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- W2002850290 abstract "view Abstract Citations References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Origins of Interplanetary Dust. Harwit, Martin Abstract We establish that most of the dust observed in comet tails is soon lost to interstellar space, because the sun's radiation pressure pushes grains out of the solar system. This argument differs from the usual hypothesis that only those grains can be ejected whose gravitational attraction to the sun is less than their radiative repulsion. Instead, one finds that grains are forced out of the solar system whenever the change in solar (gravitational plus radiative) potential is large enough for the grain's total energy to become positive. One can show that debris from short-period comets and from asteroids tends to be more easily retained in interplanetary space and can contribute to the zodiacal cloud. However, since short-period comets are weak emitters, it is not at all clear that their rate of dust supply can equal the Poynting-Robertson loss. Collision of asteroids should provide sufficient debris, but it is shown that this debris is only liberated sporadically in the catastrophic collisions of the largest asteroids. It is not clear whether a sufficient amount of dust can be liberated in this manner or whether, if liberated, this dust would not all descend into the sun during a brief interval of a few thousand years. Publication: The Astronomical Journal Pub Date: 1963 DOI: 10.1086/109129 Bibcode: 1963AJ.....68S..75H full text sources ADS |" @default.
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- W2002850290 date "1963-01-01" @default.
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- W2002850290 title "Origins of Interplanetary Dust." @default.
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