Avalanche Photodiodes

Kobayashi, M.; Matsukawa, Takashi

doi:10.1016/b978-012225261-7/50011-7

Cited by 3 publications

(1 citation statement)

References 73 publications

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“…In order for the WD mass to reach M Ia , the donor star should transfer enough material at the appropriate accretion rates. The donors of successful SN Ia cases are divided into two categories: one is composed of slightly evolved main-sequence stars with M 2 ∼ 1.7 − 3.6M ⊙ (for Z=0.02), and the other of red-giant stars with M 2 ∼ 0.8 − 3.1M ⊙ (for Z=0.02) [17]. If the progenitor system is older than 2 Gyr, it should be a system with a donor star of M 2 < 1.7M ⊙ in the red-giant branch.…”

Section: Metallicity and Age Effectsmentioning

confidence: 99%

Type Ia Supernovae: Progenitors and Diversities

Nomoto

Uenishi

Kobayashi

et al.

Eso Astrophysics Symposia

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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.Comment: 13 pages. Invited Review published in "From Twilight to Highlight: The Physics of Supernovae," eds. W. Hillebrandt & B. Leibundgut, ESO/Springer Series "ESO Astrophysics Symposia" (Berlin: Springer) p.115--127 (2003

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Section: Metallicity and Age Effectsmentioning

confidence: 99%