Extremely low linear polarization of comet C/2018 V1 (Machholz–Fujikawa–Iwamoto)

Zubko, Evgenij; Chornaya, Ekaterina; Zheltobryukhov, Maxim; Matkin, A.; Ivanova, Oleksandra; Bodewits, Dennis; Kochergin, Anton; Kornienko, G. I.; Lukyanyk, I. V.; Hines, Dean C.; Videen, Gorden

doi:10.1016/j.icarus.2019.113453

Cited by 10 publications

(7 citation statements)

References 38 publications

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“…While particle alignment can produce non-zero U, it should be ruled out for producing nonzero U at α = 18.1° because it would produce a similar non-zero value at other phase angles. However, this contradicts our measurements of 46P (see Table 2) and other comets (e.g., Chornaya et al 2020a;Zubko et al 2020). As one can see, P is solely governed by the Q parameter, suggesting a vanishingly small contribution of the U component.…”

Section: Aperture-averaged Degree Of Linear Polarization In Comet 46pcontrasting

confidence: 90%

“…In Fig. 2, we plot the degree of linear polarization P Q as a function of phase angle α in comet 46P/Wirtanen versus what was measured with the broadband V filter in other comets; C/1975 V1 (West) as reported by Kiselev and Chernova (1978), 21P/Giacobini-Zinner measured in the 1985 apparition by Kurchakov et al (1986) and in the 2018 apparition by Chornaya et al (2020a), and C/2018 V1 (Machholz-Fujikawa-Iwamoto) adapted from Zubko et al (2020). Clearly, polarization of dust in comet 46P/Wirtanen is considerably lower as compared to 21P/Giacobini-Zinner and it better corresponds with the case of C/2018 V1 (Machholz-Fujikawa-Iwamoto).…”

Section: Aperture-averaged Degree Of Linear Polarization In Comet 46p/wirtanenmentioning

confidence: 91%

“…Two other comets were 21P/Giacobini-Zinner and C/2018 V1 (Machholz-Fujikawa-Iwamoto). Their detailed investigations have been reported by Chornaya et al (2020a) and Zubko et al (2020). All three comets were observed using the same telescope, standard stars, and data-reduction technique.…”

Section: Polarimetrymentioning

confidence: 99%

“…Coma in such comets is predominantly populated by weakly absorbing particles (Zubko et al, 2016). On the other hand, a low-P max comet is a rare object (e.g., Zubko et al, 2020). It is worth noting, however, that the polarimetric response in 46P/Wirtanen also closely resembles what was previously detected in comet C/1975 V1 (West) with the broadband V filter, but at significantly larger aperture (~80,000 km) (Kiselev and Chernova 1978).…”

Section: Conclusion Remarksmentioning

confidence: 99%

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Monitoring polarization in comet 46P/Wirtanen

Zheltobryukhov

Zubko

Chornaya

et al. 2020

Monthly Notices of the Royal Astronomical Society

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We measure the degree of linear polarization of comet 46P/Wirtanen during two months, embracing the perihelion passage in December, 2018 with phase angles ranging from α = 18.1° to 46.4°. The polarimetric response PQ obtained resembles what was previously found in comet C/1975 V1 (West). This suggests 46P/Wirtanen belongs to a group of comets with high maximum positive polarization. In the first half of February of 2019, we conducted BVRI photometry of 46P/Wirtanen and found either neutral or blue colour of its dust, which is in good accordance with measurements of C/1975 V1 (West). While aperture-averaged polarimetry of 46P/Wirtanen reveals a nearly zero polarization PQ at the lowest phase angle α = 18.1°, simultaneous imaging polarimetry suggests that the negative polarization (PQ < 0) arises in a region of within 5,000 km of the nucleus, where the negative polarization could be as strong as PQ = –(1.44 ± 0.15) per cent. This observation suggests the existence of the circumnucleus halo and that the coma is populated by at least two types of dust particles. One of those reveals a low positive polarization at side scattering and high negative polarization near backscattering. Both polarimetric features are simultaneously produced by weakly absorbing Mg-rich silicate particles. Another type of dust produces solely positive polarization that could be attributed to carbonaceous particles. This composition of 46P/Wirtanen coma appears to be similar with what was previously found in comet C/1975 V1 (West).

