EXTREME AO OBSERVATIONS OF TWO TRIPLE ASTEROID SYSTEMS WITH SPHERE

EXTREME AO OBSERVATIONS OF TWO TRIPLE ASTEROID SYSTEMS WITH SPHERE
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两个球体三重小行星系统的极端AO观测

DOI：
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发表时间：
2016
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通讯作者：
F. Vachier
F. Vachier
中科院分区：
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作者：
B. Yang;Z. Wahhaj;L. Beauvalet;F. Marchis;C. Dumas;M. Marsset;E. Nielsen;F. Vachier

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本文介绍了利用光谱-偏振高对比度系外行星研究/甚大望远镜获得的多个历元的微分成像和积分场光谱数据中发现的一颗新的小行星卫星--S/2014(130)1。这颗新的(第二颗)Elektra小卫星直径约2公里，在偏心轨道上，距离主星约500公里。为了进行比较研究，我们还观察到了另一个三重小行星系统--(93)密涅瓦。对于这两个系统，同时获得了卫星和初级卫星的分量分辨反射光谱。对于这两个三元系统，卫星和主星之间没有明显的光谱差异。我们发现，这两个系统中的小卫星更有可能是由次破坏性撞击产生的，而不是被捕获的。
We present the discovery of a new satellite of asteroid (130) Elektra—S/2014 (130) 1—in differential imaging and in integral field spectroscopy data over multiple epochs obtained with Spectro-Polarimetric High-contrast Exoplanet Research/Very Large Telescope. This new (second) moonlet of Elektra is about 2 km across, on an eccentric orbit, and about 500 km away from the primary. For a comparative study, we also observed another triple asteroid system, (93) Minerva. For both systems, component-resolved reflectance spectra of the satellites and primary were obtained simultaneously. No significant spectral difference was observed between the satellites and the primary for either triple system. We find that the moonlets in both systems are more likely to have been created by sub-disruptive impacts as opposed to having been captured.