2024-03-28T09:18:05Z
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oai:nagoya.repo.nii.ac.jp:00024726
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Heating of Porous Icy Dust Aggregates
Sirono, Sin-iti
open access
© 2017. The American Astronomical Society
At the beginning of planetary formation, highly porous dust aggregates are formed through coagulation of dust grains. Outside the snowline, the main component of an aggregate is H2O ice. Because H2O ice is formed in amorphous form, its thermal conductivity is extremely small. Therefore, the thermal conductivity of an icy dust aggregate is low. There is a possibility of heating inside an aggregate owing to the decay of radionuclides. It is shown that the temperature increases substantially inside an aggregate, leading to crystallization of amorphous ice. During the crystallization, the temperature further increases sufficiently to continue sintering. The mechanical properties of icy dust aggregates change, and the collisional evolution of dust aggregates is affected by the sintering.
IOP publishing
2017-06-10
eng
journal article
VoR
http://hdl.handle.net/2237/26941
https://nagoya.repo.nii.ac.jp/records/24726
https://doi.org/10.3847/1538-4357/aa7389
0004-637X
Astrophysical Journal
842
1
11
11
https://nagoya.repo.nii.ac.jp/record/24726/files/Sirono_2017_ApJ_842_11.pdf
application/pdf
715.8 kB
2018-02-22