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Progenitor diagnostics for stripped core-collapse supernovae: Measured metallicities at explosion sites

Modjaz, M and Kewley, L and Bloom, JS and Filippenko, AV and Perley, DA and Silverman, JM (2011) Progenitor diagnostics for stripped core-collapse supernovae: Measured metallicities at explosion sites. The Astrophysical Journal Letters, 731 (L4). ISSN 2041-8205

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Abstract

Metallicity is expected to influence not only the lives of massive stars but also the outcome of their deaths as supernovae (SNe) and gamma-ray bursts (GRBs). However, there are surprisingly few direct measurements of the local metallicities of different flavors of core-collapse SNe (CCSNe). Here, we present the largest existing set of host-galaxy spectra with H II region emission lines at the sites of 35 stripped-envelope CCSNe. We derive local oxygen abundances in a robust manner in order to constrain the SN Ib/c progenitor population. We obtain spectra at the SN sites, include SNe from targeted and untargeted surveys, and perform the abundance determinations using three different oxygen-abundance calibrations. The sites of SNeIc (the demise of the most heavily stripped stars, having lost both H and He layers) are systematically more metal rich than those of SNeIb (arising from stars that retained their He layer) in all calibrations. A Kolmogorov-Smirnov test yields the very low probability of 1% that SN Ib and SN Ic environment abundances, which are different on average by ∼0.2 dex (in the Pettini & Pagel scale), are drawn from the same parent population. Broad-lined SNeIc (without GRBs) occur at metallicities between those of SNeIb and SNeIc. Lastly, we find that the host-galaxy central oxygen abundance is not a good indicator of the local SN metallicity; hence, large-scale SN surveys need to obtain local abundance measurements in order to quantify the impact of metallicity on stellar death. © 2011. The American Astronomical Society. All rights reserved.

Item Type: Article
Uncontrolled Keywords: 0201 Astronomical And Space Sciences
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: American Astronomical Society
Date Deposited: 18 May 2017 10:41
Last Modified: 18 May 2017 10:41
DOI or Identification number: 10.1088/2041-8205/731/1/L4
URI: http://researchonline.ljmu.ac.uk/id/eprint/6478

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