[vsnet-campaign-sn 1009] SN Ia progenitor

[Taichi Kato]

SN Ia progenitor

   Another supernova progenitor issue.  A revival of a sub-Chandrasekhar
mass model?

Paper: astro-ph/0506415
Date: Fri, 17 Jun 2005 14:41:42 GMT   (79kb)

Title: Constraints on the Progenitor Systems of Type Ia Supernovae
Authors: Maximilian Stritzinger (MPA), Bruno Leibundgut (ESO), Stefanie Walch
  (USM), Gertrud Contardo (MPA)
Comments: 8 pages, 1 table, 7 figures, submitted to A&A
\\
  UVOIR bolometric light curves provide valuable insight into the nature of
type Ia supernovae. We present an analysis of sixteen well-observed SNe Ia.
Constraints are placed on several global parameters concerning the progenitor
system, explosion mechanism and subsequent radiation transport. By fitting a
radioactive decay energy deposition function to the quasi-exponential phase (50
to 100 days after maximum light), it is found that the ejected mass varies by
at least a factor of two. This result suggests that a sub-Chandrasekhar mass
model could be responsible for the progenitor system of some type Ia
supernovae. We find that the range in the amount of synthesized (56)Ni
indicates a significant variation in the burning mechanism. In order to explain
a factor of ten range in the observed bolometric luminosity more detailed
modeling of the explosion mechanism is required.
\\ ( http://arXiv.org/abs/astro-ph/0506415 ,  79kb)