Accreting CO material onto ONe white dwarfs towards accretion-induced collapse

Accreting CO material onto ONe white dwarfs towards accretion-induced collapse
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将 CO 物质吸积到 ONe 白矮星上,导致吸积引起的塌陷

DOI:
10.1088/1674-4527/18/3/36
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发表时间:
2017-10
影响因子:
1.8
通讯作者:
王博
王博
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Wu C.;王博

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近几十年来,人们一直在研究吸积一颗白色矮星的最终结果,但仍有一些问题没有得到解决。近年来,一些研究表明,吸积一个质量为1000万的WDs会发生氧的爆燃。在本文中,我们的目标是调查是否ONe WD可以经历吸积诱导的崩溃(AIC)或爆炸时,他们的质量接近的Ekrasekhar极限。采用恒星演化程序梅萨,模拟了具有吸积CO物质的ONe WDs的长期演化。在质量吸积过程中,ONe WDs经历了弱的多次碳闪,导致WDs的质量增加。我们发现,不同的初始WD质量和质量吸积率的影响,中心的密度和温度的演变。然而,由于中微子冷却,中心温度不能达到爆炸氧点火温度。这项工作意味着吸积ONe WD的最终结果是电子捕获诱导的坍缩,而不是热核爆炸。
The final outcomes of accreting ONe white dwarfs (ONe WDs) have been studied for several decades, but there are still some issues that are not resolved. Recently, some studies suggested that the deflagration of oxygen would occur for accreting ONe WDs with Chandrasekhar masses. In this paper, we aim to investigate whether ONe WDs can experience accretion-induced collapse (AIC) or explosions when their masses approach the Chandrasekhar limit. Employing the stellar evolution code Modules for Experiments in Stellar Astrophysics (MESA), we simulate the long-term evolution of ONe WDs with accreting CO material. The ONe WDs undergo weak multicycle carbon flashes during the mass-accretion process, leading to mass increase of the WDs. We found that different initial WD masses and mass-accretion rates influence the evolution of central density and temperature. However, the central temperature cannot reach the explosive oxygen ignition temperature due to neutrino cooling. This work implies that the final outcome of accreting ONe WDs is electron-capture induced collapse rather than thermonuclear explosion.
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