吸积白矮星:WD组成对缓慢吸积过程中氦点火的影响

IF 1.1 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS
Harish Kumar, Abhinav Gupta, Siddharth Savyasachi Malu, Shashikant Gupta
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引用次数: 0

摘要

了解Ia型超新星的爆炸机制是天体物理学中最具挑战性的问题之一。在这方面,来自伴星的碳氧白矮星(CO)上物质的吸积是最重要的关键之一。我们的目的是研究富氦物质缓慢吸积过程中WD组成对各参数的影响。我们使用计算机模拟代码“恒星天体物理实验模块”(MESA)来了解其性质的变化,如比热(\(C_P\))和简并参数(\(\eta \))。比热分布呈不连续,简并参数分布在点火区附近呈下降趋势。正如预期的那样,在吸积过程中,WD的大小减小,g的大小增大。然而,在接近尾声的快速点燃后,观察到红巨星般的膨胀。我们的研究解释了由于CO-WD中碳丰度的差异导致氦点火延迟的原因。我们发现,碳丰度较低的WDs在氦点火开始前的吸积时间稍长。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Accreting white dwarfs: effect of WD composition on helium ignition during slow accretion

Accreting white dwarfs: effect of WD composition on helium ignition during slow accretion

Understanding the explosion mechanism of type Ia supernova is among the most challenging issues in astrophysics. Accretion of matter on a carbon–oxygen (CO) white dwarf (WD) from a companion star is one of the most important keys in this regard. Our aim is to study the effects of WD composition on various parameters during the accretion of helium-rich matter at a slow rate. We have used the computer simulation code Modules for Experiments in Stellar Astrophysics (MESA) to understand the variations in the properties, such as specific heat (\(C_P\)) and degeneracy parameter (\(\eta \)). The profile of specific heat shows a discontinuity and that of the degeneracy parameter shows a dip near the ignition region. As expected, the size of WD decreases and g increases during the accretion. However, a red-giant-like expansion is observed after the rapid ignition towards the end. Our study explains the reason behind the delay in onset of helium ignition due to the difference in carbon abundance in a CO-WD. We found that WDs of the lower abundance of carbon, accrete slightly longer before the onset of helium ignition.

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来源期刊
Journal of Astrophysics and Astronomy
Journal of Astrophysics and Astronomy 地学天文-天文与天体物理
CiteScore
1.80
自引率
9.10%
发文量
84
审稿时长
>12 weeks
期刊介绍: The journal publishes original research papers on all aspects of astrophysics and astronomy, including instrumentation, laboratory astrophysics, and cosmology. Critical reviews of topical fields are also published. Articles submitted as letters will be considered.
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