Modeling Linear Polarization of the Didymos-Dimorphos System before and after the DART Impact

被引：0
|
作者：
Penttila, Antti [1 ]
Muinonen, Karri [1 ]
Granvik, Mikael [1 ,2 ]
Gray, Zuri [3 ,4 ]
Bagnulo, Stefano [3 ,4 ]
Kolokolova, Ludmilla [5 ]
Moreno, Fernando [6 ]
机构：
[1] Univ Helsinki, Dept Phys, POB 64, FI-00014 Helsinki, Finland
[2] Lulea Univ Technol, Asteroid Engn Lab, Box 848, SE-98128 Kiruna, Sweden
[3] Armagh Observ & Planetarium, Coll Hill, Armagh BT61 9DG, North Ireland
[4] UCL, London RH5 6NT, England
[5] Univ Maryland, Adelphi, MD 20742 USA
[6] Inst Astrofis Andaluca, CSIC, Glorieta Astron s-n, E-18008 Granada, Spain
来源：
PLANETARY SCIENCE JOURNAL | 2024年 / 5卷 / 01期
基金：
芬兰科学院;
关键词：
LIGHT-SCATTERING; RAY OPTICS; OLIVINE; PARTICLES; MATRICES;
D O I：
10.3847/PSJ/ad1757
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We analyze the polarization observations of the Didymos-Dimorphos system before and after the impact by the NASA Double Asteroid Redirection Test spacecraft on Dimorphos. We fit empirical polarization phase curve models and statistically confirm the discovery by Gray et al. about the degree of linear polarization of the system decreasing on the impact and remaining altered for at least 30 days post-impact. With numerical simulations of particles in the geometric optics domain, we estimate the dominant size of the particles either in the regolith of Didymos and Dimorphos or in the impact-driven ejecta cloud to be several hundred micrometers. The observed change between the pre-impact and post-impact systems indicates either a decrease in average particle size of some tens of micrometers or a decreased level of space weathering.
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页数：8
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