Presentation 1 : None
On the relative frequencies of core-collapse supernovae sub-types: the role of progenitor metallicity
N. Prantzos and S. Boissier
We show that the observed ratio of the subtypes
Ib,c and II core-collapse supernovae depends on the metallicity
of the host galaxy, as expected on theoretical grounds. However,
the observed relation differs considerably from expectations
based on non-rotating models of single stars with mass loss.
We argue that the predictions of recent models with rotation offer
a much better agreement with observations, at least for progenitor stars
with solar metallicity; calculations of models with higher and lower
metallicities are required in order to substantiate these conclusions.
We also suggest that systematic surveys of core collapse
supernovae up to redshift z~1 with the SNAP satellite
would allow to probe the effect of metallicity on supernovae
properties during the past history of the universe.