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arXiv 2402.12977astro-ph.SRastro-ph.HE
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来自不同初始间距的双星前身星的Ib型、IIb型、II-L型和II-P型超新星序列

A sequence of Type Ib, IIb, II-L, and II-P supernovae from binary-star progenitors of varying initial separation

Luc Dessart, Claudia P. Gutierrez, Andrea Ercolino, Harim Jin, Norbert Langer

AI总结:

该研究通过辐射流体力学与时变辐射转移模拟,揭示大质量双星初始轨道周期差异是Ib、IIb、II-L、II-P型超新星多样性的根源,同时指出星周物质作用等因素是模型与观测偏差的可能原因。

摘要:

在过去十年中,越来越多的证据表明大质量恒星通常并非孤立演化,而是在走向核心坍缩的过程中与伴星共同经历剧烈的演化历程。尽管洛希瓣外流(Roche-lobe overflow)似乎对大部分Ib型和Ic型超新星(SNe)的产生至关重要,但大质量相互作用双星的初始轨道周期Pinit的变化也可能产生多种多样的B、BC或C型演化情形,使得超新星前身星拥有从微薄到丰厚的富氢包层。本文聚焦初始质量为12.6倍太阳质量(Msun)的主星即供体星的爆炸过程,采用辐射流体力学和非局部热动平衡(NLTE)时变辐射转移方法,记录了这类从Ib型、IIb型、II-L型到II-P型超新星的气体和辐射特性。初始轨道周期Pinit的差异是我们所得到的超新星光变曲线呈现多样形态的根本原因,在V波段表现出单峰、双峰、快速下降或平台状等不同形态。不同的抛射物结构、膨胀速率以及相对丰度(例如氢、氦、56Ni)导致了谱线形状(吸收与发射的强度、宽度)和演化过程的高度多样性。我们强调,氢α(Halpha)是追踪这些变化的关键示踪物,而HeI 7065是诊断氦元素存在的持久光学探针。我们的模拟网格与代表性的Ib型、IIb型和IIP型超新星吻合良好,但本研究未考虑的星周物质相互作用,很可能是我们的IIL型超新星模型与观测结果(例如SN 2006Y)存在差异的原因。我们的模型在达到热极大值的上升时间上仍存在偏差,这要求我们必须恰当考虑核心坍缩超新星抛射物中的小尺度和大尺度结构。那些具有高平台亮度但谱线宽度较窄的IIP型超新星模型偏差,或许可以通过采用更致密的红超巨星前身星来解决。

英文摘要:

Over the last decade, evidence has accumulated that massive stars do not typically evolve in isolation but instead follow a tumultuous journey with a companion star on their way to core collapse. While Roche-lobe overflow appears instrumental for the production of a large fraction of supernovae (SNe) of Type Ib and Ic, variations in the initial orbital period Pinit of massive interacting binaries may also produce a wide diversity of case B, BC, or C systems, with preSN stars endowed from minute to massive H-rich envelopes. Focusing here on the explosion of the primary, donor star, originally of 12.6Msun, we use radiation-hydrodynamics and NLTE time-dependent radiative transfer to document the gas and radiation properties of such SNe, covering from Type Ib, IIb, II-L to II-P. Variations in Pinit are the root cause behind the wide diversity of our SN light curves, with single-peak, double-peak, fast-declining or plateau-like morphologies in the V band. The different ejecta structures, expansion rates, and relative abundances (e.g., H, He, 56Ni) are conducive to much diversity in spectral line shapes (absorption vs emission strength, width) and evolution. We emphasize that Halpha is a key tracer of these modulations, and that HeI7065 is an enduring optical diagnostic for the presence of He. Our grid of simulations fare well against representative SNe Ib, IIb, and IIP SNe, but interaction with circumstellar material, which is ignored in this work, is likely at the origin of the tension between our Type IIL SN models and observations (e.g., SN2006Y). Remaining discrepancies in our model rise time to bolometric maximum call for a proper account of both small-scale and large-scale structures in core-collapse SN ejecta. Discrepant Type IIP SN models, with a large plateau brightness but small line widths, may be cured by adopting more compact red-supergiant star progenitors.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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