New peculiarities of cometary outburst activity

Filonenko, V. S.; Churyumov, K. I.

doi:10.1016/j.asr.2006.04.028

Cited by 13 publications

(13 citation statements)

References 2 publications

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“… Observations of cometary outbursts lead to the conclusion that there are no changes to the orbit in comets that undergo outbursts (Hughes 1990, 1991). This fact strongly supports the current model. Filonenko & Churyumov (2006) have shown that there is no close connection between the heliocentric distances of comets and their outburst activity. Indeed, heterogeneous cometary grains in different comets can contain a different percentage of CO inclusions.…”

Section: Discussionsupporting

confidence: 90%

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Large cometary grains - their destruction and changes in the luminosity of comets

Gronkowski

2009

Monthly Notices of the Royal Astronomical Society

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The catastrophic thermodynamic destruction of large cometary heterogeneous grains lying on the surface of a comet nucleus is examined. The core–mantle grain‐structure model is assumed. Grain fragmentation as an explanation of sudden changes in cometary brightness is proposed. The approach presented to the problem of cometary outbursts is a development of a previous author's paper. The proposed mechanism is based on the idea of thermodynamical destruction of heterogeneous cometary grains. Numerical simulations have been carried out for a wide range of values of physical characteristics of cometary material. The results obtained are consistent with observational data. The main conclusion of this paper is that thermodynamical fragmentation of large grains can explain variations in brightness and also outbursts of comets.

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Section: Discussionsupporting

confidence: 90%

“…Filonenko & Churyumov (2006) have shown that there is no close connection between the heliocentric distances of comets and their outburst activity. Indeed, heterogeneous cometary grains in different comets can contain a different percentage of CO inclusions.…”

Section: Discussionmentioning

confidence: 99%

Large cometary grains - their destruction and changes in the luminosity of comets

Gronkowski

2009

Monthly Notices of the Royal Astronomical Society

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“…The two last mentioned facts are strongly consistent with the recently paper of Filonenko & Churyumov (2006). According to these authors there is no close connection between the heliocentric distances of comets and their outburst activity, and the influence of solar activity on the frequency of outbursts is questionable.…”

Section: Discussionsupporting

confidence: 86%

The destruction of cometary grains and changes in the luminosity of comets

Gronkowski¹

2009

Astron Nachr

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One explanation of the sudden changes in the brightness of comets is proposed based on the author's earlier suggestions involving the fragmentation of cometary grains. Within the inner coma, a core-mantle model of the structure of grains is assumed. The proposed mechanism is a combination of electrostatic stress and thermodynamical fragmentation of the cometary grains water-ice mantle. It has been shown that the vapour pressure of volatile inclusions placed in the waterice mantle of grains can increase sufficiently to cause their fragmentation. It takes place before grains can completely sublime into the vacuum away. Numerical calculations have been carried out for a large range of values of probable physical characteristics of cometary material. The proposed approach yields increases in cometary brightness consistent with observations of typical cometary outbursts. It is concluded that this approach can provide an explanation of the sudden change in activity of comets for a wide range of heliocentric distances.

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“…The description of these phenomena is widely presented in the literature. For example, physical characteristics and the most frequently suggested hypotheses which try to explain the origin of these indications of cometary activity are presented in Richter (1954), Vsekhsviatskii (1966), Krésak (1974), Hughes (1991), Andrienko & Vashchenko (1981), Cochran, Cochran & Barker (1982), Cabot, Enzian & Klinger (1996), Gronkowski (2005a) and Filonenko & Churyumov (2006). Given the extensive literature, we here only briefly remind the reader of the following.…”

Section: Introductionmentioning

confidence: 99%

A model of cometary outbursts based on the idea of fragmentation of ice grains

Gronkowski

2007

Monthly Notices of the Royal Astronomical Society: Letters

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In this Letter the mechanism of destruction of ice grains as the cause of cometary outbursts and variations of brightness is reviewed. Such destruction can arise from the combination of two causes: inclusions of chemical compounds that are much more volatile than water‐ice placed inside cometary water‐ice grains; and the influence of the solar wind on such heterogeneous grains. Numerical calculations have been carried out for a large range of values of probable physical characteristics of cometary material. This approach gives a simulated increase in the cometary brightness that is consistent with the observed one. It is concluded that this mechanism is a probable and real explanation of the sudden activity of comets at a wide range of heliocentric distances.

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New peculiarities of cometary outburst activity

Cited by 13 publications

References 2 publications

Large cometary grains - their destruction and changes in the luminosity of comets

Large cometary grains - their destruction and changes in the luminosity of comets

The destruction of cometary grains and changes in the luminosity of comets

A model of cometary outbursts based on the idea of fragmentation of ice grains

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