论文标题
在近日
Electrostatic Dust Ejection From Asteroid (3200) Phaethon With the Aid of Mobile Alkali Ions at Perihelion
论文作者
论文摘要
尽管流星阵雨通常与周期性彗星的活性相关，但已知小行星（3200）Phaethon是双子座的母体。小行星最特殊的是它在每个近周期通过微米尺寸的灰尘颗粒射出的彗星样活动，而小行星的活性从未在$ 0.14〜 \ mathrm {au} $的近乎层面区域以外鉴定出来。从理论的角度来看，我们认为小行星的活性是通过高温下的移动碱离子的静电倾斜来很好地解释的。在我们模型中，小行星中微米大小的颗粒的质量降低速率与从Phaethon尘埃尾部的可见观察结果推断出的值完全一致。对于毫米大小的颗粒，我们预测三个幅度的较高质量较高的质量率，这也可以通过静电倾斜机制来解释Geminid Meteoroid流的总质量。
The asteroid (3200) Phaethon is known to be the parent body of the Geminids, although meteor showers are commonly associated with the activity of periodic comets. What is most peculiar to the asteroid is its comet-like activity in the ejection of micrometer-sized dust particles at every perihelion passage, while the activity of the asteroid has never been identified outside the near-perihelion zone at $0.14~\mathrm{au}$ from the Sun. From the theoretical point of view, we argue that the activity of the asteroid is well explained by the electrostatic lofting of micrometer-sized dust particles with the aid of mobile alkali ions at high temperatures. The mass-loss rates of micrometer-sized particles from the asteroid in our model is entirely consistent with the values inferred from visible observations of Phaethon's dust tail. For millimeter-sized particles, we predict three orders of magnitudes higher mass-loss rates, which could also account for the total mass of the Geminid meteoroid stream by the electrostatic lofting mechanism.
