Evolution of Magnetized White Dwarf Binaries to Type Ia Supernovae
Evolution of Magnetized White Dwarf Binaries to Type Ia Supernovae
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DOI：
10.3847/1538-4357/aaf722
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发表时间：
2019-01
期刊：
影响因子：
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通讯作者：
I. Ablimit;K. Maeda
中科院分区：
文献类型：
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作者：
I. Ablimit;K. Maeda
随着观测到的磁性白矮星（WDs）数量的增加，磁场在单星和双星演化中的作用应该引起更多的关注。在本研究中，我们利用恒星天体物理代码中的实验模块（Modules for Experiments），分别考虑了无磁场、中等磁场和强磁场的WDs，研究了WDs /主序星双星的演化。我们主要研究了类极星系中WD的强磁场如何影响Ia型超新星（SNe Ia）的双星演化。被吸积的物质沿着磁力线向下落在极帽上，并受到磁力线强磁场的约束，因此，各向同性磁极-质量传递率的增强使磁力线即使在低质量供体和低罗氏叶溢出传质率的情况下也能保持质量增长。磁约束模型的结果表明，Ia型超新星的初始参数空间和Ia型超新星后给体的特征与Ia型超新星的初始参数空间和特征很容易区分。预测的供体性质与在几个SN残余物和附近的SNe中未发现伴星是相容的。
With the increasing number of observed magnetic white dwarfs (WDs), the role of the magnetic field of the WD in both single and binary evolutions should attract more attention. In this study, we investigate the WD/main-sequence star binary evolution with the Modules for Experiments in Stellar Astrophysics code, by considering WDs with non-, intermediate, and high magnetic field strength. We mainly focus on how the strong magnetic field of the WD (in a polar-like system) affects the binary evolution toward Type Ia supernovae (SNe Ia). The accreted matter goes along the magnetic field lines and falls down onto polar caps, and it can be confined by the strong magnetic field of the WD, so that the enhanced isotropic pole-mass transfer rate can let the WD grow in mass even with a low mass donor with a low Roche-lobe overflow mass transfer rate. The results from the magnetic confinement model show that both the initial parameter space for SNe Ia and characteristics of the donors after SNe Ia are easily distinguishable from those found in previous SNe Ia progenitor models. The predicted natures of the donors are compatible with the non-detection of a companion in several SN remnants and nearby SNe.