Evidence for a correlation between the SiII λ4000 width and Type Ia supernova color
(English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357Article in journal (Refereed) Accepted
We study the pseudo equivalent width of the SiII λ4000 feature of Type Iasupernovae (SNe Ia) in the redshift range 0.0024 ≤z ≤0.634. We find that this spectral indicator correlateswith the light curve color excess SALT2 c as well as previouslydefined spectroscopic subclasses (Branch types) and theevolution of the SiII λ6150 velocity, i.e., the so called velocitygradient. Based on our study of 55 objects from different surveys, we find indications that the SiII λ4000 spectral indicatorcould provide important information to improve cosmological distancemeasurements with SNe Ia.
cosmology distance scale dust extinction - supernovae: general
Astronomy, Astrophysics and Cosmology Astronomy, Astrophysics and Cosmology
Research subject Physics; Astronomy
IdentifiersURN: urn:nbn:se:su:diva-56779OAI: oai:DiVA.org:su-56779DiVA: diva2:413040