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28 March 2024 |
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Polarimetry of comets 67P/Churyumov-Gerasimenko, 74P/Smirnova-Chernykh, and 152P/Helin-Lawrence | A. Stinson
; S. Bagnulo
; G.P. Tozzi
; H. Boehnhardt
; S. Protopapa
; L. Kolokolova
; K. Muinonen
; G.H. Jones
; | Date: |
16 Jun 2016 | Abstract: | Aims. Polarimetric characteristics of comets at large heliocentric distances
is a relatively unexplored area; we extend the idea by adding and analysing the
data for three Jupiter family comets (JFCs).
Methods. With the FORS2 instrument of the ESO VLT, we performed
quasi-simultaneous photometry and polarimetry of three active JFCs
67P/Churyumov-Gerasimenko, 74P/Smirnova-Chernykh, and 152P/Helin-Lawrence.
Results. We obtained in total 23 polarimetric measurements at different
epochs, covering a phase-angle range ~1 -16 degrees and heliocentric distances
from 3 to 4.6 au. From our observations we obtained both colour and
polarimetric maps to look for structures in the comae and tails of the comets.
Conclusions. 74P/Smirnova-Chernykh and 152P/Helin-Lawrence exhibit enough
activity at large heliocentric distances to be detectable in polarimetric
measurements. Polarimetric and colour maps indicate no evidence of dust
particle | Source: | arXiv, 1606.5192 | Services: | Forum | Review | PDF | Favorites |
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