SN 2024abvb：一种具有氦证据的Ibn/Icn型超新星，其与宿主星系存在极端偏移
SN 2024abvb: a Type Ibn/Icn supernova with evidence of helium and an extreme offset from its host galaxy
AI总结：
SN 2024abvb是一种具有氦证据的Ibn/Icn型超新星，其与宿主星系存在极端偏移，光谱和光度特征显示其独特的演化模式。
摘要：
我们提供了SN 2024abvb的光谱和光度观测及分析，这是一种奇特的过渡型Ibn/Icn型超新星，位于其宿主星系异常大的投影距离（21.5kpc）处。SN 2024abvb在g-和o-波段显示出延长的上升时间（分别10.1和10.6天），随后在所有光度波段中线性下降。与其他超新星子类的比较显示，SN 2024abvb的光度和光谱演变与Ibn和Icn事件不同，具有更高的r波段峰值光度和较低的黑体温度。光谱显示初始蓝色连续谱和窄P-Cygni轮廓，C ii λ5890在发射中占主导地位，持续到晚期阶段，并显示出膨胀速度的快速下降。在早期时间检测到弱He i λ5876特征。对前身场景的分析排除了热核起源，因为光度曲线形状和光谱特征不兼容。由于本地恒星形成率低，罕见的大质量恒星前身似乎不太可能。最可能的起源是涉及双星系统的超新星，这最好解释了观察到的与宿主的距离、低周围星尘质量、快速光度演变和低镍产量，尽管模型与观测抛射物质量之间存在矛盾。这些结果强化了将SN 2024abvb归类为独特的Ibn/Icn事件，并突显了相互作用超新星的前身通道的多样性。
英文摘要：
We present spectroscopic and photometric observations and analysis of SN 2024abvb, a peculiar transitional Type Ibn/Icn supernova located at an unusually large projected distance from its host galaxy (21.5 kpc). SN 2024abvb displays an extended rise time in the $g$- and $o$-bands (10.1 and 10.6 days respectively), followed by a linear decline in all photometric bands. Comparisons with other supernova subclasses show that the photometric and spectroscopic evolution of SN 2024abvb are distinct from Type~Ibn and Type Icn events, with a higher peak $r$-band luminosity and lower blackbody temperatures. Spectra reveal an initial blue continuum and narrow P-Cygni profiles, with C {\sc ii} $λ$5890 dominating in emission, persisting at late phases, and showing a rapid decline in the expansion velocity. Weak He {\sc i} $λ$5876 features are tentatively detected at early times. Analysis of progenitor scenarios rules out thermonuclear origins based on incompatible light curve shapes and spectral signatures. A rare massive star progenitor appears unlikely given the low local star formation rate. The most plausible origin is an ultra-stripped supernova scenario involving a binary system; this best explains the observed separation from the host, the low circumstellar material mass, the fast photometric evolution and the low nickel production, although a discrepancy in model versus observed ejecta mass remains. These results reinforce the classification of SN 2024abvb as a distinctive Type Ibn/Icn event and highlight the diversity of progenitor channels for interacting supernovae.
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