Thermal stresses in cometary nuclei |
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| Affiliation: | 1. Department of Clinical Pharmacy, Graduate School of Pharmaceutical Sciences, Nagoya City University, Nagoya, Japan;2. Department of Reproductive Biology, National Research Institute for Child Health and Development, Tokyo, Japan;3. Department of Hematology and Oncology Research, National Research Institute for Child Health and Development, Tokyo, Japan;4. Department of Environmental and Health Science, Tohoku Pharmaceutical University Sendai Japan |
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| Abstract: | Assuming cometary nuclei composed of weakly attached cometesimals, thermal stresses due to the temperature differences between the surface and the core are calculated. Both homogeneous icy bodies and cometesimals with material inhomogeneities are considered. It is shown that spherical inclusions in water ice cause strong stresses. Even if viscoelastic effects are taken into account the stresses in the superficial regions exceed the strength of water ice and therefore cause cracks to form. The consequences of this for such irregular cometary activity as splitting and outbursts are discussed. |
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