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arXiv 1807.01904astro-ph.EP
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妊神星尘埃环的动力学

Dynamics of Haumea's dust ring

Tamás Kovács, Zsolt Regály

摘要:

对最近观测到的矮行星妊神星环的粒子动力学进行了数值研究。考虑了质点引力、二阶重力场和太阳辐射压作为主要扰动。环的准静止状态对于不同的微米尺寸的颗粒是不同的,并且还取决于主体的旋转速率和尘埃粒子的轨道周期之间的自旋-轨道共振。模拟证实了在运输进出期间观察到的环的可变径向宽度。结果表明,微米级晶粒,最初的圆形轨道,成为偏心,并形成一个apse-aligned环在所观察到的径向距离接近3:1自旋轨道共振。同时也证明了这种符合只是表面上的,与3:1共振无关.

英文摘要:

The particle dynamics of the recently observed ring around dwarf planet Haumea is numerically investigated. The point mass gravitational force, a second degree and order gravity field, and the solar radiation pressure as the main perturbations are considered. The quasi-stationary state of the ring varies for different micron-sized grains and depends also on the spin-orbit resonances between the rotation rate of the main body and the orbital period of the dust particles. The simulations confirm the variable radial width of the ring observed during the transit ingress and egress. Results show that the micron sized grains, initially on circular orbits, become eccentric and form an apse-aligned ring at the observed radial distance near to the 3:1 spin-orbit resonance. It is also demonstrated that this coincidence is only apparent and independent of 3:1 resonance.

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