首个多信使新星：T CrB 下一次爆发中的外部激波、TeV 光子和中微子

中文摘要 AI 辅助

北冕座T是最引人注目的预期银河系再发新星，也是检验新星爆发能否成为真正多信使瞬变源的最佳机会之一。近期对经典新星的观测研究表明，GeV γ射线光度与相互作用外流之间的微分速度密切相关，表明激波功率强烈依赖于速度对比度。我们将这一经验框架应用于T CrB，并与2021年RS Ophiuchi的爆发进行比较，后者是唯一在TeV能量下被可靠探测到的新星。我们认为T CrB可能处于新星种群中极高Δv端，其最强激波应产生于新星抛射物与缓慢的环双星介质之间的外部相互作用。这使得外部激波成为任何TeV发射最可能的场所，而GeV信号可能包含内部（若存在）和外部激波的贡献。由于T CrB比RS Oph近得多，它是TeV探测特别有利的目标。中微子情况很有前景但更不确定，因为它敏感地依赖于环双星物质的密度和结构。我们还重新审视了T CrB的再发时间。利用采样更好的再发新星的观测离散度，我们推断出代表性种群尺度的再发周期为T_rec≃80±12年。综合来看，其近距离和潜在极端激波速度使T CrB可能成为新星成为首个确凿多信使新星的最佳机会。

英文摘要

T Coronae Borealis is the most compelling anticipated Galactic recurrent nova and one of the best opportunities to test whether nova eruptions can become genuine multi-messenger transients. Recent observational work on classical novae has shown that the GeV $γ$-ray luminosity correlates strongly with the differential velocity between interacting outflows, suggesting that shock power depends strongly on velocity contrast. We apply this empirical framework to T CrB and compare it with the 2021 eruption of RS Ophiuchi, the only nova securely detected at TeV energies. We argue that T CrB may lie at the extreme high-$Δv$ end of the nova population and that its strongest shock should arise at the external interaction between the nova ejecta and the slow circumbinary medium. This makes the external shock the most likely site of any TeV emission, while the GeV signal may contain contributions from both internal, if present, and external shocks. Because T CrB is substantially closer than RS Oph, it is an especially favorable target for TeV detection. The neutrino case is promising but more uncertain because it depends sensitively on the density and structure of the circumbinary material. We also revisit the recurrence time of T CrB. Using the observed scatter of better-sampled recurrent novae, we infer a representative population-scale recurrence of $T_{\rm rec}\simeq80\pm12$ yr. Taken together, its proximity and potentially extreme shock velocities make T CrB perhaps the best opportunity for a nova to become the first securely established multi-messenger nova.

发表机构

• Texas Tech University（德克萨斯理工大学）
• Michigan State University（密歇根州立大学）
• Naval Research Laboratory（海军研究实验室）
• INAF-Osservatorio Astronomico di Capodimonte（意大利国家天体物理研究所卡波迪蒙特天文台）
• National Radio Astronomy Observatory（美国国家射电天文台）
• Columbia University（哥伦比亚大学）
• Flatiron Institute（平顶山研究所）
• University of Virginia（弗吉尼亚大学）
• NASA/GSFC（美国宇航局戈达德太空飞行中心）
• University of Maryland, Baltimore County（马里兰大学巴尔的摩县分校）
• University of California, Berkeley（加州大学伯克利分校）

机构由 AI 辅助整理，请以论文原文为准。

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10 pages, 1 figure, 1 table (submitted to MNRAS)