共同的信封演变：我们的立场和我们如何向前迈进
Common Envelope Evolution: Where we stand and how we can move forward
摘要：
这项工作旨在展示我们目前对共同包络演化（CEE）的最佳物理理解。我们强调共识和分歧的领域，并强调应指明在这一重要但长期存在和基本上未解决的问题上取得进展的方向的想法。与中东欧相关工作不同的是，我们大多会尽量避免依赖人口合成或观察的结果，以避免可能被之前的误解所误导。我们尽可能地从物理学出发讨论所有相关的问题，从CEE开始之前的双星系统的演化到可能发生在信封弹出之后的过程。特别是，我们包括广泛的讨论能源和汇在中东欧地区的运作，因此检查的基础上的标准能源形式主义。特别注意的是，还比较了不同群体的水动力模拟结果，并讨论了初始条件对结果差异的潜在影响。我们比较目前的数值技术的问题CEE，也是否更合适的工具可以和应该产生（包括新的配方计算流体力学，并试图包括三维过程中的一维代码）。最后，我们探索新的方法来连接CEE与观察。我们比较以前的模拟CEE最近爆发的V1309斯科，并讨论在何种程度上后共同信封双星和星云可以提供信息，例如，从二进制偏心率，这是目前没有得到充分利用。
英文摘要：
This work aims to present our current best physical understanding of common-envelope evolution (CEE). We highlight areas of consensus and disagreement, and stress ideas which should point the way forward for progress in this important but long-standing and largely unconquered problem. Unusually for CEE-related work, we mostly try to avoid relying on results from population synthesis or observations, in order to avoid potentially being misled by previous misunderstandings. As far as possible we debate all the relevant issues starting from physics alone, all the way from the evolution of the binary system immediately before CEE begins to the processes which might occur just after the ejection of the envelope. In particular, we include extensive discussion about the energy sources and sinks operating in CEE, and hence examine the foundations of the standard energy formalism. Special attention is also given to comparing the results of hydrodynamic simulations from different groups and to discussing the potential effect of initial conditions on the differences in the outcomes. We compare current numerical techniques for the problem of CEE and also whether more appropriate tools could and should be produced (including new formulations of computational hydrodynamics, and attempts to include 3D processes within 1D codes). Finally we explore new ways to link CEE with observations. We compare previous simulations of CEE to the recent outburst from V1309 Sco, and discuss to what extent post-common-envelope binaries and nebulae can provide information, e.g. from binary eccentricities, which is not currently being fully exploited.
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