Imaging polarimetry and photometry of comet 21P/Giacobini-Zinner

Status Report From: e-Print archive
Posted: Tuesday, December 29, 2020

E. Chornaya E. Zubko, I. Luk'yanyk, A. Kochergin, M. Zheltobryukhov, O.V. Ivanova, G. Kornienko, A. Matkin, A. Baransky, I.E. Molotov, V.S. Sharoshchenko, G. Videen

We report results of polarimetric observations of comet 21P/Giacobini-Zinner made at phase angles, {\alpha}=76-78 deg, between 10 and 17 of September 2018, and compare them with previous measurements. We find significant variations in the polarimetric signals that appear consistent with those reported previously. These variations and subsequent modeling suggest that the particles in the coma are replenished within a period of approximately one day. This period is significantly shorter for highly absorbing carbonaceous particles than for non-absorbing Mg-rich silicate particles. Such a difference in the relative abundances of these components can lead to variations in the polarization response of the coma. The strong positive polarization in the subsolar direction suggests a large relative abundance of carbonaceous material, which may be an indicator of jet-type activity.

Comments: 11 pages, 6 figures

Subjects: Earth and Planetary Astrophysics (astro-ph.EP)

DOI: 10.1016/j.icarus.2019.113471

Cite as: arXiv:2012.13208 [astro-ph.EP] (or arXiv:2012.13208v1 [astro-ph.EP] for this version)

Submission history

From: Oleksandra Ivanova 

[v1] Thu, 24 Dec 2020 11:57:57 UTC (2,390 KB)

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