White dwarf deflagrations for Type Iax supernovae: polarisation signatures from the explosion and companion interaction

White dwarf deflagrations for Type Iax supernovae: polarisation signatures from the explosion and companion interaction
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Iax 型超新星的白矮星爆燃:爆炸和伴星相互作用的偏振特征

DOI:
10.1051/0004-6361/201937245
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发表时间:
2020-02
期刊:
Astronomy & Astrophysics
影响因子:
--
通讯作者:
Seitenzahl I. R.
Seitenzahl I. R.
中科院分区:
其他
文献类型:
--
作者:
Bulla M.;Liu Z. -W.;Roepke F. K.;Sim S. A.;Fink M.;Kromer M.;Pakmor R.;Seitenzahl I. R.

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越来越多的证据表明,Iax 型超新星可能是双星系统中钱德拉塞卡质量白矮星热核爆燃的结果。我们进行了蒙特卡罗辐射传输模拟,并预测了源自超新星爆炸以及随后的喷射物与伴星相互作用的光谱偏振特征。具体来说,我们为模拟钱德拉塞卡质量白矮星爆燃的 3D 模型计算与视角相关的通量和偏振光谱,并为第二个模型模拟喷射物与主序星的相互作用。我们发现,由于爆炸的整体球对称性和在喷射物成分中占主导地位的铁族元素的去极化贡献,内在信号是弱偏振的并且仅轻度依赖于视角。与伴星的相互作用在喷射物中形成一个空腔,并产生可检测到的但适度的信号,该信号仅在相对蓝色的波长(小于或类似于 5000 埃)下才显着。特别是,对于远离腔体的观察者方向,预计光谱会越来越暗、越来越红,而对于远离腔体 30 度和 45 度的方向,在蓝色波长处发现类似于 0.2% 的适度偏振信号 P。我们发现从这些方向观察到的相互作用模型与 SN 2005hk 的光谱偏振数据之间存在合理的一致性,并将该事件在蓝色波长处看到的最大光偏振信号解释为喷射物-伴星相互作用的可能特征。我们鼓励对 SNe Iax 进行进一步的极化观测,以测试我们的结果是否可以扩展并推广到整个 SN Iax 类。
Growing evidence suggests that Type Iax supernovae might be the result of thermonuclear deflagrations of Chandrasekhar-mass white dwarfs in binary systems. We carry out Monte Carlo radiative transfer simulations and predict spectropolarimetric features originating from the supernova explosion and subsequent ejecta interaction with the companion star. Specifically, we calculate viewing-angle dependent flux and polarisation spectra for a 3D model simulating the deflagration of a Chandrasekhar-mass white dwarf and, for a second model, simulating the ejecta interaction with a main-sequence star. We find that the intrinsic signal is weakly polarised and only mildly viewing-angle dependent, owing to the overall spherical symmetry of the explosion and the depolarising contribution of iron-group elements dominating the ejecta composition. The interaction with the companion star carves out a cavity in the ejecta and produces a detectable, but modest signal that is significant only at relatively blue wavelengths (less than or similar to 5000 angstrom). In particular, increasingly fainter and redder spectra are predicted for observer orientations further from the cavity, while a modest polarisation signal P similar to 0.2 per cent is found at blue wavelengths for orientations 30 degrees and 45 degrees away from the cavity. We find a reasonable agreement between the interaction model viewed from these orientations and spectropolarimetric data of SN 2005hk and interpret the maximum-light polarisation signal seen at blue wavelengths for this event as a possible signature of the ejecta-companion interaction. We encourage further polarimetric observations of SNe Iax to test whether our results can be extended and generalised to the whole SN Iax class.
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