The outcomes of carbon–oxygen white dwarfs accreting CO-rich material

The outcomes of carbon–oxygen white dwarfs accreting CO-rich material
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碳氧白矮星吸积富含二氧化碳物质的结果

DOI:
10.1093/mnras/sty3176
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发表时间:
2018-11
影响因子:
4.8
通讯作者:
吴程远
吴程远
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
吴程远

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双简并模型是Ia型超新星(SNE Ia)前身的两个经典模型之一,涉及双碳-氧白矮星的合并。以前的研究表明,如果合并过程中的质量吸积率(M·acc)相对较高,则会发生偏心碳燃烧,从而形成氧霓虹。(一)可能塌缩成中子星的核心。然而,偏离中心的碳燃烧仍未被完全理解,特别是当向内传播的燃烧波到达中心时。在本文中,我们旨在研究燃烧波的传播特性以及这些CO核的后续演化结果。在厚盘假设(慢合并)的基础上,用恒星演化程序MESA模拟了富CO物质聚积的CO WDS的长期演化。基于厚盘假设,我们发现CO WDS的最终结果强烈依赖于M·acc(M yr−1),它可分为四个区域:(1)中心爆炸碳点火,然后是SNE Ia(M·acc<2.45×10−6);(2)OSI核,然后是中子星(2.45×10−6 M·acc<4.5×10−6);(3)一个核,然后是e俘获Se(4.5×10−6 M·acc&lt);1.05×10−5);(4)偏心氧和霓虹灯点火,然后偏心爆炸或硅铁芯(M·acc 1.05×10−5)。研究结果表明,两次合并的最终命运强烈依赖于合并过程(如缓慢合并、快速合并、复合合并、激烈合并等)。
The double-degenerate model, involving the merger of double carbon–oxygen white dwarfs.(CO WDs), is one of the two classic models for the progenitors of Type Ia supernovae (SNe Ia)..Previous studies suggested that off-centre carbon burning would occur if the mass accretion rate.(M˙ acc) is relatively high during the merging process, leading to the formation of oxygen–neon.(ONe) cores that may collapse into neutron stars. However, the off-centre carbon burning is.still incompletely understood, especially when the inwardly propagating burning wave reaches.the centre. In this paper, we aim to investigate the propagating characteristics of burning waves.and the subsequently evolutionary outcomes of these CO cores. We simulated the long-term.evolution of CO WDs that accrete CO-rich material by employing the stellar evolution code.MESA on the basis of the thick-disc assumption (slow merger). We found that the final outcomes.of CO WDs strongly depend on M˙ acc (M yr−1) based on the thick-disc assumption, which.can be divided into four regions: (1) explosive carbon ignition in the centre, then SNe Ia.(M˙ acc < 2.45 × 10−6); (2) OSi cores, then neutron stars (2.45 × 10−6 M˙ acc < 4.5 × 10−6);.(3) ONe cores, then e-capture SNe (4.5 × 10−6 M˙ acc < 1.05 × 10−5); (4) off-centre oxygen.and neon ignition, then off-centre explosion or Si–Fe cores (M˙ acc 1.05 × 10−5). Our results.indicate that the final fates of double CO WD mergers are strongly dependent on the merging.processes (e.g. slow merger, fast merger, composite merger, violent merger, etc.)
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