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CCD polarimetry of distant comets C/2010 S1 (LINEAR) and C/2010 R1 (LINEAR) at the 6-m telescope of the SAO RAS | Oleksandra V. Ivanova
; Janna M. Dlugach
; Viktor L. Afanasiev
; Volodymyr M. Reshetnyk
; Pavlo P. Korsun
; | Date: |
26 Jun 2015 | Abstract: | We present first measurements of the degree of linear polarization of distant
comets C/2010 S1 (LINEAR) and C/2010 R1 (LINEAR) at heliocentric distances r=
5.9 - 7.0 AU. Observations were carried out with the SCORPIO-2 focal reducer at
the 6-m telescope of the SAO RAS. Both comets showed considerable level of
activity beyond a zone where water ice sublimation is negligible (up to 5 AU).
Significant spatial variations both in the intensity and polarization are found
in both comets. The slope of radial profiles of intensity changes gradually
with the distance from the photocenter: from - 0.7 near the nucleus up to about
- 1.3 for larger distances (up to 100000 km). The variation in polarization
profiles indicates the non uniformity in the polarization distribution over the
coma. The polarization degree over the coma gradually increases (in absolute
value) with increasing the photocentric distance from of about - 1.9% up to -
3% for comet C/2010 S1 (LINEAR), and from of about - 2.5% up to - 3.5% for
comet C/2010 R1 (LINEAR). These polarization values are significantly higher
than typical value of the whole coma polarization (-1.5%) for comets at
heliocentric distances less than 5 AU. The obtained photometric and
polarimetric data are compared with those derived early for other comets at
smaller heliocentric distances. Numerical modeling of light scattering
characteristics was performed for media composed of particles with different
refractive index, shape, and size. The computations were made by using the
superposition T-matrix method. We obtained that for comet C/2010 S1 (LINEAR),
the dust in the form of aggregates of overall radius R ~ 1.3 {mu}m composed of
N = 1000 spherical monomers with radius a = 0.1 {mu}m, refractive index m =
1.65 + i 0.05, allows to obtain a satisfactory agreement between the results of
polarimetric observations of comet C/2010 S1 and computations. | Source: | arXiv, 1506.7986 | Services: | Forum | Review | PDF | Favorites |
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