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Fig. 3


Time-series of UV-wavelength spectroscopy of SN 2011iv obtained with Swift (purple) and HST (blue) over the course of nearly a month beginning 5 d before maximum brightness. Smoothed versions of the Swift spectra are presented in black. The insets are close-up views of the wavelength ranges 1700–3000 (left) and 2900–3900 (right), comparing the 0 d spectrum of SN 2011iv to the 0 d spectra of SN 2011fe (pink; Mazzali et al. 2014) and SN 2013dy (green; Pan et al. 2015). The light-blue vertical areas mark the regions fλ (2770) and fλ (2900), which define the UV ratio (see Appendix A). The green and blue shaded regions indicate the area enclosed by the pseudo-equivalent widths defined as pW01 and pW02, respectively (Sect. 5.1.2).

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