Polarization of disintegrating Comet C/2019 Y4 (ATLAS)

Polarization of disintegrating Comet C/2019 Y4 (ATLAS)

ABSTRACT 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...

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Veröffentlicht in:Monthly notices of the Royal Astronomical Society 2020-09, Vol.497 (2), p.1536-1542
Hauptverfasser: Zubko, Evgenij, Zheltobryukhov, Maxim, Chornaya, Ekaterina, Kochergin, Anton, Videen, Gorden, Kornienko, Gennady, Kim, Sungsoo S
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container_end_page 1542
container_issue 2
container_start_page 1536
container_title Monthly notices of the Royal Astronomical Society
container_volume 497
creator Zubko, Evgenij
Zheltobryukhov, Maxim
Chornaya, Ekaterina
Kochergin, Anton
Videen, Gorden
Kornienko, Gennady
Kim, Sungsoo S
description ABSTRACT 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).
doi_str_mv 10.1093/mnras/staa1725
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title Polarization of disintegrating Comet C/2019 Y4 (ATLAS)
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