Formation of C2 and CN in nova V2676 Oph around its visual brightness maximum
Formation of C2 and CN in nova V2676 Oph around its visual brightness maximum
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nova V2676 Oph 在其视觉亮度最大值附近形成 C2 和 CN
DOI：
10.1093/pasj/psu150
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
A. Arai
中科院分区：
文献类型：
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作者：
H. Kawakita;M. Fujii;M. Nagashima;T. Kajikawa;Natsuki Kubo;A. Arai
慢新星V2676Oph的独特之处在于，C2和CN分子都在其视觉亮度峰值附近的早期阶段被观测到。用光谱技术检测到这些分子的吸收带，并在几天内消失。CO的形成之后是尘埃的形成，这在新星后期的观测中得到了证实。分子的形成对于理解新星中尘埃粒子的起源是至关重要的；然而，新星早期C2和CN分子的形成机制尚不清楚。在这里，我们报告了在早期阶段对形成尘埃的新星V2676 Oph的光学光谱观测，除了先前报道的光谱观测之外，我们还使用这些数据来讨论新星中双原子分子的起源。我们的结论是，当外部气体包层充分冷却时，C2和CN分子在新星流出中形成，它们在新星流出中存活超过2天，但不到7天。
The slow nova V2676 Oph was unique in that both C2 and CN molecules were observed during its early phase around the visual brightness maximum. The absorption bands of these molecules were detected using spectroscopic techniques and disappeared within several days. The formation of CO was followed by dust formation, which was confirmed via observations in the latter phase of the nova. The formation of molecules is critically important in understanding the origin of dust grains in novae; however, the formation mechanism of C2 and CN molecules in the early phase of novae remain unclear. Here we report optical spectroscopic observations of the dust-forming nova V2676 Oph in the early phase, and we use these data in addition to spectroscopic observations reported previously to discuss the origin of diatomic molecules in the nova. We conclude that C2 and CN molecules formed in the nova outflow when the outer gas envelope cooled sufficiently and that they survived for more than 2 days but less than 7 days in the nova outflow.