论文标题
IAX类型Supernova类型2019muj的属性在后期：铁，富含铁的生存，性质和起源
Properties of Type Iax Supernova 2019muj in the Late Phase: Existence, Nature and Origin of the Iron-rich Dense Core
论文作者
论文摘要
IAX型超新星（SNE IAX）形成了一类奇特的SNE IA，其早期光谱具有与规范的SNE IA具有主要光谱线的识别，但具有更高的电离和较低的线速度。在许多方面，他们的后期行为偏离了通常的sne ia； SNE IAX在几次100天内一直显示光谱光谱，并且发光度下降非常慢。在目前的工作中，我们研究了SN IAX 2019muj的延迟光谱，包括约500天的新呈现光谱。频谱仍然由允许的过渡但电离状态较低，可能检测到[O I] 6300，6363。它与外射流不同；最终组件的质量约为0.03 MSUN，由Fe支配（最初为56ni），以〜760 km/s的速度扩展。我们认为，内部成分的性质是通过失败/弱的白色紫外线热核爆炸场景来解释的。我们建议，最初限制在（信封）中的56ni富材料中的一部分可以通过56ni/co/fe衰减的能量输入来弹出，从而形成了“第二'Unbound'Unbound Ejecta组件，从而形成了表现为在后期内看到的内部密度分量。
Type Iax Supernovae (SNe Iax) form a class of peculiar SNe Ia, whose early-phase spectra share main spectral line identifications with canonical SNe Ia but with higher ionization and much lower line velocities. Their late-time behaviors deviate from usual SNe Ia in many respects; SNe Iax keep showing photospheric spectra over several 100 days and the luminosity decline is very slow. In the present work, we study the late-time spectra of SN Iax 2019muj including a newly-presented spectrum at ~500 days. The spectrum is still dominated by allowed transitions but with lower ionization state, with possible detection of [O I]6300, 6363. By comprehensively examining the spectral formation processes of allowed transitions (Fe II, Fe I, and the Ca II NIR triplet) and forbidden transitions ([Ca II]7292, 7324 and the [O I]), we quantitatively constrain the nature of the innermost region and find that it is distinct from the outer ejecta; the mass of the innermost component is ~0.03 Msun dominated by Fe (which can be initially 56Ni), expanding with the velocity of ~760 km/s. We argue that the nature of the inner component is explained by the failed/weak white-dwarf thermonuclear explosion scenario. We suggest that a fraction of the 56Ni-rich materials initially confined in (the envelope of) the bound remnant can later be ejected by the energy input through the 56Ni/Co/Fe decay, forming the `second' unbound ejecta component which manifests itself as the inner dense component seen in the late phase.
