All Figures

$\begin{figure} \par\includegraphics[width=10.9cm,clip]{6971fig1.eps} \end{figure}$ Figure 1: SN 2005cf spectral time sequence. The flux spectra are shown in rest frame. The epochs with respect to B-band maximum light are reported on the left end side of each spectrum. The $\oplus$ symbol marks the atmospheric absorptions.
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In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{6971fig2.eps} \end{figure}$ Figure 2: SN 2005cf in comparison with other SNe at day -11.6 (SN 1990N, Leibundgut et al. 1991; SN 1994D, Patat et al. 1996; SN 2003du, Stanishev et al. 2007; SN 2002bo, Benetti et al. 2004; SN 2002er, Kotak et al. 2005).
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In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{6971fig3.eps} \end{figure}$ Figure 3: SN 2005cf in comparison with other SNe at day -6.4, (SN 1994D, Patat et al. 1996; SN 2003du, Stanishev et al. 2007; SN 2002bo, Benetti et al. 2004; SN 2002er, Kotak et al. 2005).
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In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{6971fig4.eps} \end{figure}$ Figure 4: SN 2005cf in comparison with other SNe at day +4.7, (SN 1990N, Leibundgut et al. 1991; SN 1994D, Patat et al. 1996; SN 2003du, Stanishev et al. 2007; SN 2002bo, Benetti et al. 2004; SN 2002er, Kotak et al. 2005).
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In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{6971fig5.eps} \end{figure}$ Figure 5: SN 2005cf in comparison with other SNe at day +16.4, (SN 1990N, Leibundgut et al. 1991; SN 2003du, Stanishev et al. 2007; SN 2002er, Kotak et al. 2005).
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In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{6971fig6.eps} \end{figure}$ Figure 6: SN 2005cf in comparison with other SNe at day +52.4, (SN 1994D, Patat et al. 1996; SN 2003du, Stanishev et al. 2007; SN 1996X, Salvo et al. 2001).
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In the text

$\begin{figure} \par\includegraphics[width=3.1cm,clip]{6971fig7.eps}\end{figure}$ Figure 7: The first three weeks of evolution in velocity space of Si II $\lambda$ 6355 for SN 2005cf. Vertical lines indicate 10 000 and 18 000 km s^-1.
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In the text

$\begin{figure} \par\includegraphics[width=3.75cm,clip]{6971fig8.eps}\includegraphics[width=3.7cm,clip]{6971fig9.eps} \end{figure}$ Figure 8: The evolution in velocity space of Si II $\lambda$ 6355 in SN 2005cf compared with the synthetic models produced with SYNOW ( left) and residuals to the observed spectra ( right). Long dashed blue lines show SYNOW fits without high velocity Si II. Short dashed red lines show SYNOW fits with high-velocity Si II. See Table 2 for details.
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In the text

$\begin{figure} \par\includegraphics[width=4.05cm,clip]{6971fig10.eps} \end{figure}$ Figure 9: The velocity space distribution of Si II $\lambda$ 6355 in the -10.2 days spectrum of SN 2005cf compared with a variety of synthetic spectra produced with SYNOW. The different synthetic spectra reproduce the effect of varying the key parameters through their plausible ranges. (1) Best fit, including both the HVC and PVC. (2) Fit including only the PVC with v_e=6.3. (3) Parameters as in the best fit but with the $v_{\rm min}=17.5$ for the HVC. (4) Parameters as in the best fit but with the $v_{\rm min}=21.5$ for the HVC. (5) Parameters as in the best fit but with the v₌e=6.3 for the HVC. (6) Fit including only the HVC detached at $v_{\rm phot}=21~000$ km s^-1.
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In the text

$\begin{figure} \par\includegraphics[width=3.75cm,clip]{6971fig11.eps}\includegraphics[width=3.7cm,clip]{6971fig12.eps}\end{figure}$ Figure 10: Comparison of the Si II $\lambda$ 6355 line profile of different type Ia SNe at around day -11.6 in velocity space ( left) and residuals to the observed spectra ( right). Long dashed blue lines show SYNOW fits without high velocity Si II. Short dashed red lines show SYNOW fits with high-velocity Si II. See Table 3 for details.
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In the text