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Section: Aperture-averaged Degree Of Linear Polarization In Comet 46pcontrasting

confidence: 90%

Section: Aperture-averaged Degree Of Linear Polarization In Comet 46p/wirtanenmentioning

confidence: 91%

Section: Polarimetrymentioning

confidence: 99%

Section: Conclusion Remarksmentioning

confidence: 99%

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Monitoring polarization in comet 46P/Wirtanen

Zheltobryukhov

Zubko

Chornaya

et al. 2020

Monthly Notices of the Royal Astronomical Society

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“…This implies that within the cometocentric distances of ∼1000 km used in Luk'yanyk et al 2019, only ∼1.3% of the C 2 progenitors dissociate (see, e.g., discussion of Eq. (5) in Zubko et al 2020a). When considering the largest aperture used in Boehnhardt et al (2020), that is a radius of 5000 km, the amount of dissociated C 2 parents increases to only 6.1%.…”

Section: Introductionmentioning

confidence: 99%

Resolving color differences of comet 41P/Tuttle-Giacobini-Kresák

Lukyanyk

Zubko

Videen

et al. 2020

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Three different measurement campaigns have resulted in three drastically different sets of color measurements of Comet 41P/Tuttle-Giacobini-Kresák, ranging from a strongly red to a strongly blue color. Although the color slope is normalized to the wavelength range between the filters used, this only serves to partially normalize the resulting color, as the reflectance of cometary dust has a very strong dependence on particle absorption, which may change significantly over the wavelength range of measurement. We demonstrate that the different measurements are physical and are consistent with real materials; for example, we are able to reproduce the color measured during one epoch in which both strong blue and red color slopes were measured almost simultaneously in different filter sets with the mineral dust pyroxene. Such measurements with different filter sets serve as an additional constraint in modeling dust properties.

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Photometric BVR observations of comet C/2012 J1 (Catalina) before and after perihelion

Betzler

Sousa

2023

Astron Nachr

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We analyzed the BVR photometry of comet C/2012 J1 (Catalina) taken between March 2013 and May 2014 with telescopes ranging from 0.20 to 2.0 m aperture in Australia, Europe, and the United States. We found an absolute magnitude in the R-band of H 0 = 7.2 ± 0.1 measured with a photometric aperture radius 𝜌 of 42.4 arcsec, corresponding to projected distances in the sky of 7.2 × 10 4 -1.5 × 10 5 km. Comet C/2012 J1 (Catalina) shows an asymmetric secular light curve, which is typical for comets. The nucleus has a minimum radius of 3.3 km admitting an albedo of 0.04. The inner coma exhibited radial pulsations before perihelion related to the dust rate proxy Af𝜌. The Af𝜌 parameter was inversely proportional to the photometric aperture radius 𝜌 because the angular diameter of the coma was small compared with the aperture radii used. The comet had three outbursts with brightness variations between 0.2 and 2.99 magnitudes per event. The median normalized reflectivity gradient S ′ is 4.4 with an amplitude of 22.9%/100 nm in the spectral range between 440 and 647 nm. The dispersion of the gradient S ′ means that 20% of the measurements are bluer than the solar color.

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Extremely low linear polarization of comet C/2018 V1 (Machholz–Fujikawa–Iwamoto)

Cited by 10 publications

References 38 publications

Monitoring polarization in comet 46P/Wirtanen

Monitoring polarization in comet 46P/Wirtanen

Resolving color differences of comet 41P/Tuttle-Giacobini-Kresák

Photometric BVR observations of comet C/2012 J1 (Catalina) before and after perihelion

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