Other
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusm.p32a..07s&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #P32A-07
Other
6035 Orbital And Rotational Dynamics, 6210 Comets (6023), 6213 Dust
Scientific paper
In our opinion [1-2], some trans-Neptunian objects (TNOs) and planetesimals in the feeding zone of the giant planets with diameters up to 1000 km could be formed directly by the compression of large rarefied dust condensations, but not by the accretion of smaller solid planetesimals. Migration processes of small bodies from the outer regions of the solar system, including the Edgeworth-Kuiper belt, could be responsible for the delivery of the original matter (mainly volatiles) to the terrestrial planets and thus to give rise to the life origin. As migration of TNOs to Jupiter's orbit was studied by several authors, we integrated the orbital evolution of 30,000 Jupiter-crossing objects under the gravitational influence of planets [3]. A few considered objects got Earth-crossing orbits with aphelion distances Q<4.2 AU and moved in such orbits for more than 1 Myr (up to tens or even hundreds of Myrs). Collisions of cometary objects with the terrestrial planets from the Encke- type orbits with aphelia located inside the orbit of Jupiter are assumed to play a greater role than direct impacts from the Jupiter-crossing orbits. It may be possible that the fraction of 1-km former TNOs among near- Earth objects (NEOs) can exceed several tens of percents or most of former TNOs that had got NEO orbits disintegrated into mini-comets and dust during a smaller part of their dynamical lifetimes if these lifetimes are not small. Our estimates show that the amount of icy planetesimals impacted on the Earth during formation of the giant planets is of the order of mass of water in the Earth oceans if the total mass of these planetesimals was about 100 Earth masses. Mars acquired more water per unit of mass of a planet than Earth. During the following 4 Gyr the effectiveness of transport was much less. We integrated [4-5] the orbital evolution of 12,000 dust particles. Probabilites of collisions of particles started from Jupiter-family comets were maximum at diameter d about 100 microns and can be smaller by several orders of magnitude for other d. These maximum probabilities can be 1-2 orders of magnitude greater than the probabilities for comets which produced these particles. The dust particles could be most efficient in the delivery of organic or even biogenic matter to the Earth, because they experience substantially weaker heating when passing through the atmosphere [6]. References: [1] Ipatov S.I. (2001) LPSC, #1165. [2] Ipatov S.I. (2004) "The Search for Other Worlds", ed. by S.S. Holt and D. Deming, AIP Conference Proceedings, 713, 277-280. [3] Ipatov S.I. and Mather J.C. (2004) Annals of the New York Acad. of Sciences, 1017, 46-65. [4] Ipatov S.I., Mather J.C., and Taylor P. (2004) Annals of the New York Acad. of Sciences, 1017, 66-80. [5] Ipatov S.I. and Mather J.C. (2006) Advances in Space Research, in press. [6] Marov M.Ya. and Ipatov S.I. (2005) Solar System Research, 39, 374-380.
Mather John C.
Sergei I. I.
Ya Marov Mikhail
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