寻找已久的共包络事件的识别
Identification of the Long-Sought Common-Envelope Events
摘要：
共同包层事件（CEE），即两颗恒星暂时在一个共同的包层内运行，被认为是形成大范围近距离双星的关键。几十年来，CEE实际发生的唯一证据是间接的，基于无法以其他方式解释的系统的存在。在这里，我们提出了一个直接的观测签名CEE所产生的物理模型中，从物质的发射在CEE喷射控制的重组前的物质冷却。这个模型的时间尺度和能量的自然范围，以及预期的颜色，光曲线形状，喷射速度和事件率，与最近公认的一类红色瞬态爆发相匹配。
英文摘要：
Common-envelope events (CEEs), during which two stars temporarily orbit within a shared envelope, are believed to be vital for the formation of a wide range of close binaries. For decades, the only evidence that CEEs actually occur has been indirect, based on the existence of systems that could not be otherwise explained. Here we propose a direct observational signature of CEE arising from a physical model where emission from matter ejected in a CEE is controlled by a recombination front as the matter cools. The natural range of timescales and energies from this model, as well the expected colors, light-curve shapes, ejection velocities and event rate, match those of a recently-recognized class of red transient outbursts.
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