Type Ia Supernovae: Progenitors and Diversities

Details Type Ia Supernovae: Progenitors and Diversities Type Ia Supernovae: Progenitors and Diversities

2003-08-08

arxiv.org/abs/astro-ph/0308138v1

Astronomy and Astrophysics

Astrophysics

13 pages. Invited Review published in "From Twilight to Highlight: The Physics of Supernovae," eds. W. Hillebrandt & B. Leibun

Scientific paper

10.1007/10828549_16

A key question for supernova cosmology is whether the peak luminosities of Type Ia supernovae (SNe Ia) are sufficiently free from the effects of cosmic and galactic evolution. To answer this question, we review the currently popular scenario of SN Ia progenitors, i.e., the single degenerate scenario for the Chandrasekhar mass white dwarf (WD) models. We identify the progenitor's evolution with two channels: (1) the WD+RG (red-giant) and (2) the WD+MS (near main-sequence He-rich star) channels. The strong wind from accreting WDs plays a key role, which yields important age and metallicity effects on the evolution. 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 SN Ia brightness. This model can explain the observed dependence of SNe Ia brightness on the galaxy types. We then predict how SN Ia brightness evolves along the redshift (with changing metallicity and age) for elliptical and spiral galaxies. Such evolutionary effects along the redshift can be corrected as has been made for local SNe Ia. We also touch on several related issues: (1) the abundance pattern of stars in dwarf spheroidal galaxies in relation to the metallicity effect on SNe Ia, (2) effects of angular momentum brought into the WD in relation to the diversities and the fate of double degenerates, and (3) possible presence of helium in the peculiar SN Ia 2000cx in relation to the sub-Chandrasekhar mass model.

Affiliated with

Also associated with

No associations

Rating

Type Ia Supernovae: Progenitors and Diversities does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Type Ia Supernovae: Progenitors and Diversities, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Type Ia Supernovae: Progenitors and Diversities will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-616857