The role of the energy equation in the fragmentation of protostellar discs during stellar encounters
The role of the energy equation in the fragmentation of protostellar discs during stellar encounters
复制标题
能量方程在恒星相遇过程中原恒星盘破碎中的作用
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
UK.
中科院分区：
文献类型：
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作者：
G. Lodato;F. Meru;C. Clarke;W. I. O. Astronomy;Cambridge;UK Supa;Institute for Astronomy;Edinburgh;UK.
在这篇文章中，我们使用高分辨率光滑粒子流体动力学(SPH)模拟来研究边缘稳定的自引力原恒星盘与伴星无盘恒星的近距离抛物线相遇的响应。我们的主要目标是测试密闭的棕矮星或大质量行星是否可以从这些圆盘的碎裂中形成。我们通过包括压缩和冲击加热的影响以及一个简单的冷却处方来跟踪圆盘的热演变，并发现与以前的等温模拟结果相反。在目前的情况下，我们发现，由于潮汐加热的强烈作用，碎裂被相互作用抑制，从而导致圆盘的强烈稳定。先前也在涉及二进制系统中的盘的其他模拟中观察到了类似的行为。与孤立圆盘的情况一样，碎裂的条件似乎最终取决于冷却速度。
In this paper, we use high-resolution smoothed particle hydrodynamics (SPH) simulations to investigate the response of a marginally stable self-gravitating protostellar disc to a close parabolic encounter with a companion discless star. Our main aim is to test whether close brown dwarfs or massive planets can form out of the fragmentation of such discs. We follow the thermal evolution of the disc by including the effects of heating due to compression and shocks and a simple prescription for cooling and find results that contrast with previous isothermal simulations. In the present case we find that fragmentation is inhibited by the interaction, due to the strong effect of tidal heating, which results in a strong stabilization of the disc. A similar behaviour was also previously observed in other simulations involving discs in binary systems. As in the case of isolated discs, it appears that the condition for fragmentation ultimately depends on the cooling rate.