On the relative frequencies of core-collapse supernovae sub-types: The role of progenitor metallicity
Institut d'Astrophysique de Paris, 98bis Bd. Arago, 75104 Paris, France
2 Carnegie Observatories, 813 Santa Barbara Str., Pasadena, Ca 91101, USA e-mail: email@example.com
Corresponding author: N. Prantzos, firstname.lastname@example.org
Accepted: 8 May 2003
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 1 with the SNAP satellite would allow to probe the effect of metallicity on supernovae properties during the past history of the Universe.
Key words: stars: general / stars: evolution / stars: supernovae: general
© ESO, 2003