$\begin{figure} \par\includegraphics[width=3.7cm,clip]{6971fig13.eps}\end{figure}$ Figure 11: Comparison of the Si II $\lambda$ 6355 line profile of different type Ia SNe at day around -5.3.
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In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{6971fig14.eps}\end{figure}$ Figure 12: a) SN 2005cf time scan in velocity space for Ca II H&K. b) SN 2005cf time scan in velocity space for Ca II IR triplet.
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In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{6971fig15.eps} \end{figure}$ Figure 13: Expansion velocities as measured from the minima of Ca II H&K of SN 2005cf compared with the values of other SNe taken from Wells et al. (1994), Garnavich et al. (2004), Kirshner et al. (1993), Patat et al. (1996), Jha et al. (1999), Garavini et al. (2005), and references therein. Values for SN 2005cf are marked as filled circles when fitting the whole feature with a single Gaussian model. Filled squared symbols mark the results obtained when a deblending with a double Gaussian model was performed. Measured values for the single Gaussian model are reported in Table 4.
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In the text

$\begin{figure} \par\includegraphics[width=7.5cm,clip]{6971fig16.eps} \end{figure}$ Figure 14: Expansion velocities as measured from the minima of Si II $\lambda$ 6355 of SN 2005cf compared with the values of other SNe taken from Li et al. (1999), Li et al. (2001), Garnavich et al. (2004), Salvo et al. (2001), Garavini et al. (2005), and references therein. Values for SN 2005cf are marked as filled circles. Measured values are reported in Table 4.
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In the text

$\begin{figure} \par\includegraphics[width=7cm,clip]{6971fig17.ps} \end{figure}$ Figure 15: Light curve decline rate $\Delta m_{15}$ versus $\mathcal{R}($ Si II). The symbols are chosen accordingly with in Benetti et al. (2005). Open squares mark SNe belonging to the LVG group, filled squares mark the HVG group, and starred symbols mark the FAINT group. Other filled symbols mark the objects presented in Garavini et al. (2005) and SN 2005cf.
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In the text

$\begin{figure} \par\includegraphics[width=6.35cm,clip]{6971fig18.ps} \end{figure}$ Figure 16: Plot of $\Delta m_{15}$ versus v₁₀(Si II). Symbols as in Fig. 15.
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In the text

$\begin{figure} \par\includegraphics[width=7.05cm,clip]{6971fig19.ps} \end{figure}$ Figure 17: Plot of $\Delta m_{15}$ versus $\dot{v}$ . Symbols as in Fig. 15.
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In the text

$\begin{figure} \par\includegraphics[width=6.4cm,clip]{6971fig20.ps} \end{figure}$ Figure 18: Plot of $\dot{v}$ versus v₁₀(Si II). Symbols as in Fig. 15.
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In the text

