二进制原行星盘的引力不稳定性；关于巨型行星形成的新约束
摘要
我们使用高分辨率 3D SPH 模拟来研究自引力二进制原行星盘的演化。包括冲击加热和冷却。我们考虑不同的轨道分离度和盘质量以及中心恒星的质量。孤立的质量盘(M ~ 0.1 M_{\odot})由于引力不稳定性在冷却时间可与轨道时间相当时破碎形成原行星。分离约为 60 AU 的二进制系统中不会发生破碎，因为由于强烈的潮汐诱导螺旋冲击引起的有效加热抑制了任何不均匀性。 resulting temperatures, above 200 K, would vaporize water ice in the outer disk, posing a problem even for the other model of giant planet formation, core-accretion. Light disks(M ~ 0.01 M_{\odot}) do not fragment but remain cold because their low self-gravity inhibits strong shocks. Core accretion would not be hampered in the latter. At separations of about 120 AU the efficiency of fragmentation by disk instability rises and approaches that in isolated systems. If disk instability is the main formation mechanism for giant planets, ongoing surveys targeting binary systems should find considerably fewer planets in systems with separations below 100 AU.
引用
@article{arxiv.astro-ph/0405502,
title = {Gravitational instability in binary protoplanetary disks; new constraints on giant planet formation},
author = {Lucio Mayer and James Wadsley and Thomas Quinn and Joachim Stadel},
journal= {arXiv preprint arXiv:astro-ph/0405502},
year = {2009}
}
备注
5 pages, 3 figures, submitted to MNRAS Letters