Laboratory investigation of the sublimation of comet nucleus models

Ibadinov, Kh. I.

doi:10.1016/0273-1177(89)90248-2

Cited by 16 publications

(13 citation statements)

References 10 publications

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“…We note that the maximum is obtained near (r −q) ≈ 0. This result confirms Dobrovolsky & Gerasimenko (1987) and Ibadinov (1998) conclusions, that the maximum number of splitting of comets occurs near perihelion. We obtain similar results for the abnormal tails of comets: in Fig.…”

Section: Introductionsupporting

confidence: 90%

“…To achieve this purpose, we we have created two catalogues. The first includes 99 comets for which nuclear splitting, or obvious signs of splitting have been recorded; it is a continuation of similar catalogues of Konopleva (1967), Golubev (1975, Dobrovolsky & Gerasimenko (1987) and Ibadinov (1998). The second catalogue includes 60 comets for which an abnormal tail was observed and provides a considerable supplement to Demenko's (1965) catalogue, which included only 16 comets.…”

Section: Introductionmentioning

confidence: 99%

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Some active processes in comet icy nuclei: nucleus splitting and anti tail formation

Ibadinov¹,

Buriev²,

Safarov³

2009

Proc. IAU

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Abstract. The most dramatic display of variable activity of a comet is splitting of the nucleus. For the purpose of revealing the trends of splitting of comet nuclei and of formation of abnormal cometary tails, we have created two catalogues of comets: a catalogue of split nuclei, containing 99 comets, and a catalogue of comets with abnormal tails, including 60 objects. Statistical investigation reveals some general trends of these phenomena. The greatest number of recorded cases of nucleus splitting and abnormal tail (60%) occurs within an interval of heliocentric distance ranging from 0.6 AU to 1.6 AU (maximum at 1.1 AU) and geocentric distance ranging from 0.6 AU to 1.8 AU (maximum at 1.15 AU). Splitting of nuclei and abnormal tails are more often (75%) recorded close to the perihelia of the cometary orbits. Only 16% of splitting comets also exhibit abnormal tails. Some cases of nuclear splitting and large velocity (some km/s) eruptions of dust from a nucleus, as well as cases of abnormal tails developed at large heliocentric distances, may indicate collisions of comet nuclei with other bodies. Our results are of interest for the physics of comets, and for the distribution of meteoroids in solar system.

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Section: Introductionsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Some active processes in comet icy nuclei: nucleus splitting and anti tail formation

Ibadinov¹,

Buriev²,

Safarov³

2009

Proc. IAU

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“…Both theoretical and laboratory simulations agree that the production of a depleted surface layer is essentially an inevitable result in virtually all comets (Ibadinov, 1989;Thiel et al, 1989Thiel et al, , 1991Orosei et al, 1995;de Sanctis et al, 2003;Prialnik et al, 2004;Laufer et al, 2005). Whipple (1978) proposed the basic scenario that as a nucleus approaches the Sun, solar insolation vaporizes the ices, which entrain the surface dust and pull it off the nucleus.…”

Section: Evidence For Mantles and Active Areas On Cometsmentioning

confidence: 99%

Coma morphology of Jupiter-family comets

Farnham

2009

Planetary and Space Science

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We present a general review of cometary coma morphology, with specific reference to how it used in studies of Jupiter family comets. We introduce the most common features that are seen in gas and dust observations, and summarize of how they are used to infer the properties of the nucleus and coma. We also expand the discussion to cover other topics relating to morphology, including the general shape of the coma (characterized by radial gradient profiles) and spatial maps of the color, albedo and polarization of the dust. We address the pros and cons of the different approaches used in the interpretation and analysis of the features. Finally, we review the results obtained for specific comets and compare the Jupiter family comets to those from other classes.

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“…https://doi.org/10.1017/S0252921100109728 Downloaded from https://www.cambridge.org/core. IP address: 34.217.195.47, on 12 May 2018 at 23:27:50, subject to the Cambridge Core terms of heated up ice samples electrically or irradiated them with light sources inside a cold chamber (e.g., Kajmakov and Sharkov, 1972;Ibadinov, 1989). Among the interesting results was the formation and ablation of dust mantles during the sublimation process.…”

Section: Introductionmentioning

confidence: 97%

“…Ibadinov, 1989). Most previous laboratory simulation experiments were done using thin ice samples, ranging between a few microns to a few millimeters, thus excluding those phenomena whose results cannot be extrapolated to much greater sample thickness.…”

Section: Introductionmentioning

confidence: 99%

Laboratory Simulation of Cometary Processes: Results from First Kosi Experiments

Grün

Bar‐Nun

Benkhoff³

et al. 1989

International Astronomical Union Colloquium

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ABSTRACT. In situ observations of comet Halley provided the first photographs of a cometary nucleus and yielded information about its environment, including the emitted gas and dust. The relation between these measurements and properties of and processes on the nucleus is established by theoretical modelling, while laboratory experiments may provide some of the physical parameters needed. In addition, laboratory tests can stimulate new ideas for processes that may be relevant to cometary physics. Processes to be studied in detail by large-scale laboratory experiments may include: (1) heat transport phenomena during sublimation of porous ice-dust mixtures, (2) material modification and chemical fractionation caused by the sublimation processes, (3) buildup and destruction of dust mantles, (4) detailed studies of gas release from mixtures of volatile ices, and (S) the investigation of ice and dust particle release mechanisms. The KOSI-team (Kometensimulation) carried out sublimation experiments with ice-mineral mixtures in a large Space Simulator. During initial experiments, cylindrical samples of 30-cm diameter and IS-cm thickness were irradiated with up to 2700-W/m 2 light energy. The samples consisted of water-ice or water-and C02~ice mineral mixtures. The experiments showed the importance of advection for heat transport into the interior. It was found that the sublimation of CO2 advances into the sample at a higher speed than that of water vapor release. Therefore, emission of volatile gases responded to insolation changes with a time lag of several hours. The ratio of the emitted gas species, as well as the dust-to-gas mass ratio, differs significantly from the values within the sample. A partly permeable refractory mantle of minerals and carbonaceous material developed with time. Dust and ice particle emission has been observed to occur from irradiated dirty ices as well as from dust mantles.

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Laboratory investigation of the sublimation of comet nucleus models

Cited by 16 publications

References 10 publications

Some active processes in comet icy nuclei: nucleus splitting and anti tail formation

Some active processes in comet icy nuclei: nucleus splitting and anti tail formation

Coma morphology of Jupiter-family comets

Laboratory Simulation of Cometary Processes: Results from First Kosi Experiments

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