Imaging polarimetry of comet 73P/Schwassmann–Wachmann 3 main fragments during its 2006 apparition

Hadamcik, Edith; Levasseur-Regourd, Anny Chantal

doi:10.1016/j.pss.2015.12.012

Cited by 7 publications

(6 citation statements)

References 46 publications

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“…Hellyer 1970). Spectroscopic observations of the above-mentioned comet indicate no strong differences in composition between the fragments (Dello Russo et al 2007;Schleicher & Bair 2011), though clues to possible differences in the dust properties, which might give an insight on different properties of inner sub-nuclei, were noticed (Hadamcik Levasseur-Regourd 2016). These observations could be consistent with the hypothesis that cometary nuclei fragments represent primordial blocks of the accretion of comets.…”

Section: Cometary Nuclei Interior Structuresupporting

confidence: 67%

CONSERT constrains the internal structure of 67P at a few metres size scale

Ciarletti

Hérique

Lasue

et al. 2017

Monthly Notices of the Royal Astronomical Society

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The internal properties of cometary nuclei are the best clues to the size distribution and properties of the early planetesimals that formed the planets during the early Solar system nebula processes. The CONSERT radar was designed to probe the interior of comet 67P/Churyumov-Gerasimenko with a wavelength of about 3 m. It was successfully operated during the First Science Sequence of the Rosetta mission when the CONSERT's wave propagated through part of the nucleus' small lobe. The shape of the received signals provides some hints about the internal structure of the comet's small lobe. The limited broadening observed on the received pulses is compared to simulations performed on a series of non-homogeneous nucleus models to put constrains on the potential structures at the wavelength's scale. The study allows to exclude structures showing a permittivity contrast larger than 0.25 inside the sounded part of the nucleus at a few metres size scale.

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Section: Cometary Nuclei Interior Structuresupporting

confidence: 67%

CONSERT constrains the internal structure of 67P at a few metres size scale

Ciarletti

Hérique

Lasue

et al. 2017

Monthly Notices of the Royal Astronomical Society

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“…Our polarimetric data showed an inhomogeneity in the inner coma, displaying the highest-P d r around 5 ′′ -7 ′′ (corresponding to 5 -6 × 10 3 km from the nucleus, Figure 3-(b)). Similar structures were found by the flyby Giotto / Optical Probe Experiment (OPE) of comet 1P/Halley (Levasseur-Regourd et al 1999) and other groundbased observations of comet 73P/Schwassmann-Wachmann 3 (Jones et al 2008;Hadamcik & Levasseur-Regourd 2016). Hereafter, we will address the possible mechanisms underlying this distribution based on our observational results described in Section 3.…”

Section: Inner Coma Polarizationsupporting

confidence: 76%

Optical and Near-infrared Polarimetry of Non-periodic Comet C/2013 US10 (Catalina)

Kwon

Ishiguro

Kuroda

et al. 2017

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We present an optical and near-infrared (hereafter NIR) polarimetric study of a comet C/2013 US10 (Catalina) observed on UT 2015 December 17-18 at phase angles of α=52.1 • -53.1 • . Additionally, we obtained an optical spectrum and multi-band images to examine the influence of gas emission. We find that the observed optical signals are significantly influenced by gas emission, that is, the gas-to-total intensity ratio varies from 5 to 30 % in the R C and 3 to 18 % in the I C bands, depending on the position in the coma. We derive the 'gas-free dust polarization degrees' of 13.8±1.0 % in the R C and 12.5±1.1 % in the I C bands and a gray polarimetric color, i.e., -8.7±9.9 % µm −1 in optical and 1.6±0.9 % µm −1 in NIR. The increments of polarization obtained from the gas correction show that the polarimetric properties of the dust in this low-polarization comet are not different from those in high-polarization comets. In this process, the cometocentric distance dependence of polarization has disappeared. We also find that the R C -band polarization degree of the southeast dust tail, which consists of large dust particles (100 µm-1 mm), is similar to that in the outer coma where small and large ones are mixed. Our study confirms that the dichotomy of cometary polarization does not result from the difference of dust properties, but from depolarizing gas contamination. This conclusion can provide a strong support for similarity in origin of comets.

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“…However, as the optocentric distance increases the integrated polarization stabilizes before decreasing when the signal/noise becomes smaller. This property is well illustrated by Hadamcik and Levasseur-Regourd (2016) on comet 73P/Schwassmann-Wachmann 3.…”

Section: Introductionmentioning

confidence: 60%

“…Study of polarization properties of different comets may also provide classification of comets and understanding the main processes of dust formation in the protosolar nebula. In addition, polarimetric characteristics of comets may indicate differences in the properties of dust on the surface and inside of nuclei through observations of jets and different fragments of comets ( Kiselev et al, 2002;Hadamcik and Levasseur-Regourd, 2016 ). For these purposes, we conduct systematic polarimetric observations of comets that are available for our instruments.…”

Section: Introductionmentioning

confidence: 99%