University of Hertfordshire

By the same authors

Type Ia supernovae: Progenitors and evolution with redshift

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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Original languageEnglish
Title of host publicationCosmic Explosions
EditorsS S Holt, W W Zhang
Place of PublicationMELVILLE
PublisherAmerican Institute of Physics
Pages35-52
Number of pages18
ISBN (Print)1-56396-943-2, 978-1563969430
Publication statusPublished - 2000
Event10th Annual Astrophysics Conference on Cosmic Explosions - COLLEGE PK
Duration: 11 Oct 199913 Oct 1999

Publication series

NameAIP Conf Procs
PublisherAmerican Institute of Physics
Volume522

Conference

Conference10th Annual Astrophysics Conference on Cosmic Explosions
CityCOLLEGE PK
Period11/10/9913/10/99

Abstract

Relatively uniform light curves and spectral evolution of Type Ia supernovae (SNe Ia) have led to the use of SNe Ia as a "standard candle" to determine cosmological parameters. Whether a statistically significant value of the cosmological constant can be obtained depends on whether the peak luminosities of SNe Ia are sufficiently free from the effects of cosmic and galactic evolutions.

Here we first review the single degenerate scenario for the Chandrasekhar mass white dwarf(WD) models of SNe Ia. We identify the progenitor's evolution and population with two channels: (1) the WD+RG (red-giant) and (2) the WD+MS (near main-sequence He-rich star) channels. In these channels, the strong wind from accreting WDs plays a key role, which yields important age and metallicity effects on the evolution.

We then address the questions whether the nature of SNe Ia depends systematically on environmental properties such as metallicity and age of the progenitor system and whether significant evolutionary effects exist. We suggest that the variation of the carbon mass fraction X(C) in the C+O WD (or the variation of the initial WD mass) causes the diversity of the brightness of SNe Ia. This model can explain the observed dependences of SNe Ia brightness on the galaxy types and the distance from the galactic center.

Finally, applying the metallicity effect on the evolution of SN la progenitors, we make a prediction of the cosmic supernova rate history as a composite of the supernova rates in different types of galaxies.

ID: 495973