Decimeter-scale particle characterization in the coma of 73P/Schwassmann-Wachmann 3 using dual-wavelength radar observations

Virkki, Anne; Zubko, Evgenij; Nolan, M. C.; Howell, E. S.; Benner, L. A. M.; Harmon, J. K.

doi:10.1016/j.icarus.2019.02.009

Cited by 12 publications

(8 citation statements)

References 35 publications

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“…In the calculations, we adopted a constant power-law index of q = 2.1, (Zubko et al 2016). It should be clearly emphasized that the value of the power factor in the size distribution is a function of the radius of the dust particle (Virrki et al 2019). Furthermore, such a power index is consistent with the range detected in situ in the 1P/Halley coma in submicron and micron-sized particles (Mazets et al 1986).…”

Section: Thermodynamic Parameters and Amplitude Of The Outburstsupporting

confidence: 82%

The role of astronomical silicates during a cometary outburst^⋆

Wesołowski

2021

Res. Astron. Astrophys.

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This paper presents a new approach to analyzing the change of cometary brightness. In our considerations, we assume that astronomical silicates (dust agglomerates) and gas are present in the coma. This assumption is a consequence of the analysis of the result observed during the Rosetta mission to comet 67P/Churyumov-Gerasimenko (abbreviated 67P/Ch-G). The dimensions of these agglomerates can be up to several centimeters. However, the large ones are few compared to particles with dimensions of several micrometers. This paper presents the results of calculations on the change in hypothetical comet brightness as a result of its outburst. The calculations take into account the percentage of carbonaceous particles and silicates rich in magnesium.

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Section: Thermodynamic Parameters and Amplitude Of The Outburstsupporting

confidence: 82%

The role of astronomical silicates during a cometary outburst^⋆

Wesołowski

2021

Res. Astron. Astrophys.

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“…Overall, water activity alone appears to be insufficient for the ejection of larger boulders and other mechanisms are most likely at work at the same time. Previous works have investigated different types of accelerating mechanism of dust particles around other cometary nuclei (Reach et al 2009;Virkki et al 2019). In particular, the source area is a confirmed site of strong CO 2 emission around the time of the observations (Läuter et al 2019), whose sublimation flux at a lower temperature of 105 K would already be sufficient to lift boulders of 0.5 m in radius (Huebner et al 2006;Reach et al 2009).…”

Section: Discussionmentioning

confidence: 99%

Diurnal Ejection of Boulder Clusters on Comet 67P Lasting beyond 3 au

Shi,

Hu,

Agarwal

et al. 2024

ApJL

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Ejection of large boulder-like debris is a vigorous form of cometary activity that is unlikely induced by water ice out-gassing alone but rather associated with the sublimation of super-volatile ices. Though perceived on several comets, the actual pattern and mechanism of such activity are still unclear. Here we report on a specialized observation of ejections of decimeter- to meter-sized boulders on comet 67P/Churyumov-Gerasimenko outbound between 2.5 and 3.3 au from the Sun. With a common source region, these events recurred in local morning. The boulders of elongated shapes were ejected in clusters at low inclinations comparable to the solar elevation below 40° at the time. We show that these chunks could be propelled by the surrounding asymmetric gas field that produced a distinct lateral acceleration. Possibly both water and carbon dioxide have contributed to their mobilization, while the season and local topography are among deciding factors. The mechanisms for sustaining regular activity of comets at large heliocentric distances are likely more diverse and intricate than previously thought.

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“…In situ studies of comets suggest a power-law size distribution of their dust particles r −n , with the index n ranging from 1.5 to 3 at r < 10 µm (Mazets et al 1986;Price et al 2010). It is worth noting that the power index tends to increase with r, up to n = 4.8 in decimeter-sized particles (Virkki et al 2019).…”

Section: Properties Of the Color Slopementioning

confidence: 98%

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

Lukyanyk

Zubko

Videen

et al. 2020

A&A

Self Cite

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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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Decimeter-scale particle characterization in the coma of 73P/Schwassmann-Wachmann 3 using dual-wavelength radar observations

Cited by 12 publications

References 35 publications

The role of astronomical silicates during a cometary outburst^⋆

The role of astronomical silicates during a cometary outburst^⋆

Diurnal Ejection of Boulder Clusters on Comet 67P Lasting beyond 3 au

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

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Decimeter-scale particle characterization in the coma of 73P/Schwassmann-Wachmann 3 using dual-wavelength radar observations

Cited by 12 publications

References 35 publications

The role of astronomical silicates during a cometary outburst ⋆

The role of astronomical silicates during a cometary outburst ⋆

Diurnal Ejection of Boulder Clusters on Comet 67P Lasting beyond 3 au

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

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Product

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The role of astronomical silicates during a cometary outburst^⋆

The role of astronomical silicates during a cometary outburst^⋆