Past and future of the central double-degenerate
core of Henize 2-428
Dong-Hao Wu;Dong-Dong Liu;Bo Wang
【期刊名称】《天文和天体物理学研究》 【年(卷),期】2024(019)004
【摘要】It has been suggested that Type Ⅰa supernovae (SNe Ⅰa) could be produced in the conditions of the violent merger scenario of the double-degenerate model,in which a thermonuclear explosion could be produced when a double carbon-oxygen white dwarf (CO WD) merges.It has been recently found that the nucleus of the bipolar planetary nebula Henize 2-428 consists of a double CO WD system that has a total mass of ～ 1.76 M☉,a mass ratio of ～ 1 and an orbital period of ～ 4.2 h,which is the first and only discovered progenitor candidate for an SN Ⅰa predicted by the violent merger scenario.In this work,we aim to reproduce the evolutionary history of the central double CO WD of Henize 2-428.We find that the planetary nebula Henize 2-428 may originate from a primordial binary that has a ～ 5.4 M☉ primary and a ～ 2.7 M☉ secondary with an initial orbital period of ～ 15.9 d.The double CO WD was formed after the primordial binary experienced two Roche-lobe
overflows
and
two
common-envelope
ejection
processes.According to our calculations,it takes about ～ 840 Myr for the double CO WD to merge and form an SN Ⅰa driven by gravitational
wave radiation after their birth.To produce the current status of Henize 2-428,a large common-envelope parameter is needed.We also estimate that the rate of SNe Ⅰa from the violent merger scenario is at most 2.9 × 10-4 yr-1,and that the delay time is in the range of ～ 90 Myr to the Hubble time.
【总页数】6页(89-94) 【关键词】
【作者】Dong-Hao Wu;Dong-Dong Liu;Bo Wang
【作者单位】Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, China;Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650216,China;University of Chinese Academy of Sciences, Beijing 100049, China 【正文语种】英文 【中图分类】 【文献来源】
https://www.zhangqiaokeyan.com/academic-journal-cn_research-astronomy-astrophysics_thesis/0201272734212.html 【相关文献】
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Past and future of the central double-degenerate core of Henize 2-428
