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arXiv 2108.12435astro-ph.SRastro-ph.HE
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亚克拉塞卡质量白矮星双爆轰的多维辐射转移计算

Multi-Dimensional Radiative Transfer Calculations of Double Detonations of Sub-Chandrasekhar-Mass White Dwarfs

Ken J. Shen, Samuel J. Boos, Dean M. Townsley, Daniel Kasen

摘要:

双爆轰Ia型超新星的研究,其中氦壳爆轰触发碳核爆轰在亚克拉塞卡质量的白矮星,在过去的十年中经历了复苏。新的进化方案和对哪些核反应是必不可少的更好理解,使得白矮星的氦壳比几十年前的双爆方案更薄,从而成功地爆炸。在本文中,我们提出了第一套光变曲线和光谱的多维辐射转移计算薄壳双爆轰模型,探讨了一系列的白矮星和氦壳质量。我们发现广泛的协议与观察到的光变曲线和光谱的非奇特的Ia型超新星,从次发光的过发光的亚型,提供证据表明,双爆炸的亚克拉塞卡质量白矮星产生的大部分观察到的Ia型超新星。光谱速度和颜色的一些差异仍然存在,但这些可能会通过未来的计算,包括更准确的初始条件和辐射输运物理达成一致。

英文摘要:

Study of the double detonation Type Ia supernova scenario, in which a helium shell detonation triggers a carbon core detonation in a sub-Chandrasekhar-mass white dwarf, has experienced a resurgence in the past decade. New evolutionary scenarios and a better understanding of which nuclear reactions are essential have allowed for successful explosions in white dwarfs with much thinner helium shells than in the original, decades-old incarnation of the double detonation scenario. In this paper, we present the first suite of light curves and spectra from multi-dimensional radiative transfer calculations of thin-shell double detonation models, exploring a range of white dwarf and helium shell masses. We find broad agreement with the observed light curves and spectra of non-peculiar Type Ia supernovae, from subluminous to overluminous subtypes, providing evidence that double detonations of sub-Chandrasekhar-mass white dwarfs produce the bulk of observed Type Ia supernovae. Some discrepancies in spectral velocities and colors persist, but these may be brought into agreement by future calculations that include more accurate initial conditions and radiation transport physics.

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