Birthrates and delay times of Type Ia supernovae

Abstract

Type Ia supernovae (SNe Ia) play an important role in diverse areas of astrophysics, from the chemical evolution of galaxies to observational cosmology. However, the nature of the progenitors of SNe Ia is still unclear. In this paper, according to a detailed binary population synthesis study, we obtained SN Ia birthrates and delay times from different progenitor models, and compared them with observations. We find that the Galactic SN Ia birthrate from the double-degenerate (DD) model is close to those inferred from observations, while the birthrate from the single-degenerate (SD) model accounts for only about 1/2-2/3 of the observations. If a single starburst is assumed, the distribution of the delay times of SNe Ia from the SD model is a weak bimodality, where the WD + He channel contributes to the SNe Ia with delay times shorter than 100Myr, and the WD + MS and WD + RG channels to those with age longer than 1Gyr.

11 pages, 2 figures, accepted by Science in China Series G (Dec.30, 2009)

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• A hot subdwarf-white dwarf super-Chandrasekhar candidate supernova Ia progenitor
• The helium star donor channel for the progenitors of type Ia supernovae with different metallicities
• Some constraints on the lower mass limit for double-degenerate progenitors of Type Ia supernovae
• Companion stars of Type Ia supernovae and single low-mass white dwarfs
• The mechanism of Supernova Ia explosion in elliptical galaxies
• A likely candidate of type Ia supernova progenitors: the X-ray pulsating companion of the hot subdwarf HD 49798
• The core-degenerate scenario for the progenitors of type Ia supernovae
• A super-Chandrasekhar mass type Ia supernova progenitor at 49 pc set to detonate in 23 Gyr
• A search for new symbiotic stars in the Milky Way: Using machine learning techniques applied to photometric databases