Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21821902s&link_type=abstract
American Astronomical Society, AAS Meeting #218, #219.02; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
Metallicity is a key parameter of the progenitors of Type Ib/c core-collapse supernovae. It has profound consequences for constraining their progenitor model and their connection to long-duration GRBs. Moreover, it constrains their delay-time distribution, which is imperative to modeling galactic chemical evolution. We employ deep follow-up observations from the LDSS-3 long-slit spectrograph of the Magellan telescopes to study a growing sample of more than two dozen Ibc host galaxies. These supernovae are not subject to bias due to the galaxy luminosity-metallicity relationship, as they were selected only from untargeted transient searches including Pan-STARRS, Nearby Supernova Factory, and the SDSS-II Supernova Survey. We employ strong line methods to determine the host galaxy oxygen abundance and are developing new statistical methods to produce an accurate understanding of the associated uncertainties, both random and systematic. We use the 2D long-slit spectra to provide additional information on the progenitor environment by exploring the abundance distribution as a function of host galaxy radius. We compare our sample to the host galaxies of SNe from targeted surveys to characterize the potential effects of bias. We compare to GRB hosts to explore the connection between Ib/c supernovae and long-duration GRB progenitors.
Levesque Emily M.
Sanders Nathan
Soderberg Alicia Margarita
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