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arXiv 1206.5841astro-ph.EP
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外海王星双星的KCTF演化:连接形成与观测

KCTF Evolution of Trans-Neptunian Binaries: Connecting Formation to Observation

Simon Porter, William Grundy

摘要:

最近对海王星外双星(TNB)系统的观测调查大大增加了已知相互轨道的数量。我们对人工合成的跨海王星双星的Kozai周期潮汐摩擦(KCTF)模拟表明,这些系统中的潮汐耗散可以完全重塑它们的原始轨道。具体来说,太阳扭矩应该大大加速了原始(或最近激发)TNB的半长轴衰变和圆化时间尺度。因此,我们在模拟中最初随机分布的TNB演变为具有大量紧密圆形轨道。这种紧密的圆形人口出现在一系列TNO物理特性中,尽管强大的引力四极可以阻止一些完全圆形化。我们引入了一个稳定性参数来预测KCTF在TNB轨道上的有效性,并证明了一些已知的TNB必须有一个大的引力四极杆才能稳定。

英文摘要:

Recent observational surveys of trans-neptunian binary (TNB) systems have dramatically increased the number of known mutual orbits. Our Kozai Cycle Tidal Friction (KCTF) simulations of synthetic trans-neptunian binaries show that tidal dissipation in these systems can completely reshape their original orbits. Specifically, solar torques should have dramatically accelerated the semimajor axis decay and circularization timescales of primordial (or recently excited) TNBs. As a result, our initially random distribution of TNBs in our simulations evolved to have a large population of tight circular orbits. This tight circular population appears for a range of TNO physical properties, though a strong gravitational quadrupole can prevent some from fully circularizing. We introduce a stability parameter to predict the effectiveness of KCTF on a TNB orbit, and show that a number of known TNBs must have a large gravitational quadrupole to be stable.

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