Producing Type Iax supernovae from a specific class of helium-ignited WD explosions

	Producing Type Iax supernovae from a specific class of helium-ignited WD explosions
	Wang B(王博)1,2 ; Justham, S 3; Han ZW(韩占文)1,2
刊名	ASTRONOMY & ASTROPHYSICS
	2013-11
卷号	559 页码:1-8
关键词	binaries: close stars: evolution supernovae: general
ISSN号	0004-6361
通讯作者	Wang, B (reprint author), Chinese Acad Sci, Yunnan Observ, Kunming 650011, Peoples R China.
产权排序	第一完成单位
英文摘要	Context. It has recently been proposed that one subclass of Type Ia supernovae (SNe Ia) is sufficiently distinct and sufficiently common to be classified separately from the bulk of SNe Ia; the suggested class name is Type lax supernovae (SNe lax), after SN 2002cx. However, their progenitors are still uncertain. Aims. We study whether the population properties of this class might be understood if the events originate from a subset of subChandrasekhar mass explosions. In this potential progenitor population, a carbon-oxygen white dwarf (CO WD) accumulates a helium layer from a non-degenerate helium star; ignition of that helium layer then leads to ignition of the CO WD. Methods. We incorporated detailed binary evolution calculations for the progenitor systems into a binary population synthesis model to obtain rates and delay times for these events. Results. The predicted Galactic event rate of these explosions is similar to 1.5 x 10(-3) yr(-1) according to our standard model, in good agreement with the measured rates of SNe lax. In addition, predicted delay times are similar to 70 Myr-800 Myr, consistent with the fact that most of SNe lax have been discovered in late-type galaxies. If the explosions are assumed to be double detonations -following current model expectations - then, based on the CO WD masses at explosion, we also estimate the distribution of resulting SN brightness (-13 greater than or similar to M-bol greater than or similar to -19 mag), which can reproduce the empirical diversity of SNe lax. Conclusions. We speculate on why binaries with non-degenerate donor stars might lead to SNe lax if similar systems with degenerate donors do not. We suggest that the high mass of the helium layer necessary for ignition at the lower accretion rates typically delivered from non-degenerate donors might be necessary to produce SN 2002cx-like characteristics, perhaps even by changing the nature of the CO ignition.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	MASS WHITE-DWARFS ; SUB-CHANDRASEKHAR SUPERNOVAE ; DELAY-TIME DISTRIBUTION ; STAR DONOR CHANNEL ; IA SUPERNOVAE ; DOUBLE-DETONATION ; RATIO DISTRIBUTION ; STELLAR EVOLUTION ; SPECTROSCOPIC BINARIES ; VISUAL BINARIES
收录类别	SCI ; EI
原文出处	http://www.aanda.org/articles/aa/abs/2013/11/aa22298-13/aa22298-13.html
语种	英语
WOS记录号	WOS:000327847200094
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/4546]
专题	云南天文台_大样本恒星演化研究组云南天文台_中国科学院天体结构与演化重点实验室
作者单位	1.Yunnan Observatories, Chinese Academy of Sciences, 650011 Kunming, PR China 2.Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, 650011 Kunming, PR China 3.National Astronomical Observatories, Chinese Academy of Sciences, 100012 Beijing, PR China
推荐引用方式 GB/T 7714	Wang B,Justham, S,Han ZW. Producing Type Iax supernovae from a specific class of helium-ignited WD explosions[J]. ASTRONOMY & ASTROPHYSICS,2013,559:1-8.
APA	Wang B,Justham, S,&Han ZW.(2013).Producing Type Iax supernovae from a specific class of helium-ignited WD explosions.ASTRONOMY & ASTROPHYSICS,559,1-8.
MLA	Wang B,et al."Producing Type Iax supernovae from a specific class of helium-ignited WD explosions".ASTRONOMY & ASTROPHYSICS 559(2013):1-8.