标题： 盘状形成和喷流倾斜度在共同包层中的影响 显示英文标题

标题： Disk formation and jet inclination effects in Common Envelopes

摘要： 共同包层（CE）阶段的演化和物理机制仍然不完全清楚。 在此阶段，从致密天体发射的喷流可能会决定双星系统的演化结果。 我们关注的是喷流从被红巨星（RG）外层包裹的中子星（NS）发射的情况。 我们运行了一系列不同光度和倾角的三维流体动力学模拟。 喷流的光度由质量吸积率和一个效率$\eta$自动调节。 根据$\eta$的值，喷流可以突破BHL膨胀区（“成功喷流”），并相对于流入的风对齐，反过来，它会重新对齐以有利于风的方向。 喷流的大小和方向会发生变化，并可能表现出平静期和活跃期。 喷流的倾角以及科里奥利力和离心力仅略微影响整体演化。 由于吸积是超临界的，且比角动量高于形成盘的临界值，我们推断形成了盘并发射了喷流。 盘的质量和大小将是$\sim$10$^{-2}$~M$_\odot$和$\gtrsim 10^{10}$cm，它可能具有不同旋转方向的环。 为了从白矮星发射成功喷流，喷射过程需要非常高效（$\eta\sim$0.5）。 对于主序星来说，没有足够的能量库来发射成功的喷流。 显示英文摘要

摘要： The evolution and physics of the common envelope (CE) phase are still not well understood. Jets launched from a compact object during this stage may define the evolutionary outcome of the binary system. We focus on the case in which jets are launched from a neutron star (NS) engulfed in the outer layers of a red giant (RG). We run a set of three-dimensional hydrodynamical simulations of jets with different luminosities and inclinations. The luminosity of the jet is self-regulated by the mass accretion rate and an efficiency $\eta$. Depending on the value of $\eta$ the jet can break out of the BHL bulge ("successful jet") and aligns against the incoming wind, in turn, it will realign in favour of the direction of the wind. The jet varies in size and orientation and may present quiescent and active epochs. The inclination of the jet and the Coriolis and centrifugal forces, only slightly affect the global evolution. As the accretion is hypercritical, and the specific angular momentum is above the critical value for the formation of a disk, we infer the formation of a disk and launching of jets. The disks' mass and size would be $\sim$10$^{-2}$~M$_\odot$ and $\gtrsim 10^{10}$ cm, and it may have rings with different rotation directions. In order to have a successful jet from a white dwarf, the ejection process needs to be very efficient ($\eta\sim$0.5). For main sequence stars, there is not enough energy reservoir to launch a successful jet.