Birthrates and delay times of Type Ia supernovae

Details Birthrates and delay times of Type Ia supernovae Birthrates and delay times of Type Ia supernovae

2010-02-23

arxiv.org/abs/1002.4229v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

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

Scientific paper

10.1007/s11433-010-0152-8

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.

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