Supernova Progenitor Mass and Metallicity from Integral Field Spectroscopic Study of the Environment

摘要

We present preliminary results of our investigation of core-collapse supernova (SN) progenitors by studying its immediate environment. We have obtained integral field spectroscopy of 27 SN explosion sites using UH88/SNIFS and Gemini-N/GMOS. This technique enables us to obtain both spatial and spectral information of the stellar populations present at the sites. Metallicity of the stellar population was estimated using strong-line method, while comparison with simple stellar population (SSP) models yields age. This age and metallicity were then adopted for the SN progenitor star since it is assumed to be coeval with the stellar population at the explosion site. We then determined the initial mass of the SN progenitor, whose lifetime corresponds to the age of the parent stellar population. With this strategy we envision to present the first sample of type-IIP/IIL/Ib/Ic SNe with reliable mass and metallicity determination.