A COMPREHENSIVE PROGENITOR MODEL FOR SNe Ia

摘要: Although the nature of progenitor Type Ia supernovae (SNe Ia) is still unclear, single-degenerate (SD) channel for currently accepted, in which a carbon-oxygen white dwarf (CO WD) accretes hydrogen-rich material from its companion, increases mass to Chandrasekhar limit, and then explodes as an SN Ia. The companion may be main sequence or slightly evolved star (WD + MS), red giant RG). Incorporating effect stripping accretion-disk instability on evolution WD binary, we carried out binary stellar calculations more than 1600 close binaries. As result, initial parameter spaces SNe are presented orbital period-secondary (log P i, M i 2) plane. We confirmed that MS system, leading have 1 ☉ 5 ☉. low 0.565 ☉, while lowest RG 1.0 Adopting above results, studied birth rate via population synthesis approach. found Galactic SD model (2.55-2.9) × 10-3 yr-1 (including He channel), smaller observation. If single starburst assumed, distribution delay time weak bimodality, where contributes with shorter 108 yr those age longer 6 Gyr.