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CO observations allow estimations of the gas content of molecular clouds,which trace the reservoir of cold gas fuelling star formation, as well as todetermine extinction via H$_2$ column density, N(H$_2$). Here, we studiedmillimetric and optical properties at 26 supernovae (SNe) locations ofdifferent types in a sample of 23 nearby galaxies by combining molecular$^{12}$C$^{16}$O (J = 1 $\rightarrow$ 0) resolved maps from the EDGE survey andoptical Integral Field Spectroscopy from the CALIFA survey. We found an evenclearer separation between type II and type Ibc SNe in terms of molecular gasthan what we found in the optical using H$\alpha$ emission as a proxy forcurrent SF rate, which reinforces the fact that SNe Ibc are more associatedwith SF-environments. While A$_V$ at SN locations is similar for SNe II and SNeIbc, and higher compared to SNe Ia, N(H$_2$) is significantly higher for SNeIbc than for SNe II and SNe Ia. When compared to alternative extinctionestimations directly from SN photometry and spectroscopy, we find that our SNeIbc have also redder color excess but showed standard Na I D absorptionpseudo-equivalent widths ($\sim$1 \AA). In some cases we find no extinctionwhen estimated from the environment, but high amounts of extinction whenmeasured from SN observations, which suggests that circumstellar material ordust sublimation may be playing a role. This work serves as a benchmark forfuture studies combining last generation millimeter and optical IFS instrumentsto reveal the local environmental properties of extragalactic SNe.

Molecular gas at supernova local environments unveiled by EDGE