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arXiv 2009.06405astro-ph.HEastro-ph.SR
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IIb型超新星的前身:II。可观测性质

Progenitors of Type IIb Supernovae: II. Observable Properties

Niharika Sravan, Pablo Marchant, Vassiliki Kalogera, Dan Milisavljevic, Raffaella Margutti

摘要:

IIb型超新星(SNe IIb)提供了一个独特的机会,调查的演变渠道和机制,由于各种观测的限制,管理的剥离信封SN祖星的演变。将这些约束与理论属性的全分布进行比较,不仅有助于确定自然界中观测到的属性的普遍性,而且还可以揭示当前未观测到的种群。在这篇后续论文中,我们使用Sravan等人在2019年提出的大网格模型来推导单个和二元SNe IIb祖先属性的分布,并将其与三个独立观测探测器的约束进行比较:多波段SN光变曲线,直接祖先探测和X射线/射电观测。与以前的工作相一致,我们发现,虽然目前的观测排除单星作为SN IIb的祖先,SN IIb的祖先在二进制可以解释他们。我们还发现,分布表明存在一个未观察到的占主导地位的人口的二进制SNe IIb在低金属丰度,由于开始在赫兹普龙间隙的质量转移。特别是,我们的模型表明存在一组高度剥离(包层质量~0.1-0.2 M_sun)的祖先,它们是紧凑的(<50 R_sun)和蓝色的(T_eff <~ 10^5K),具有~10^4.5-10^5.5 L_sun和低密度的星周介质。正如Sravan等人2019年所讨论的,该基团对于解释SN IIb组分是必要的,并且无论金属丰度如何,都可能存在。我们的模型所示的未观测到的人口的检测将支持弱恒星风和效率低下的质量转移在SN IIb祖。

英文摘要:

Type IIb supernovae (SNe IIb) present a unique opportunity for investigating the evolutionary channels and mechanisms governing the evolution of stripped-envelope SN progenitors due to a variety of observational constraints available. Comparison of these constraints with the full distribution of theoretical properties not only help ascertain the prevalence of observed properties in nature, but can also reveal currently unobserved populations. In this follow-up paper, we use the large grid of models presented in Sravan et al. 2019 to derive distributions of single and binary SNe IIb progenitor properties and compare them to constraints from three independent observational probes: multi-band SN light-curves, direct progenitor detections, and X-ray/radio observations. Consistent with previous work, we find that while current observations exclude single stars as SN IIb progenitors, SN IIb progenitors in binaries can account for them. We also find that the distributions indicate the existence of an unobserved dominant population of binary SNe IIb at low metallicity that arise due to mass transfer initiated on the Hertzsprung Gap. In particular, our models indicate the existence of a group of highly stripped (envelope mass ~0.1-0.2 M_sun) progenitors that are compact (<50 R_sun) and blue (T_eff <~ 10^5K) with ~10^4.5-10^5.5 L_sun and low density circumstellar mediums. As discussed in Sravan et al. 2019, this group is necessary to account for SN IIb fractions and likely exist regardless of metallicity. The detection of the unobserved populations indicated by our models would support weak stellar winds and inefficient mass transfer in SN IIb progenitors.

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