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Polarization of disintegrating Comet C/2019 Y4 (ATLAS)
Monthly Notices of the Royal Astronomical Society ( IF 4.7 ) Pub Date : 2020-06-19 , DOI: 10.1093/mnras/staa1725
Evgenij Zubko 1 , Maxim Zheltobryukhov 2 , Ekaterina Chornaya 2, 3 , Anton Kochergin 2, 3 , Gorden Videen 1, 4 , Gennady Kornienko 2 , Sungsoo S Kim 1, 5
Affiliation  

We observe Comet C/2019 Y4 (ATLAS) before and after its disintegration while making polarimetric measurements over a wide range of phase angles. The disintegration event was marked with a dramatic growth of the positive polarization branch that is consistent with a large relative abundance of absorbing material of up to (96.5 ± 3.4) per cent. This polarization spike relaxed as the carbonaceous particles are preferentially swept from the coma due to solar-radiation pressure. The observations suggest that the primordial material stored within comets is extremely rich in carbonaceous material. The pristine cometary material is processed by subsequent solar interactions, forming a refractory crust on the nucleus surface. Polarimetry provides a means of measuring the volume ratio of carbonaceous material, and hence the weathering that has occurred on the comet due to these interactions. The polarimetric response of Comet C/2019 Y4 (ATLAS) appears similar to that of Comet C/1995 O1 (Hale-Bopp), except on few epochs that are similar to that of Comet C/1996 B2 (Hyakutake).

中文翻译:

分解彗星C / 2019 Y4(ATLAS)的极化

我们观察彗星C / 2019 Y4(ATLAS)的解体前后,同时在很宽的相角范围内进行极化测量。崩解事件的标志是正极化分支急剧增长,这与吸收材料的相对大丰度高达(96.5±3.4)%相一致。当碳质颗粒由于太阳辐射压力而优先从昏迷中扫除时,这种极化尖峰放松了。这些观察结果表明,储存在彗星中的原始物质中碳质物质非常丰富。原始的彗星材料通过随后的太阳相互作用进行加工,在核表面形成难熔的硬皮。旋光法提供了一种测量碳质材料体积比的方法,因此,由于这些相互作用,在彗星上发生了风化。C / 2019 Y4彗星(ATLAS)的极化响应似乎与C / 1995 O1彗星(Hale-Bopp)相似,只是在几个与C / 1996 B2彗星(Hyakutake)相似的时期外。
更新日期:2020-08-03
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