Bipolar planetary nebulae from outflow collimation by common envelope evolution
Bipolar planetary nebulae from outflow collimation by common envelope evolution
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DOI：
10.1093/mnras/staa2145
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发表时间：
2019-12
影响因子：
4.8
通讯作者：
Yangyuxin Zou;A. Frank;Zhuo Chen;T. Reichardt;O. De Marco-O.-De Marco-2124556154;E. Blackman;J. Nordhaus;B. Balick;J. Carroll-Nellenback;L. Chamandy;Baowei Liu
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文献类型：
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作者：
Yangyuxin Zou;A. Frank;Zhuo Chen;T. Reichardt;O. De Marco-O.-De Marco-2124556154;E. Blackman;J. Nordhaus;B. Balick;J. Carroll-Nellenback;L. Chamandy;Baowei Liu
双极行星状星云（PNe）的形态可以归因于来自中央发动机的快速风与共同包层（CE）演化留下的致密环形喷出物之间的相互作用。在这里，我们使用的3-D流体动力AMR代码AstroBEAR研究的可能性，双极PN流出可以出现准直，甚至从一个未准直的球形风在CE事件的后果。通过SPH代码PHANTOM的单个CE模拟的输出用作初始条件。四个案件的风，都有足够高的动量占观察到的高动量行星际前星云流出，被注入到喷出物的CE二进制残留区域的球形。我们比较的情况下，两种不同的动量和情况下，没有辐射冷却与应用程序的光学薄发射通过冷却曲线的流出。我们的模拟结果表明，在所有情况下，高度准直的双极流出的结果，通过与CE喷出物的相互作用的球形风偏转。在所有情况下，都可以看到顶叶和底叶之间的显著不对称。辐射冷却的低动量情况下的不对称性最强。虽然真实的后CE风可能是非球面的，我们的模型表明，通过“惯性约束”准直将足够强大，甚至开始与最大的非准直驱动器创建射流一样的外流。我们的模拟揭示了详细的冲击聚焦惯性约束（SFIC）模型中的冲击结构，并开发了一个透镜形的内部冲击，这是一个新的功能SFIC驱动的双极叶。
The morphology of bipolar planetary nebulae (PNe) can be attributed to interactions between a fast wind from the central engine and dense toroidal shaped ejecta left over from common envelope (CE) evolution. Here we use the 3-D hydrodynamic AMR code AstroBEAR to study the possibility that bipolar PN outflows can emerge collimated even from an uncollimated spherical wind in the aftermath of a CE event. The output of a single CE simulation via the SPH code PHANTOM serves as the initial conditions. Four cases of winds, all with high enough momenta to account for observed high momenta preplanetary nebula outflows, are injected spherically from the region of the CE binary remnant into the ejecta. We compare cases with two different momenta and cases with no radiative cooling versus application of optically thin emission via a cooling curve to the outflow. Our simulations show that in all cases highly collimated bipolar outflows result from deflection of the spherical wind via the interaction with the CE ejecta. Significant asymmetries between the top and bottom lobes are seen in all cases. The asymmetry is strongest for the lower momentum case with radiative cooling. While real post CE winds may be aspherical, our models show that collimation via "inertial confinement" will be strong enough to create jet-like outflows even beginning with maximally uncollimated drivers. Our simulations reveal detailed shock structures in the shock focused inertial confinement (SFIC) model and develop a lens-shaped inner shock that is a new feature of SFIC driven bipolar lobes.