Type Ia supernovae and the formation of single low-mass white dwarfs

	Type Ia supernovae and the formation of single low-mass white dwarfs
	Justham, S 1; Wolf, C 1; Podsiadlowski, P 1; Han ZW(韩占文)2
刊名	ASTRONOMY & ASTROPHYSICS
	2009-01
卷号	493 期号:3 页码:1081-1091
关键词	stars: binaries: close stars: supernovae: general stars: white dwarfs stars: kinematics
ISSN号	0004-6361
通讯作者	Justham, S (reprint author), Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China.
产权排序	第二完成单位
英文摘要	Context. There is still considerable debate over the progenitors of type Ia supernovae (SNe Ia). Likewise, it is not agreed how single white dwarfs with masses less than or similar to 0.5 M(circle dot) can be formed in the field, even though they are known to exist. Aims. We consider whether single low-mass white dwarfs (LMWDs) could have been formed in binary systems where their companions have exploded as an SN Ia. In this model, the observed single LMWDs are the remnants of giant-branch donor stars whose envelopes have been stripped off by the supernova explosion. Methods. We investigate the likely remnants of SNe Ia, including the effects of the explosion on the envelope of the donor star. We also use evolutionary arguments to examine alternative formation channels for single LMWDs. In addition, we calculate the expected kinematics of the potential remnants of SNe Ia. Results. SN Ia in systems with giant-branch donor stars can naturally explain the production of single LMWDs. It seems difficult for any other formation mechanism to account for the observations, especially for those single LMWDs with masses <= 0.4 M(circle dot). Independent of those results, we find that the kinematics of one potentially useful population containing single LMWDs is consistent with our model. Studying remnant white-dwarf kinematics seems to be a promising way to investigate SN Ia progenitors. Conclusions. The existence of single LMWDs appears to constitute evidence for the production of SNe Ia in binary systems with a red-giant donor star. Other single white dwarfs with higher space velocities support a second, probably dominant, population of SN Ia progenitors which contained main-sequence or subgiant donor stars at the time of explosion. The runaway stars LP 400-22 and US 708 suggest the possibility of a third formation channnel for some SNe Ia in systems where the donor stars are hot subdwarfs.
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]	DIGITAL SKY SURVEY ; X-RAY BINARIES ; VERY-LOW MASS ; MIDINFRARED EMISSION ; CIRCUMBINARY DISKS ; STELLAR EVOLUTION ; SPACE-TELESCOPE ; GALACTIC HALO ; RADIO PULSARS ; KPD 1930+2752
收录类别	SCI ; EI
原文出处	http://www.aanda.org/articles/aa/abs/2009/03/aa10106-08/aa10106-08.html
语种	英语
WOS记录号	WOS:000262641100028
内容类型	期刊论文
源URL	[http://ir.ynao.ac.cn/handle/114a53/4478]
专题	云南天文台_大样本恒星演化研究组
作者单位	1.Department of Physics, Oxford University, Keble Road, Oxford, OX1 3RH, UK 2.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, Kunming, 650011, PR China
推荐引用方式 GB/T 7714	Justham, S,Wolf, C,Podsiadlowski, P,et al. Type Ia supernovae and the formation of single low-mass white dwarfs[J]. ASTRONOMY & ASTROPHYSICS,2009,493(3):1081-1091.
APA	Justham, S,Wolf, C,Podsiadlowski, P,&Han ZW.(2009).Type Ia supernovae and the formation of single low-mass white dwarfs.ASTRONOMY & ASTROPHYSICS,493(3),1081-1091.
MLA	Justham, S,et al."Type Ia supernovae and the formation of single low-mass white dwarfs".ASTRONOMY & ASTROPHYSICS 493.3(2009):1081-1091.