谷歌浏览器插件
订阅小程序
在清言上使用

Disc formation and jet inclination effects in common envelopes

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY(2020)

引用 32|浏览9
暂无评分
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 previously formed 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 disc, we infer the formation of a disc and launching of jets. The discs' mass and size would be similar to 10(-2) M-circle dot and greater than or similar to 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 similar to 0.5). For main-sequence stars, there is not enough energy reservoir to launch a successful jet.
更多
查看译文
关键词
accretion, accretion discs,hydrodynamics,methods: numerical,binaries: close,binaries: general
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要