TY - JOUR
T1 - Interpretation on deep impact results
T2 - Radial distribution of ejecta and the size distribution of large-sized grains
AU - Kadono, T.
AU - Sugita, S.
AU - Ootsubo, T.
AU - Sako, S.
AU - Miyata, T.
AU - Furusho, R.
AU - Honda, M.
AU - Kawakita, H.
AU - Watanabe, J.
N1 - Funding Information:
Observatory of Japan (S05A-042 and S05A-OT11). The authors are grateful to two anonymous reviewers for useful comments. This research is partially supported by Grant in Aid from the Japan Society for the Promotion of Science.
PY - 2010
Y1 - 2010
N2 - Several observations of dust grains ejected from the comet 9P/Tempel 1 by the Deep Impact event strongly suggest that the evaporation and expansion of volatiles occurred and that the vapor accelerated some dust grains. When grains are accelerated by gas, size sorting should occur, that is, larger grains tend to stay closer to the nucleus, while smaller grains is pushed farther away. This means that the light at each distance is emitted from identical-sized grains. Hence, we can estimate the size distribution of grains based on the flux as a function of the distance from the nucleus. A simple evaluation indicates that the size distribution of grains with a size larger than ∼10 μm is expressed as a power law and the index is ∼-4. This is expected to be an alternative method to estimate the size distribution of grains, though detailed analyses and numerical simulations should be necessary to evaluate the error of this method.
AB - Several observations of dust grains ejected from the comet 9P/Tempel 1 by the Deep Impact event strongly suggest that the evaporation and expansion of volatiles occurred and that the vapor accelerated some dust grains. When grains are accelerated by gas, size sorting should occur, that is, larger grains tend to stay closer to the nucleus, while smaller grains is pushed farther away. This means that the light at each distance is emitted from identical-sized grains. Hence, we can estimate the size distribution of grains based on the flux as a function of the distance from the nucleus. A simple evaluation indicates that the size distribution of grains with a size larger than ∼10 μm is expressed as a power law and the index is ∼-4. This is expected to be an alternative method to estimate the size distribution of grains, though detailed analyses and numerical simulations should be necessary to evaluate the error of this method.
KW - Deep Impact
KW - Ejecta
KW - Jupiter family comets
KW - MIR observation
KW - SUBARU telescope
KW - Size distribution
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U2 - 10.5047/eps.2008.12.005
DO - 10.5047/eps.2008.12.005
M3 - Article
AN - SCOPUS:77949790663
VL - 62
SP - 13
EP - 16
JO - Earth, Planets and Space
JF - Earth, Planets and Space
SN - 1343-8832
IS - 1
ER -