标题： Ib型超新星双星起源的种群合成研究 显示英文标题

标题： Population Synthesis Study on the Binary Origin of Type Ibn Supernovae

摘要： Ib型超新星（SNe Ib）是一类超新星爆炸，其前身星周围被密集的富氦星周物质（CSM）所包围。一些模型已被提出用于形成这种密集的CSM，有前景的情景包括具有低质量（$\lesssim 3~M_\odot$）氦星（He）的双星系统，或者氦星与致密天体经历公共包层阶段后的合并。利用快速双星人群合成计算，我们估计了这些通道的事件率，并将其与观测到的SNe Ib事件率进行了比较。我们发现，在近距离双星系统（分离距离为$\lesssim$，几倍100$R_\odot$）中爆炸的低质量氦星可以足够多地产出，以解释观测到的SNe Ib事件率，而合并情景可能只能解释其中的一部分。我们讨论了在低质量氦星情景下预期的伴星类型，发现典型的伴星是大质量主序星（$10$–$20\ M_\odot$），并且可能存在一定比例（$<10\%$）的具有白矮星伴星的双星系统，其延迟时间长达$100$百万年。 显示英文摘要

摘要： Type Ibn supernovae (SNe) are a class of SN explosions whose progenitors are surrounded by dense helium-rich circumstellar matter (CSM). Some models have been proposed for how to form the dense CSM, with promising scenarios involving either binaries with a low-mass ($\lesssim 3~M_\odot$) helium (He) star, or mergers following common envelope phases between a He star and a compact object. Using rapid binary population synthesis calculations, we estimate the event rate of these channels and compare it with the observed SN Ibn rate. We find that exploding low-mass He stars in close binaries (of separations $\lesssim$ a few 100 $R_\odot$) can be sufficiently produced to account for the observed event rate of SN Ibn, while the merger scenario can likely account for only a fraction of these SNe. We discuss the types of companions expected in the low-mass He star scenario, finding massive main sequence stars ($10$--$20\ M_\odot$) to be typical, with a potentially non-negligible fraction ($<10\%$) of binaries with WD companions that have long delay times of up to $100$ Myrs.