Evolution of the Oort cloud angular momentum: Numerical simulation |
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| Authors: | Alexander Lopatnikov Leonid Marochnik Lev Mukhin Roald Sagdeev Daniel Usikov Georgy Zaslavsky |
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| Institution: | (1) Space Research Institute, Academy of Science of the USSR, Moscow, USSR |
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| Abstract: | This paper considers the evolution of a flat svarm of cometary bodies (under the effect of the passage of stars), initially moving in one direction along the circular orbits with radii 1.4×104<r<2×104 AU and along elliptic orbits with semi-major axes 5×103<a<1×104 AU and with perihelia within 50<q<100 AU. Numerical simulation shows that the original flat belt of comets is thermalizing. Its root-mean-squarez-coordinate grows withr. A cometary cloud forms with a dense flattened inner core and a rarefied halo (the Oort cloud proper). The value  =N
core/N
halo varies within a wide range (up to the order of magnitude) depending on the model used (N
core andN
halo are the numbers of comets in the core and the halo, respectively).The hypothesis of a massive Oort cloud (Marochniket al., 1988) implies that the Oort cloud should have a large angular momentum. This paper employs numerical simulation to calculate Oort cloud models to which the initially flat located at the periphery of the solar nebula rotating cometary swarms is evolving in time. The loss of the initial angular momentum over the time of the Oort cloud evolution is not large. |
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