The surviving companions in type Ia supernova remnants

The surviving companions in type Ia supernova remnants
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Ia型超新星遗迹中幸存的伴星

DOI:
10.1088/1674-4527/17/8/83
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发表时间:
2017-07
影响因子:
1.8
通讯作者:
韩占文
韩占文
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
陈俐鯖;孟祥存;韩占文

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单简并(SD)模型是 Ia 型超新星(SNe Ia)最流行的前身模型之一,其中伴星在 SN Ia 爆炸后能够幸存并表现出奇特的性质。因此,在Ia型超新星遗迹(SNR)中寻找幸存的伴星是验证SD模型的一种潜在方法。在 SN 1604 遗迹(开普勒的信噪比)中,虽然钱德拉 X 射线观测表明其前身很可能是 WD+AGB 系统,但幸存的伴星尚未被发现。一个可能的原因是白矮星(WD)的快速自转,导致WD的爆炸延迟了一个自转时间尺度,然后伴星在超新星爆炸之前演化为WD,因此伴星太暗而无法被探测到。我们的目标是通过进行二元演化计算来验证这种可能的解释。在本文中,我们使用 Eggleton 的恒星演化代码来计算由 WD+红巨星(RG)组成的双星的演化。我们假设快速旋转的WD当其质量超过钱德拉塞卡质量极限(M Ch = 1.378 M ⊙ )时可以不断增加其质量,直到传质速率降低到低于临界值。最终,我们获得了 WD 的最终质量,范围为 1.378 M⊙ 到 2.707 M⊙。我们还表明,如果自转时间小于106年,伴星将非常明亮且易于观测;但如果自转时间长达 ∼ 107 年,幸存伴星的光度将低于检测极限。我们的模拟为在 SNR 中寻找幸存伴星提供了指导,而在开普勒 SNR 中没有发现幸存伴星的事实可能并不是不利于开普勒 SN 的 SD 起源的明确证据。
The single-degenerate (SD) model is one of the most popular progenitor models of type Ia supernovae (SNe Ia), in which the companion star can survive after an SN Ia explosion and show peculiar properties. Therefore, searching for the surviving companion in type Ia supernova remnants (SNRs) is a potential method to verify the SD model. In the SN 1604 remnant (Kepler’s SNR), although Chandra X-ray observation suggests that the progenitor is most likely a WD+AGB system, a the surviving companion has not been found. One possible reason is rapid rotation of the white dwarf (WD), causing explosion of the WD to be delayed for a spin-down timescale, and then the companion evolved into a WD before the supernova explosion, so the companion is too dim to be detected. We aim to verify this possible explanation by carrying out binary evolution calculations. In this paper, we use Eggleton’s stellar evolution code to calculate the evolution of binaries consisting of a WD+red giant (RG). We assume that the rapidly rotating WD can continuously increase its mass when its mass exceeds the Chandrasekhar mass limit ( M Ch = 1.378 M ⊙ ) until the mass-transfer rate decreases to be lower than a critical value. Eventually, we obtain the final masses of a WD in the range 1.378 M⊙ to 2.707 M⊙. We also show that if the spin-down time is less than 106 yr, the companion star will be very bright and easily observed; but if the spin-down time is as long as ∼ 107 yr, the luminosities of the surviving companion would be lower than the detection limit. Our simulation provides guidance in hunting for the surviving companion stars in SNRs, and the fact that no surviving companion has been found in Kepler’s SNR may not be definite evidence disfavoring the SD origin of Kepler’s SN.
DOI: 10.1088/2041-8205/778/2/l35
发表时间: 2013-11
期刊: The Astrophysical Journal Letters
影响因子: --
作者:
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通讯作者: X. Meng;P. Podsiadlowski
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发表时间: 2005-02
影响因子: 6.5
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DOI: 10.1088/2041-8205/756/1/l4
发表时间: 2012-07
期刊: The Astrophysical Journal Letters
影响因子: --
作者:
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DOI: 10.1093/mnras/285.4.696
发表时间: 1997-03
影响因子: 4.8
作者:
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DOI: 10.1088/0004-637x/759/1/7
发表时间: 2012-07
期刊: The Astrophysical Journal
影响因子: --
作者:
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通讯作者: W. E. Kerzendorf;B. Schmidt;J. B. Laird;P. Podsiadlowski;M. Bessell