Top: SN 2018bsz optical-wavelength spectra obtained at eight days prior to maximum light, three days after maximum light, and one week post maximum. The positions of host H II region emission lines (not associated with the SN) are indicated as dashed blue vertical lines, while narrow absorption from Milky-Way Na I D absorption is shown as a dashed yellow line (and a zoom also showing such absorption within the host is presented in the bottom panel). C II line rest wavelengths are indicated by grey vertical lines, while the position of both the peaks and the troughs of the O II features is shown in red. We also identify relatively narrow emission features in the absorption troughs of C II, that we label as “High Velocity, HV” features. Narrow calcium H + K absorption from within the host galaxy is also observed. Bottom: a zoom of the spectral region between 5800 Å and 6150 Å as seen in the X-shooter spectrum (three days post maximum). The latter shows the clear detection of sodium absorption within the host galaxy of SN 2018bsz, together with the strong MW sodium absorption.
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