observe for CC SNe in barred and unbarred Sa–Sbc galaxies (see the middle panel of Fig. \[hist\_distr\] and fig. 8 in ). The region between the central component and bar-end radius of H$\alpha$ emission profiles is termed the ‘star formation desert’ (SFD) by @2015MNRAS.450.3503J. In addition, they noted that the SFD had significant continuum emission in the $R$-band and even showed line emission not consistent with expectations from star formation, but most probably from an old stellar population.

Taking into consideration that the distributions of Type Ia and CC SNe, respectively, trace the distributions of $R$-band continuum emission/stellar mass and H$\alpha$ emission/star formation , we compare the inner ($\tilde{r} \leqslant 0.3$) fractions of different SNe ($F_{\rm SN}$) in barred and unbarred host galaxies (see Table \[table0.3ratios\]). This inner region is selected because in Sa–Sbc subsample the SNe dominate in Sb–Sbc galaxies (see Table \[table\_SN\_morph\]), where the mean SFD region has outer radius $\sim0.3$ of the optical radius (see fig. 5 in ).[^15]

Table \[table0.3ratios\] shows that the inner $\tilde{r} \leqslant 0.3$ fractions of Type Ia SNe in Sa–Sbc and Sc–Sm hosts are not statistically different between barred and unbarred galaxies. The same situation holds true for CC SNe in Sc–Sm 