Binary population synthesis for the core-degenerate scenario of type Ia supernova progenitors  

作　　者：Wei-Hong Zhou Bo Wang Xiang-Cun Meng Dong-Dong Liu Gang Zhao 

机构地区：[1]Key Laboratory of Optical Astronomy,National Astronomical Observatories,Chinese Academy of Sciences [2]University of Chinese Academy of Sciences [3]Yunnan Minzu University [4]Yunnan Observatories,Chinese Academy of Sciences [5]Key Laboratory for the Structure and Evolution of Celestial Objects,Chinese Academy of Sciences

出　　处：《Research in Astronomy and Astrophysics》2015年第10期1701-1712,共12页天文和天体物理学研究（英文版）

基　　金：supported by the National Basic Research Program of China(973 program,2014CB845700);the National Natural Science Foundation of China(Grant Nos.11322327,11390371,11473063,11033008 and 61561053);the Foundation of State Ethnic Affairs Commission(Grant No.12YNZ008);the Science Foundation of Key Laboratory in Software Engineering(Grant No.2012SE402);the Natural Science Foundation of Yunnan Province(Grant Nos.2013FB083 and 2013HB097)

摘　　要：The core-degenerate （CD） scenario has been suggested to be a possible progenitor model of type Ia supernovae （SNe Ia）, in which a carbon-oxygen white dwarf merges with the hot CO core of a massive asymptotic giant branch star dur- ing their common-envelope phase. However, the SN Ia birthrates for this scenario are still uncertain. We conducted a detailed investigation into the CD scenario and then gave the birthrates for this scenario using a detailed Monte Carlo binary pop- ulation synthesis approach. We found that the delay times of SNe Ia from this sce- nario are -70 Myr- 1400 Myr, which means that the CD scenario contributes to young SN Ia populations. The Galactic SN Ia birthrates for this scenario are in the range of ~7.4×10^-5 yr^-1- 3.7 × 10^-4 yr^-1, which roughly accounts for -2%-10% of all SNe Ia. This indicates that, under the assumptions made here, the CD scenario only contributes a small portion of all SNe Ia, which is not consistent with the results of Ilkov ＆ Soker.The core-degenerate （CD） scenario has been suggested to be a possible progenitor model of type Ia supernovae （SNe Ia）, in which a carbon-oxygen white dwarf merges with the hot CO core of a massive asymptotic giant branch star dur- ing their common-envelope phase. However, the SN Ia birthrates for this scenario are still uncertain. We conducted a detailed investigation into the CD scenario and then gave the birthrates for this scenario using a detailed Monte Carlo binary pop- ulation synthesis approach. We found that the delay times of SNe Ia from this sce- nario are -70 Myr- 1400 Myr, which means that the CD scenario contributes to young SN Ia populations. The Galactic SN Ia birthrates for this scenario are in the range of ~7.4×10^-5 yr^-1- 3.7 × 10^-4 yr^-1, which roughly accounts for -2%-10% of all SNe Ia. This indicates that, under the assumptions made here, the CD scenario only contributes a small portion of all SNe Ia, which is not consistent with the results of Ilkov ＆ Soker.

关 键 词：binaries： close -- stars： evolution -- supernovae： general 

分 类 号：P145.3[天文地球—天体物理] TH74[天文地球—天文学]