First determination of the temperature of a lunar impact flash and its evolution

DOI: 
10.1093/mnras/sty1862
Publication date: 
01/07/2018
Main author: 
Madiedo, José M.
IAA authors: 
Ortiz, José L.;Morales, Nicolás
Authors: 
Madiedo, José M.;Ortiz, José L.;Morales, Nicolás
Journal: 
Monthly Notices of the Royal Astronomical Society
Refereed: 
Yes
Publication type: 
Article
Pages: 
1777
Abstract: 
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 ± 0.3 in the near-infrared I band and 7.3 ± 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 η<SUB>I</SUB> for sporadic meteoroids impacting the Moon. We have determined that this efficiency is around 56 per cent 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.
Database: 
ADS
URL: 
https://ui.adsabs.harvard.edu/#abs/2018MNRAS.480.5010M/abstract
ADS Bibcode: 
2018MNRAS.480.5010M
Keywords: 
Impact processes;impact flash;Moon;meteoroids;meteors