磁化主序星演化形成的超钱德拉塞卡白矮星：来自STARS模拟的新质量极限
Super-Chandrasekhar white dwarfs by the evolution of magnetized main-sequence stars: New mass-limits from STARS simulation
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中文总结 AI 辅助
本研究通过STARS模拟，探讨磁化主序星演化至白矮星的过程，发现磁场可产生超钱德拉塞卡质量极限的稳定白矮星，其质量极限受磁场几何、吸积和冷却影响，解释了特殊超新星现象。
中文摘要 AI 辅助
我们通过一系列模型探索了磁化主序星（MSs）向磁化非旋转白矮星（WDs）的时间演化，并捕捉了修改后的赫罗图。我们使用剑桥恒星演化代码STARS，并引入磁效应和冷却进行修改。我们研究了稳定、磁化、大质量、超钱德拉塞卡、近似球形的白矮星（远离钱德拉塞卡质量-半径曲线）可能存在的可能性，这些我们称之为B-WDs。它们是从特殊的超亮Ia型超新星（如SN2003fg）的观测中推断出来的。我们表明，磁场的经典效应显著影响MSs及其向WDs的时间演化。此外，磁场可能对解释某些亚钱德拉塞卡白矮星（如SDSS J123204.19+522548.2）中观测到的异常大半径起决定性作用，同时还有有限温度效应。我们进一步研究了低于和高于钱德拉塞卡极限的磁化白矮星的稳定性，并确认了超钱德拉塞卡B-WDs存在的可能性，其新的质量极限取决于磁场几何、来自伴星的质量吸积和冷却速率。因此，虽然“钱德拉塞卡极限”可能被视为神圣不可侵犯，但其数值严重依赖于底层物理，这里即磁场。
英文摘要
We explore the time evolution of the magnetized main-sequence stars (MSs) to magnetized non-rotating white dwarfs (WDs) with a series of models, capturing modified Hertzsprung-Russell diagram. We use the Cambridge Stellar evolution code, STARS, with modifications by introducing magnetic effects and cooling. We investigate the possible existence of stable, magnetized, massive, super-Chandrasekhar, approximately spherical WDs, away from Chandrasekhar's mass-radius curve. These we refer to as B-WDs. They are inferred from the observations of peculiar over-luminous type Ia supernovae, e.g. SN2003fg. We show that the classical effects of magnetic fields significantly impact MSs and their time evolution to WDs. Moreover, the magnetic field could be decisive in explaining the unusually large radius observed in some sub-Chandrasekhar WDs, e.g. SDSS J123204.19+522548.2, along with the finite temperature effect. We further investigate the stability of magnetized WDs, both below and above the Chandrasekhar limit and confirm the possibility of super-Chandrasekhar B-WDs with new mass limits that depend on the magnetic field geometry, mass accretion from a companion and cooling rates. Therefore, while the "Chandrasekhar limit" may be sacrosanct, its value severely depends on the underlying physics, here the magnetic field.
发表机构
- Indian Institute of Science（印度科学研究所）
- University of Florida（佛罗里达大学）
- University of Cambridge（剑桥大学）
- Institute of Physics of the Czech Academy of Sciences（捷克科学院物理研究所）
- Indian Institute of Technology Palakkad（喀拉拉邦帕拉克德印度理工学院）
机构由 AI 辅助整理，请以论文原文为准。
