recent objects (26). SN 2003du. (Stanishev et al 2005). SN 2002er.

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Stefano Benetti based on data from literature and

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  1. Detailed study of nearby SNIa Stefano Benetti based on data from literature and (astro-ph/0411059)

  2. Aim: understanding the diversity among “all normal” SNIa through a sample of best studied, archive and recent objects (26)

  3. SN 2003du (Stanishev et al 2005)

  4. SN 2002er (Pignata et al 2004)

  5. premax spectra Profile and intensity of SiII 6355 Faint SiIII 4553-4568  cooler spectra SN 1994D -8d (1.32) structures  higher velocities SN 2002bo -8d (1.13) SN 1990N -8d (1.07) SN 1998bu -7d (1.01) structures in H&K absorption (Benetti et al 2004) Trento, September 2003

  6. SN 1994D -1d (SiII) SN 2002bo +0.1d SN 1990N +1d SN 1998bu -1d at max …. (Benetti et al 2004) Trento, September 2003

  7. SN94D –8.5d SN02bo –8.5d SN99ee –9d SN02bo +11.1d SN99ee +8d after max  more homogeneous SN02bo +29.4d SN99ee +32d intensity and shape of MgII line  premax inhomogeneity IR (Benetti et al 2004)

  8. Hamuy et al. (1996) m15(B) Nugent et al. 95 Δm15 or (SiII)

  9. multidimensional Hatano et al. 2000 t=10d

  10. 1988

  11. an observer`s modern version SiII

  12. Some systematics come out

  13. -v/t ~ 60-70 km/s/d Hierarchical cluster analysis

  14. blue and green same luminosity! <MB> = -19.2 ± 0.3 <MB> = -19.3 ± 0.3 <MB> = -17.2 ± 0.6 Photometry:

  15. (SiII) vs. Δm15 red and blue form the Nugent’s relation?

  16. Velocity gradient vs. Δm15

  17. (SiII) evolution greens show no evolution!

  18. SII expansion velocity (Benetti et al 2004) Padova, June 2004

  19. SVG (green) 2.5 HVG (blue) 0.6 FAINT (red) -1.4 (~3-4!)

  20. Summary detailed observations  new clues for SNIa interpretation velocity gradient is an important observational parameter three families: green – blue (see also Wang et al 2004) - red in average: green are +homogeneous, +young population, but same brightness of blue Reasons ?? Different explosions; mixing; CSM-ejecta interaction?

  21. (Rescaled distance cluster) Dendrogram: the clustering

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