The iron yield of normal Type II supernovae

We present Ni-56 mass estimates for 110 normal Type II supernovae (SNe II), computed here from their luminosity in the radioactive tail. This sample consists of SNe from the literature, with at least three photometric measurements in a single optical band within 95-320d since explosion. To convert apparent magnitudes to bolometric ones, we compute bolometric corrections (BCs) using 15 SNe in our sample having optical and near-IR photometry, along with three sets of SN II atmosphere models to account for the unobserved flux. We find that the I- and i-bands are best suited to estimate luminosities through the BC technique. The Ni-56 mass distribution of our SN sample has a minimum and maximum of 0.005 and 0.177M(circle dot), respectively, and a selection-bias-corrected average of 0.037 +/- 0.005M(circle dot). Using the latter value together with iron isotope ratios of two sets of core-collapse (CC) nucleosynthesis models, we calculate a mean iron yield of 0.040 +/- 0.005M(circle dot) for normal SNe II. Combining this result with recent mean Ni-56 mass measurements for other CC SN subtypes, we estimate a mean iron yield <0.068M(circle dot) for CC SNe, where the contribution of normal SNe II is >36 percent. We also find that the empirical relation between Ni-56 mass and steepness parameter (S) is poorly suited to measure the Ni-56 mass of normal SNe II. Instead, we present a correlation between Ni-56 mass, S, and absolute magnitude at 50d since explosion. The latter allows to measure Ni-56 masses of normal SNe II with a precision around 30 percent.