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arXiv 1808.07580astro-ph.SRastro-ph.HE
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IIb型超新星的祖先:I。进化途径和速率

Progenitors of Type IIb Supernovae: I. Evolutionary Pathways and Rates

Niharika Sravan, Pablo Marchant, Vassiliki Kalogera

摘要:

IIb型超新星(SNe)是理解剥离包络(SE)超新星(SN)祖先剥离机制的重要候选者。虽然二元相互作用及其高发生率通常被引用以支持它们作为IIb型SN祖细胞,但这种想法尚未使用覆盖广泛参数空间的模型进行测试。在本文中,我们使用非旋转的单星和双星模型,在太阳和低金属度跨越一个广泛的参数空间的初级质量,质量比,轨道周期,和质量传递效率。我们发现,我们的单星和双星模型有助于大致相等,但小,在太阳金属丰度的IIb型SNe的数量。双星仅在低金属丰度时作为祖先占主导地位。我们还发现,我们的模型可以解释不到一半的观测推断率IIb型SNe在太阳金属丰度,计算率~<4%的核心崩溃(CC)SNe。另一方面,我们的模型可以解释目前在低金属丰度的观测表明的速率,计算的速率高达15%的CC SNe。然而,这需要低的传质效率(~<0.1)以防止大多数祖细胞进入接触。我们认为,在我们的模型中使用的太阳金属丰度的恒星风质量损失率太高。较低的质量损失率将扩大太阳金属丰度的二进制IIb型SNe的参数空间,允许恒星在其演化过程中较早开始质量转移,达到CC而不被完全剥离。

英文摘要:

Type IIb supernovae (SNe) are important candidates to understand mechanisms that drive the stripping of stripped-envelope (SE) supernova (SN) progenitors. While binary interactions and their high incidence are generally cited to favor them as Type IIb SN progenitors, this idea has not been tested using models covering a broad parameter space. In this paper, we use non-rotating single- and binary-star models at solar and low metallicities spanning a wide parameter space in primary mass, mass ratio, orbital period, and mass transfer efficiencies. We find that our single- and binary-star models contribute to roughly equal, however small, numbers of Type IIb SNe at solar metallicity. Binaries only dominate as progenitors at low metallicity. We also find that our models can account for less than half the observationally inferred rate for Type IIb SNe at solar metallicity, with computed rates ~<4% of core-collapse (CC) SNe. On the other hand, our models can account for the rates currently indicated by observations at low metallicity, with computed rates as high as 15% of CC SNe. However, this requires low mass transfer efficiencies (~<0.1) to prevent most progenitors from entering contact. We suggest that the stellar wind mass-loss rates at solar metallicity used in our models are too high. Lower mass-loss rates would widen the parameter space for binary Type IIb SNe at solar metallicity by allowing stars that initiate mass transfer earlier in their evolution to reach CC without getting fully stripped.

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