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arXiv 2408.02836astro-ph.EP
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DART撞击抛射物向火星和地球的输送:流星观测的机会

Delivery of DART Impact Ejecta to Mars and Earth: Opportunity for Meteor Observations

Eloy Peña-Asensio, Michael Küppers, Josep M. Trigo-Rodríguez, Albert Rimola

AI总结:

本研究通过模拟DART撞击抛射物的动力学,发现其抛射物可能在7至13年内到达火星和地球,为流星观测提供了预测和特征信息。

摘要:

NASA的DART和ESA的Hera任务提供了一个独特的机会来研究撞击抛射物向其他天体的输送。我们使用300万个粒子进行了抛射物动力学模拟,这些粒子被分为三个尺寸群体(10 cm、0.5 cm和30 $μ$m),并受到撞击后早期的LICIACube观测的约束。主模拟探索了1到1,000 m/s的抛射物速度,而辅助模拟则专注于速度在1到2 km/s之间的更快抛射物。我们确定了与向火星和地球输送产生流星的粒子相兼容的DART抛射物轨道。我们的结果表明,对于约450 m/s的发射速度(在观测范围内),抛射物有可能在13年内到达火星希尔球。一些以770 m/s发射的抛射物粒子可能在7年内到达火星附近。更快的抛射物导致向火星输送的通量更高,并且粒子以高于1.5 km/s的速度撞击地球希尔球。输送过程对初始观测到的锥体范围略微敏感,并由会合周期驱动。向火星输送物质的发射位置主要位于DART撞击点的北部,而对于地月系统则显示出西南方向的倾向。较大的粒子表现出到达火星的概率略高,而较小的粒子则更有利于输送到地月系统,尽管这种影响不显著。为了支持对DART产生的流星的观测活动,我们提供了关于相遇特征(轨道根和辐射点)的全面信息,并量化了释放的流星体的轨道退相干程度。

英文摘要:

NASA's DART and ESA's Hera missions offer a unique opportunity to investigate the delivery of impact ejecta to other celestial bodies. We performed ejecta dynamical simulations using 3 million particles categorized into three size populations (10 cm, 0.5 cm, and 30 $μ$m) and constrained by early post-impact LICIACube observations. The main simulation explored ejecta velocities ranging from 1 to 1,000 m/s, while a secondary simulation focused on faster ejecta with velocities from 1 to 2 km/s. We identified DART ejecta orbits compatible with the delivery of meteor-producing particles to Mars and Earth. Our results indicate the possibility of ejecta reaching the Mars Hill sphere in 13 years for launch velocities around 450 m/s, which is within the observed range. Some ejecta particles launched at 770 m/s could reach Mars's vicinity in 7 years. Faster ejecta resulted in a higher flux delivery towards Mars and particles impacting the Earth Hill sphere above 1.5 km/s. The delivery process is slightly sensitive to the initial observed cone range and driven by synodic periods. The launch locations for material delivery to Mars were predominantly northern the DART impact site, while they displayed a southwestern tendency for the Earth-Moon system. Larger particles exhibit a marginally greater likelihood of reaching Mars, while smaller particles favor delivery to Earth-Moon, although this effect is insignificant. To support observational campaigns for DART-created meteors, we provide comprehensive information on the encounter characteristics (orbital elements and radiants) and quantify the orbital decoherence degree of the released meteoroids.

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