Monitoring the negative polarization in Comet 29P/Schwassmann–Wachmann during quiescence

Kochergin, Anton; Zubko, Evgenij; Chornaya, Ekaterina; Zheltobryukhov, Maxim; Videen, Gorden; Kornienko, G. I.; Kim, Sungsoo S.

doi:10.1016/j.icarus.2021.114536

Cited by 10 publications

(4 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Except for polarimetric observations of comets 29P/Schwassmann-Wachmann at r ≈ 5.9 au (Kochergin et al 2021) and C/2017 K2 (PANSTARRS) at r ≈ 6.8 au (Zhang et al 2022), there are no data on the polarization of comets with a perihelion distance beyond the orbit of Jupiter. We measured the linear polarization and created a map of its spatial distribution over the coma of comet C/2014 B1 at the record heliocentric distance of 9.6 au.…”

Section: Discussionmentioning

confidence: 99%

“…The polarization of the dust coma of the comet varied from the values typical of comets at a phase angle of 2.1 • , ranging from about -1% near the nucleus, to extremely large values of about -6.5% at distances of approximately 10 5 km from the nucleus. Typical values of the minimum polarization degree at the negative polarization branch for distant comets (within the range 7 > r > 4 au) are much higher (in absolute value; Dlugach et al 2018;Kochergin et al 2021;Ivanova et al 2019Ivanova et al , 2021 than the average value (P min ∼ -1.5%) observed for the dust coma of most comets closer to the Sun (Kiselev et al 2015). A comparison of the color and polarization maps shows that there is an unambiguous relationship between the changes of color and the degree of polarization, which could be the result of changes in the sizes and/or optical properties of the paricles.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Quasi-simultaneous photometric, polarimetric, and spectral observations of distant comet C/2014 B1 (Schwartz)

Ivanova

Rosenbush

Luk'yanyk

et al. 2023

A&A

View full text Add to dashboard Cite

Context. We analyze the results of our comprehensive observations of the high-perihelion comet C/2014 B1 (Schwartz) with stable disk-shaped coma and jets in order to study its nature. Aims. The main objective of our study is to obtain new observational results for a unique disk-like comet C/2014 B1 (Schwartz) with a perihelion distance of 9.56 au. Methods. Quasi-simultaneous long-slit spectra, as well as photometric and polarimetric images with g-sdss and r-sdss filters, were acquired with the 6 m telescope of the Special Astrophysical Observatory on 2017 January 23. The BVR-band photometry of the comet was also performed at the 2m telescope of the Peak Terskol Observatory on 2017 January 31. We modeled the dynamics of the jets and the behavior of the color and polarization in the coma considering the dust as aggregated large particles. Results. We did not reveal any emissions in the spectra. The positions of two jets oriented along the position angles of 179° and 350° and the disk-like shape of the coma have remained unchanged for more than 4 yr. The most realistic model able to explain jets of such stable orientation includes the existence of two active sources located near the north and south poles of the rotating nucleus whose diameter was determined to be between 7.6 and 12.2 km depending on the albedo, of namely between 0.1 and 0.04, respectively. The high activity of the comet is characterized by the high dust production Afρ which varied from 4440 to 3357 cm between 2017 January 23 and 31. A significant difference between the radial surface brightness profiles of the jets and the ambient (undisturbed by the jets) coma is found. The color of the jet structures is much redder than that of the ambient coma, and the nucleus has a very red color, V − R=0.93m±0.19m. There are spatial variations of the color and polarization over the coma and jets. Conclusions. The observed trends in color and polarization, as well as the brightness profiles, can be explained by the fragmentation of aggregated particles formed by CO2/H2O ices, silicates, and organics, which are of ~1 mm in radius near the nucleus and ~10 μm in radius at the periphery of the coma.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Quasi-simultaneous photometric, polarimetric, and spectral observations of distant comet C/2014 B1 (Schwartz)

Ivanova

Rosenbush

Luk'yanyk

et al. 2023

A&A

View full text Add to dashboard Cite

show abstract

“…At every pair of angles α and β, we repeat the measurements 3-5 times and compute the average value of the degree of linear polarization P and the standard deviation of the mean, quantifying the uncertainty in the results shown in Figures 2, 4-6. The polarimetric measurements of the twilight sky are conducted using the same algorithms used in previous polarimetric observations of comets (e.g., Zubko et al, 2020b;Chornaya et al, 2020;Zheltobryukhov et al, 2020;Kochergin et al, 2021).…”

Section: Technique Of Polarimetric Measurementsmentioning

confidence: 99%

“…Through in situ (e.g., Fomenkova et al, 1992;Ishii et al, 2008) and polarimetric studies of comets (e.g., Zubko et al, 2012;2016;2020b;Chornaya et al, 2020;Zheltobryukhov et al, 2020;Kochergin et al, 2021), their coma is populated by submicron and micron-sized dust particles, having Mg-rich silicate and carbonaceous-material composition. One can assume, therefore, either silicatecarbonaceous or solely carbonaceous chemical composition of the particles forming a meteor shower.…”

Section: Chemical Heterogeneity Of Aerosol Particlesmentioning

confidence: 99%

Characterizing atmospheric aerosols using polarimetry and shadow hiding

Zubko,

Zheltobryukhov,

Chornaya

et al. 2024

Front. Remote Sens.

Self Cite

View full text Add to dashboard Cite

Unpolarized sunlight is scattered by aerosols acquiring partial linear polarization. By aiming a ground-based detector vertically upward, it can record the polarimetric response of aerosols that are illuminated by the Sun. As the Sun sets, a portion of the sky is shadowed and the polarimetric response of the aerosols in the unshadowed region can be measured. This provides a means of scanning different portions of the atmospheric column with time. By comparing the measured polarimetric response with that of model agglomerated debris particles we can place constraints on the sizes and chemical composition of the aerosols in different portions of this column. We conducted a survey over 24 different epochs from April 2021 to December 2022, consisting of approximately 600 measurements of polarization of the atmosphere in twilight at the Ussuriysk Astrophysical Observatory. We found that most of the measurements correspond with water-ice particles or dust. However, on some occasions organic carbon dominated the measurements. These epochs correspond with increased fire seats in the region.

show abstract

The rise time of the change of cometary brightness during its outburst

Wesołowski

2022

Icarus

View full text Add to dashboard Cite

Monitoring the negative polarization in Comet 29P/Schwassmann–Wachmann during quiescence

Cited by 10 publications

References 35 publications

Quasi-simultaneous photometric, polarimetric, and spectral observations of distant comet C/2014 B1 (Schwartz)

Quasi-simultaneous photometric, polarimetric, and spectral observations of distant comet C/2014 B1 (Schwartz)

Characterizing atmospheric aerosols using polarimetry and shadow hiding

The rise time of the change of cometary brightness during its outburst

Contact Info

Product

Resources

About