Sugar: When Spectra Help Standardizing Supernovae
Résumé
Type Ia supernovae (SNIa) have now a long track record of producing strong
constraints on cosmological parameters, and are expected to play still an
important role in future stage IV experiments such as LSST. However, our
understanding of their variability has gone few alterations through the years:
popular spectral energy density (SED) models like SALT-II for instance still
describe supernovae as depending mostly on 2 parameters. They however do not
reflect the observed spectral diversity of Type Ia supernovae. With the help of
the Nearby Supernova Factory data, we revisit the spectral diversity of the SNIa
to build a novel SED model, SUGAR (Supernovae Useful Generator And
Reconstructor). We will present the derivation of the model, and discuss the
perspectives it opens for supernova standardization.