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arXiv 1109.4573astro-ph.SRastro-ph.HE
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一颗延迟时间很短的Ia型超新星的前身?

The progenitor of a type Ia supernova with a short delay time?

S. Mereghetti, N. La Palombara, A. Tiengo, P. Esposito, L. Stella, G. L. Israel

摘要:

HD 49798/RXJ 0648.0 -4418是唯一已知的由一颗热亚矮星和一颗大质量白矮星(M=1.28+/-0.05 Msun)组成的X射线双星。这个系统的轨道周期为1.55天,是一个共同的包层演化的结果,最有可能是一对初始质量约为8-10 Msun的恒星。当处于氦燃烧阶段的热亚矮星再次膨胀并充满其罗奇瓣时,增强的质量转移可以迅速使已经很大的白矮星超过阿拉塞卡极限。可能的最终命运,无论是Ia型超新星爆炸或吸积引起的崩溃,是特别有趣的,鉴于高转速的这颗恒星,它具有最短的自旋周期(13秒)观察到的白矮星。

英文摘要:

HD49798/RXJ0648.0-4418 is the only known X-ray binary composed of a hot subdwarf and a massive white dwarf (M=1.28+/-0.05 Msun). This system, with an orbital period of 1.55 days, is the outcome of a common envelope evolution, most likely of a pair of stars with initial masses of about 8-10 Msun. When the hot subdwarf, currently in a He-burning phase, will expand again and fill its Roche-lobe, the enhanced mass transfer can rapidly bring the already massive white dwarf above the Chandrasekhar limit. The possible final fate, either a Type Ia supernova explosion or an accretion induced collapse, is particularly interesting in view of the high rotational velocity of this star, which has the shortest spin period (13 s) observed in a white dwarf.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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