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Abstract: We present constraints on the progenitor metallicities of core-collapsesupernovae. To date, nearly all metallicity constraints have been inferred fromindirect methods such as metallicity gradients in host galaxies, luminositiesof host galaxies, or derived global galaxy metallicities. Here, progenitormetallicities are derived from optical spectra taken at the sites of nearbysupernovae, from the ratio of strong emission lines found in their host HIIregions.We present results from the spectra of 74 host HII regions and discussthe implications that these have on the nature of core-collapse supernovaprogenitors. Overall, while we find that the mean metallicity of type Ibcenvironments is higher than that of type II events, this difference is smallerthan observed in previous studies. There is only a 0.06 dex difference in themean metallicity values, at a statistical significance of ~1.5 sigma, whileusing a KS-test we find that the two metallicity distributions are marginallyconsistent with being drawn from the same parent population probability >10%.This argues that progenitor metallicity is not a dominant parameter in decidingsupernovae type, with progenitor mass and-or binarity playing a much moresignificant role.



Author: J. P. Anderson, R. A. Covarrubias, P. A. James, M. Hamuy, S. M. Habergham

Source: https://arxiv.org/







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