S19B0054abst

S19B0054

Early high-resolution spectroscopy is essential for understanding of progenitors of supernovae (SNe) and the medium they explode in. Time-variable circumstellar (CS) signatures can be used to map the final stages of the progenitor star through its mass loss history. SNe also provide excellent torches to study interstellar (IS) absorption lines and Diffuse Interstellar Bands (DIBs) along the line-of-sight in non-local regions of the host galaxies, which can mostly be tackled through a non-time-variable component(s). As the expected line widths are less than 100 km s⁻¹ both for CSM and ISM, high-resolution spectra are needed. Thanks to recent high-cadence surveys, very early follow-up can be made to explore CS material in a new time domain than previously possible. Here we propose a pilot study to observe one nearby core-collapse SN in a time sequence starting within a week after explosion. An additional few SNe will be observed in time sequence starting at 1-2 weeks after explosion, which already expands our time domain in high resolution spectra. The new data will expand the study of the CS environment so far obtained only for extreme cases as the tip of the iceberg to a generic picture covering various progenitors.

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