First determination of the temperature of a lunar impact flash and its evolution
First determination of the temperature of a lunar impact flash and its evolution
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首次测定月球撞击闪光的温度及其演化
DOI：
10.1093/mnras/sty1862
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发表时间：
2018
影响因子：
4.8
通讯作者：
N. Morales
中科院分区：
文献类型：
--
作者：
J. Madiedo;J. L. Ortiz;N. Morales
我们首次对流星体撞击月球表面产生的闪光进行了分析，并在近红外和可见光下记录了这一闪光。尽管在我们手稿的裁判过程中，其他团队最近也公布了类似的数据(Bonanos等人)。2018年)，我们的结果仍然形成了对望远镜撞击月球闪光温度的第一次测量(Madiedo和Ortiz 2016,2018)。闪电的峰值震级在近红外I波段为5.1$\pm$0.3，在可见光波段为7.3$\pm$0.2，在这两个波段的总持续时间分别为0.20 S和0.18 S。对流星体的起源进行了调查，我们推断最有可能的情况是撞击器属于零星背景。对这一事件的分析首次估计了零星流星体撞击月球的近红外辐射效率。我们测得这一效率比可见光波段高出约56%，并且我们发现在初始阶段的最高撞击羽流温度约为4000K，然后在峰值亮度之后的温度约为3200K。撞击产生的陨石坑的大小也被计算了出来。
We report the first analysis of a flash produced by the impact of a meteoroid on the lunar surface and recorded both in the near-infrared and in the visible. Despite the fact that similar data have been recently published by other team during the refereeing process of our manuscript (Bonanos et al. 2018), our result still forms the first measurement of the temperature of a telescopic lunar impact flash (Madiedo and Ortiz 2016, 2018). The flash exhibited a peak magnitude of 5.1 $\pm$ 0.3 in the near-infrared I band and 7.3 $\pm$ 0.2 in the visible, and the total duration of the event in these bands was 0.20 s and 0.18 s, respectively. The origin of the meteoroid was investigated, and we inferred that the most likely scenario is that the impactor that belonged to the sporadic background. The analysis of this event has provided for the first time an estimation of the emission efficiency in the near-infrared {\eta}I for sporadic meteoroids impacting the Moon. We have determined that this efficiency is around 56% higher than in the visible band and we have found a maximum impact plume temperature of ~4000 K at the initial phase followed by temperatures of around 3200 K after the peak brightness. The size of the crater produced as a consequence of this impact is also calculated.