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arXiv 2006.03590astro-ph.SRastro-ph.HE
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Iax型超新星喷出物与氦伴星的相互作用

The interaction of Type Iax supernova ejecta with a helium companion star

Yaotian Zeng, Zheng-Wei Liu, Zhanwen Han

摘要:

Iax型超新星(SNe Iax)是Ia型超新星的一个重要的亚发光类型。然而,它们的祖先和爆炸机理至今仍不清楚。有人认为,SNe Iax可能是由氦(He)星施主双星系统中质量为600万吨的白矮星(WD)的弱爆燃爆炸产生的。在这样的祖系统中,剥离的He同伴物质所造成的喷射物的同伴相互作用,预计将提出一些他的功能,在其后期的光谱。然而,在SNe Iax的晚期光谱中探测到He线还没有成功,这给出了剥离的He质量的上限< 0.002-0.1太阳质量。在这项工作中,我们研究了SN Iax喷出物和一个He星同伴之间的相互作用进行三维流体动力学模拟与弱纯爆燃爆炸模型。我们发现,大约0.004太阳质量的He物质可以剥离的伴星由SN爆炸,这是非常接近(或低于)的观测上限的总剥离的He质量在SNe Iax。因此,我们的结论是,没有检测到的He线在晚时间光谱的SNe Iax可以合理地解释,如果他们确实是从弱纯爆燃爆炸的祖系统与He星捐助者的质量WDs。

英文摘要:

Type Iax supenovae (SNe Iax) are an important sub-luminous class of SNe Ia. However, their progenitors and explosion mechanism have not been understood yet. It has been suggested that SNe Iax may be produced from weak deflagration explosions of Chandrasekhar-mass white dwarfs (WDs) in binary systems with a helium (He) star donor. In such progenitor systems, the stripped He companion material caused by the ejecta-companion interaction is expected to present some He features in their late-time spectra. However, the detection of He lines in late-time spectra of SNe Iax has not yet been successful, which gives an upper limit on the amount of stripped He mass of < 0.002-0.1 solar masses. In this work, we study the interaction between SN Iax ejecta and a He star companion by performing three-dimensional hydrodynamical simulations with a weak pure deflagration explosion model. We find that about 0.004 solar masses of He material can be stripped off from the companion star by SN explosion, which is very close to (or lower than) the observational upper-limit on the total stripped He mass in SNe Iax. We, therefore, conclude that non-detection of He lines in late-time spectra of SNe Iax could be reasonably explained if they are indeed resulted from weak pure deflagration explosions of Chandrasekhar-mass WDs in progenitor systems with a He star donor.

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