Spatial variations of brightness, colour and polarization of dust in comet 67P/Churyumov–Gerasimenko

Rosenbush, V. K.; Ivanova, Oleksandra; Kiselev, N. N.; Kolokolova, L.; Afanasiev, V. L.

doi:10.1093/mnras/stx2003

Cited by 49 publications

(54 citation statements)

References 60 publications

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“…Snodgrass et al 2016). The two main curved jets are described for 2015-2016 apparition by Knight et al (2017), Boehnhardt et al (2016 and Rosenbush et al (2017). The main jet remained close to the solar direction, curved and extended on the sky though it was progressively fading.…”

Section: Evolution Of the 67p Post-perihelion Morphologymentioning

confidence: 88%

“…It has been already discussed in the Section 3.3, that cometary colour index can also be expressed as the 'spectral slope' or 'normalised spectral reflectivity'. Rosenbush et al (2017) mentioned that normalised colour index, measured as % per 100 nm, is often referred to as the dust colour index or reddening and accordingly they have reported the reddening (or spectral slope) of the coma to be about 8.2 %/100 nm in G-R wavelength range at the 33.2 degree phase angle of the comet, for observation during 2015-16. They also reported a reddening of 12.5 ± 2 % per 100 nm in November 2015, in the B-I domain and concluded that the particles were large compared to the wavelength.…”

Section: Colour Index and Dust Properties In 67p Comparedmentioning

confidence: 99%

“…We found a higher reddening of about 0.40 mag. Rosenbush et al (2017) tried to interpret the correlated variations of polarization and colour index by numerical simulations of the scattered light. The authors used a model of polydisperse spherical particles with a power-law size distribution with sizes between 0.1µm to 1 mm.…”

Section: Colour Index and Dust Properties In 67p Comparedmentioning

confidence: 99%

“…The other one seems to originate from the same region, but it is curved towards the north (e.g. Hadamcik et al 2016 for HST and HCT observations; Rosenbush et al 2017;Knight et al 2017). The remote observations during the encounter help to understand the behaviour of the dust at large cometary distances.…”

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confidence: 99%

“…We will use some of the recent publications for discussions, together with results from Rosetta (e.g. Hadamcik et al 2016) and various publications on the colour of the dust such as Bertini et al (2017) and Frattin et al (2017), and also Rosenbush et al (2017) with colour and polarization maps obtained at different dates after perihelion.…”

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confidence: 99%

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Photometry and colour index of Comet 67P/Churyumov-Gerasimenko on 2015 December 12

Sen

Hadamcik

Botet

et al. 2019

Monthly Notices of the Royal Astronomical Society

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Comet 67P/Churyumov-Gerasimenko (hereafter, 67P) was observed on 12 December 2015, from 2 m Himalayan Chandra Telescope in India in photometry to study its dust properties, using Bessell R and I filters. We study the photometric images to highlight coma structures and jets. The radial decrease in intensity in the different coma structures are compared to the azimuthally integrated intensities. The observations of the slopes show a quasi-steady-state coma to an optocentric distance of about 20 000 km. The change in the slopes in the structures indicates changing properties of the dust particles and/or change in their local size distributions. Comparison of the radial decrease in the two wavelengths suggests a change in the local colour-index. Based on the absolute photometry carried out in the present work, we calculate the reddening of the comet dust which helps to characterize variations in the size and the materials of the particles. The colour-index is calculated for different apertures and regions in the coma (0.40 ± 0.07 mag) for a 22000 diameter aperture. A colour map is constructed showing the variation of the colour-index through the coma. Changes appear at the transition between the coma and the tail with a low colour-index (< 0.3 mag) close to the optocentre and further away increasing up in the tail direction (about 0.45 mag at 10 000 km). We interpret these changes in terms of dust properties and we compare our results to other remote observations of 67P including in situ Rosetta observations.

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Section: Evolution Of the 67p Post-perihelion Morphologymentioning

confidence: 88%

Section: Colour Index and Dust Properties In 67p Comparedmentioning

confidence: 99%

Section: Colour Index and Dust Properties In 67p Comparedmentioning

confidence: 99%

mentioning

confidence: 99%

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confidence: 99%

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