$\begin{figure} \par\includegraphics[width=10.9cm,clip]{6971fig1.eps} \end{figure}$	Figure 1: SN 2005cf spectral time sequence. The flux spectra are shown in rest frame. The epochs with respect to B-band maximum light are reported on the left end side of each spectrum. The $\oplus$ symbol marks the atmospheric absorptions.
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$\begin{figure} \par\includegraphics[width=7.5cm,clip]{6971fig2.eps} \end{figure}$	Figure 2: SN 2005cf in comparison with other SNe at day -11.6 (SN 1990N, Leibundgut et al. 1991; SN 1994D, Patat et al. 1996; SN 2003du, Stanishev et al. 2007; SN 2002bo, Benetti et al. 2004; SN 2002er, Kotak et al. 2005).
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$\begin{figure} \par\includegraphics[width=7.5cm,clip]{6971fig3.eps} \end{figure}$	Figure 3: SN 2005cf in comparison with other SNe at day -6.4, (SN 1994D, Patat et al. 1996; SN 2003du, Stanishev et al. 2007; SN 2002bo, Benetti et al. 2004; SN 2002er, Kotak et al. 2005).
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$\begin{figure} \par\includegraphics[width=7.5cm,clip]{6971fig4.eps} \end{figure}$	Figure 4: SN 2005cf in comparison with other SNe at day +4.7, (SN 1990N, Leibundgut et al. 1991; SN 1994D, Patat et al. 1996; SN 2003du, Stanishev et al. 2007; SN 2002bo, Benetti et al. 2004; SN 2002er, Kotak et al. 2005).
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$\begin{figure} \par\includegraphics[width=7.5cm,clip]{6971fig5.eps} \end{figure}$	Figure 5: SN 2005cf in comparison with other SNe at day +16.4, (SN 1990N, Leibundgut et al. 1991; SN 2003du, Stanishev et al. 2007; SN 2002er, Kotak et al. 2005).
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$\begin{figure} \par\includegraphics[width=7.5cm,clip]{6971fig6.eps} \end{figure}$	Figure 6: SN 2005cf in comparison with other SNe at day +52.4, (SN 1994D, Patat et al. 1996; SN 2003du, Stanishev et al. 2007; SN 1996X, Salvo et al. 2001).
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$\begin{figure} \par\includegraphics[width=3.1cm,clip]{6971fig7.eps}\end{figure}$	Figure 7: The first three weeks of evolution in velocity space of Si II $\lambda$ 6355 for SN 2005cf. Vertical lines indicate 10 000 and 18 000 km s^-1.
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$\begin{figure} \par\includegraphics[width=3.75cm,clip]{6971fig8.eps}\includegraphics[width=3.7cm,clip]{6971fig9.eps} \end{figure}$	Figure 8: The evolution in velocity space of Si II $\lambda$ 6355 in SN 2005cf compared with the synthetic models produced with SYNOW ( left) and residuals to the observed spectra ( right). Long dashed blue lines show SYNOW fits without high velocity Si II. Short dashed red lines show SYNOW fits with high-velocity Si II. See Table 2 for details.
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$\begin{figure} \par\includegraphics[width=3.75cm,clip]{6971fig11.eps}\includegraphics[width=3.7cm,clip]{6971fig12.eps}\end{figure}$	Figure 10: Comparison of the Si II $\lambda$ 6355 line profile of different type Ia SNe at around day -11.6 in velocity space ( left) and residuals to the observed spectra ( right). Long dashed blue lines show SYNOW fits without high velocity Si II. Short dashed red lines show SYNOW fits with high-velocity Si II. See Table 3 for details.
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$\begin{figure} \par\includegraphics[width=3.7cm,clip]{6971fig13.eps}\end{figure}$	Figure 11: Comparison of the Si II $\lambda$ 6355 line profile of different type Ia SNe at day around -5.3.
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$\begin{figure} \par\includegraphics[width=7.5cm,clip]{6971fig14.eps}\end{figure}$	Figure 12: a) SN 2005cf time scan in velocity space for Ca II H&K. b) SN 2005cf time scan in velocity space for Ca II IR triplet.
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$\begin{figure} \par\includegraphics[width=7.5cm,clip]{6971fig16.eps} \end{figure}$	Figure 14: Expansion velocities as measured from the minima of Si II $\lambda$ 6355 of SN 2005cf compared with the values of other SNe taken from Li et al. (1999), Li et al. (2001), Garnavich et al. (2004), Salvo et al. (2001), Garavini et al. (2005), and references therein. Values for SN 2005cf are marked as filled circles. Measured values are reported in Table 4.
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$\begin{figure} \par\includegraphics[width=7cm,clip]{6971fig17.ps} \end{figure}$	Figure 15: Light curve decline rate $\Delta m_{15}$ versus $\mathcal{R}($ Si II). The symbols are chosen accordingly with in Benetti et al. (2005). Open squares mark SNe belonging to the LVG group, filled squares mark the HVG group, and starred symbols mark the FAINT group. Other filled symbols mark the objects presented in Garavini et al. (2005) and SN 2005cf.
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$\begin{figure} \par\includegraphics[width=6.35cm,clip]{6971fig18.ps} \end{figure}$	Figure 16: Plot of $\Delta m_{15}$ versus v₁₀(Si II). Symbols as in Fig. 15.
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$\begin{figure} \par\includegraphics[width=7.05cm,clip]{6971fig19.ps} \end{figure}$	Figure 17: Plot of $\Delta m_{15}$ versus $\dot{v}$ . Symbols as in Fig. 15.
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$\begin{figure} \par\includegraphics[width=6.4cm,clip]{6971fig20.ps} \end{figure}$	Figure 18: Plot of $\dot{v}$ versus v₁₀(Si II). Symbols as in Fig. 15.
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