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We investigate how the different types of supernovae are relatively affectedby the metallicity of their host galaxy. We match the SAI Supernova Catalog tothe SDSS-DR4 catalog of star-forming galaxies with measured metallicities.These supernova host galaxies span a range of oxygen abundance from 12 +log(O/H) = 7.9 to 9.3 (~ 0.1 to 2.7 solar) and a range in absolute magnitudefrom MB = -15.2 to -22.2. To reduce the various observational biases, we selecta subsample of well-characterized supernovae in the redshift range from 0.01 to0.04, which leaves us with 58 SN II, 19 Ib/c, and 38 Ia. We find strongevidence that SN Ib/c are occurring in higher-metallicity host galaxies than SNII, while we see no effect for SN Ia relative to SN II. We note some extremeand interesting supernova-host pairs, including the metal-poor (~ 1/4 solar)host of the recent SN Ia 2007bk, where the supernova was found well outside ofthis dwarf galaxy. To extend the luminosity range of supernova hosts to evenfainter galaxies, we also match all the historical supernovae with z < 0.3 tothe SDSS-DR6 sky images, resulting in 1225 matches. This allows us to identifysome even more extreme cases, such as the recent SN Ic 2007bg, where the likelyhost of this hypernova-like event has an absolute magnitude MB ~ -12, making itone of the least-luminous supernova hosts ever observed. This low-luminosityhost is certain to be very metal poor (~ 1/20 solar), and therefore thissupernova is an excellent candidate for association with an off-axis GRB. Thetwo catalogs that we have constructed are available online and will be updatedregularly. Finally, we discuss various implications of our findings forunderstanding supernova progenitors and their host galaxies.

Characterizing Supernova Progenitors via the Metallicities of their Host Galaxies, from Poor Dwarfs to Rich Spirals