The outcomes of carbon–oxygen white dwarfs accreting CO-rich material
The outcomes of carbon–oxygen white dwarfs accreting CO-rich material
复制标题
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
中科院分区:
文献类型:
--
作者:
吴程远
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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DOI:
10.1086/522367
发表时间:
2006-02
期刊:
The Astrophysical Journal
影响因子:
--
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通讯作者:
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DOI:
10.1086/378952
发表时间:
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期刊:
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影响因子:
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影响因子:
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作者:
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DOI:
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发表时间:
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期刊:
The Astrophysical Journal
影响因子:
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DOI:
10.1088/2041-8205/735/2/l35
发表时间:
2011-05
期刊:
The Astrophysical Journal Letters
影响因子:
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