Abstract
We present the results obtained from photometric and polarimetric observation of a Jupiter family comet 32P/Comas Sola, and a Oort cloud comet C/2015 V2 (Johnson), observed on February 20, 2015 (post-perihelion) and December 30, 2016 (pre-perihelion), at phase angles 9.8∘ and 21.6∘. Both the comets show a diffuse coma in the intensity map which extends towards the tailward direction. To study the morphological structures of both the comets, intensity images are treated with digital filters. A V-shaped structure is noticed in the antisolar direction of comet 32P/Comas Sola which appears due to radial outflow of dust from the nucleus. The comet C/2015 V2 (Johnson) shows some structures with fan-shaped fine jets in the antisolar direction. It is also noticed that intensity is found to be higher in the tailward direction as compared to sunward direction in both comets. The average polarization value is estimated to be (\(-1.0\pm 0.7\))% at aperture radius ∼ 13,500 km for comet 32P/Comas Sola and (\(-0.4 \pm 0.7\))% at aperture radius ∼ 12,600 km for comet C/2015 V2 (Johnson). The observed polarization values obtained from this work are compared with other comets at almost similar phase angles which showed a satisfactory agreement within the framework of the estimated errors in polarization.
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Data Availability
The optical polarimetry data of two comets will be shared on a reasonable request to the corresponding author.
Code Availability
Not applicable.
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Acknowledgements
We would like to acknowledge the Aryabhatta Research Institute of observational sciencES (ARIES), Nainital for making telescope time available. We sincerely acknowledge the reviewer of this paper for constructive comments and suggestions which definitely helped to improve the quality of the paper.
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Mazarbhuiya, A.M., Das, H.S., Medhi, B.J. et al. Study of dust coma of comets 32P/Comas Sola and C/2015 V2 (Johnson) by imaging polarimetry. Astrophys Space Sci 367, 98 (2022). https://doi.org/10.1007/s10509-022-04133-7
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DOI: https://doi.org/10.1007/s10509-022-04133-7