Local Environments of Low-redshift Supernovae

We characterize the local (2-kpc sized) environments of Type Ia, II, and Ib/c supernovae (SNe) that have recently occurred in nearby ($d\lesssim50$ Mpc) galaxies. Using ultraviolet (UV, from GALEX) infrared (IR, WISE) maps 359 galaxies a sample 472 SNe, we measure star formation rate surface density ($\Sigma_{\rm SFR}$) stellar mass ($\Sigma_\star$) 2-kpc beam centered on each SN site. show core-collapse SNe are preferentially located along resolved galactic star-forming main sequence, whereas Ia extended to lower values $\Sigma_{\rm SFR}$ at fixed $\Sigma_\star$, indicative locations inside quiescent or regions also test how well radial distribution type matches distributions UV IR light host galaxy. find that, first order, all types mirror both near-IR (3.4 4.5 microns, tracing distribution) mid-IR (12 22 emission hot, small grains), resemble our best-estimate SFR}$. All appear more radially concentrated than their In detail, II statistical differences light. attribute this overall structural uniformity fact within any individual galaxy, $\Sigma_\star$ track one another well, with variations SFR}/\Sigma_\star$ most visible when comparing between