Stellar Forensics with Stripped Core-collapse SN: Measured Metallicities at the Explosion Sites of SN IIb, Ib and Ic

Details Stellar Forensics with Stripped Core-collapse SN: Measured Metallicities at the Explosion Sites of SN IIb, Ib and Ic Stellar Forensics with Stripped Core-collapse SN: Measured Metallicities at the Explosion Sites of SN IIb, Ib and Ic

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21535604m&link_type=abstract

American Astronomical Society, AAS Meeting #215, #356.04; Bulletin of the American Astronomical Society, Vol. 42, p.540

Astronomy and Astrophysics

Astronomy

Scientific paper

Metallicity is one of the fundamental parameters predicted to impact the evolution of massive stars (> 8 Msun) as well as their explosive deaths as core-collapse supernovae (CCSN) and as long-duration GRBs. However, there are surprisingly few direct observational constraints on the local metallicities of CCSN from massive progenitors that have been stripped of progressively larger amounts of their hydrogen and helium envelopes (SN IIb, Ib, Ic), collectively called stripped-envelope CCSN.
Here we present 30 host galaxy spectra at the sites of stripped CCSN obtained with Keck I + LRIS, the largest data set to date. We measure local oxygen abundances in a robust, self-consistent manner in order to constrain their progenitor population. The novel aspects of our work include a) obtaining spectra of the nuclear regions of the SN host galaxies as well as at the SN site because of radial metallicity gradients in spiral galaxies, b) performing the abundance measurements in a self-consistent way with different oxygen abundance calibrations, and c) including stripped CCSN from both targeted and untargeted SN surveys in order to alleviate any survey bias. It is the first uniform, statistically significant and direct study of its kind, with which we are in a powerful position to assess theoretical models of the two different progenitor channels for stripped CCSN, namely single massive stars and the binary channel, which predict different metallicity dependencies for the different CCSN subtypes.
M.M. is supported by a research fellowship from the Miller Institute for Basic Research at UC Berkeley.

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