Features of a comet nucleus: The case of 103P/Hartley 2

Gronkowski, P.; Sacharczuk, Z.; Topolewicz, Stanisław

doi:10.1002/asna.201111585

Cited by 4 publications

(3 citation statements)

References 39 publications

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“…The nucleus of this comet was surrounded by a large number of clouds consisting of of water ice which were ejected from the nucleus by geyser-like jets of CO 2 (A'Hearn 2011; Farnham et al 2011;Feaga 2011;Hermalyn et al 2011;Schultz 2011;Sunshine et al 2011). Thus the phenomenon of cometary geysers was analysed in a number of papers during the last decade (Yelle, Sonderblom & Jokipii 2004;Belton 2010;Gronkowski, Sacharczuk & Topolewicz 2011).…”

Section: The Sublimation Of Co In the Undersurface Cavitiesmentioning

confidence: 99%

“…Applying the method presented in the paper by Gronkowski, Sacharczuk & Topolewicz (2011), we can obtain the size of large pieces of cometary material ejected by geysers from the 29P/SW1 nucleus (see Table 2). According to this table, the maximum size of cometary chunks which can be lifted by jets of geysers is in the range of ten centimetres.…”

Section: The Sublimation Of Co In the Undersurface Cavitiesmentioning

confidence: 99%

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The outbursts of the comet 29P/Schwassmann‐Wachmann 1: A new approach to the old problem

Gronkowski

2014

Astron Nachr

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As far as outbursts activity is concerned, the 29P/Schwassmann-Wachmann 1 is the exceptional comet. This Centaur object shows quasi-regular flares with periodicities of 50 days (Trigo-Rodriguez et al. 2010). In the introductory part of the presented paper the most well-known hypotheses which try to explain this cometary behaviour are reviewed. The second, actual part of this paper presents the new model for the outburst activity of this comet. The model is based on the idea of Ipatov (2012), according to which there are large cavities below a considerable fraction of the comet's surface containing material under high gas pressure. In favourite conditions the surface layers over the cavities are thrown away and the interior of these cavities is exposed. Consequently, an outburst of the comet's brightness may be observed. The main characteristics of an outburst of this comet, the brightness jump, is calculated. Numerical simulations were carried out for wide range of possible cometary parameters. The obtained results are in good agreement with the observations.

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Section: The Sublimation Of Co In the Undersurface Cavitiesmentioning

confidence: 99%

Section: The Sublimation Of Co In the Undersurface Cavitiesmentioning

confidence: 99%

The outbursts of the comet 29P/Schwassmann‐Wachmann 1: A new approach to the old problem

Gronkowski

2014

Astron Nachr

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“…Marboeuf et al (2010) discuss susceptibility of formation of the so-called multiple guest clathrate due to presence of several volatile compounds in the gas phase of the porous network of the cometary nuclei. Gronkowski et al (2011) discuss the carbon dioxide geysers from the nucleus of comet 103P/Hartley 2.…”

Section: Ices At Low Temperature and Clathratesmentioning

confidence: 99%

Experimental studies of sublimation of highly volatile ices in relevance to the ices of the solar system

2013

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A b s t r a c tStudies of sublimation of complex ices prepared by deposition of gaseous CO, CH 4 , N 2 , and NH 3 molecules on a cold plate have been performed. The low pressure and low temperature system was used: 10 -9 -10 -5 mbar and the lowermost temperature 10 K. Diagnostic of composition of evaporates (at an actual temperature) was done by means of the mass spectrometer. The latter allowed following simultaneously the partial pressure of five different ions or radicals escaping from the substrate. It has been found that highly volatile molecules that were used simultaneously with the low volatile ones to form the complex ices (mixtures or clathrates) present a different sublimation pattern than the sublimation of pure high-volatile ices. In particular, the high-volatile component sublimes at two or even three different temperature regimes: At low temperature that is typical for sublimation of this component, as well as at much higher temperatures. This effect seems to be important when degassing and outbursts from cometary nuclei are considered. It can be also important for modeling of cryovolcanic processes on the icy satellites.

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The influence of the nucleus shape on the maximum size of grains ejected from a comet by gentle sublimation and jet‐like features

Gronkowski

Wesołowski

2015

Astron Nachr

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This paper deals with obtaining the maximum size of cometary grains ejected from nuclei of different shapes. Two mechanisms in terms of grain ejection from comets are taken into consideration. The first one is dragging of particles by outflowing gas molecules released by gentle sublimation from the comets. The second one is related with gas jets from the cavities in a nucleus by cometary jet‐like phenomena. We focused on ellipsoidal shapes of cometary nuclei but with different flattening. Calculations have been carried out for a large range of cometary parameters. It has been shown that for fixed mass of the nucleus the maximum size of grains is an increasing function of the nucleus flattening. (© 2015 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Features of a comet nucleus: The case of 103P/Hartley 2

Cited by 4 publications

References 39 publications

The outbursts of the comet 29P/Schwassmann‐Wachmann 1: A new approach to the old problem

The outbursts of the comet 29P/Schwassmann‐Wachmann 1: A new approach to the old problem

Experimental studies of sublimation of highly volatile ices in relevance to the ices of the solar system

The influence of the nucleus shape on the maximum size of grains ejected from a comet by gentle sublimation and jet‐like features

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