A possible source and mechanism for the origin of the hot component in the Kuiper belt
| 1Kazantsev, AM 1Astronomical Observatory of Taras Shevchenko National University of Kyiv, Kyiv, Ukraine |
| Kinemat. fiz. nebesnyh tel (Online) 2023, 39(3):53-66 |
| https://doi.org/10.15407/kfnt2023.03.053 |
| Language: Ukrainian |
Abstract: It is proposed a mechanism that is different from the existing ones for the origin of the Kuiper belt (KB) bodies. The distributions of the orbits of the most of bodies of the “hot” component in the KB were analyzed. The shapes of the distributions indicate that all those bodies could have arisen as a result of the destruction of one massive body (the Kuiper belt planet, KBP). The separation velocities of the fragments were determined mainly by the linear velocities of the parts of the KBP at different depths and latitudes. The maximum separation velocity corresponded to the linear velocity on the surface of the KBP near the equator and could be 2.4 km/s. The size of the KBP could be slightly smaller or larger than the size of the Earth. The spin period could be about 4 hours. The spin axis of the KBP was tilted at a little angle to the ecliptic plane and at the moment of the destruction it was directed towards the Sun. This mechanism agrees well with existing observational data. It can explain a noticeable number of bodies in the KB with satellites, as well as the existing dependence of the bulk density of the bodies on the size. According to this mechanism, the spin axes of the fragments (primarily large ones) should be tilted at little angles to the ecliptic plane. The spin axes of the dwarf planets Pluto and Haumea are inclined to the ecliptic plane at angles of 23° and 10° respectively. Obtaining data on the spin pole orientation of other large KB bodies in the future may become the final confirmation of the proposed mechanism. |
| Keywords: dwarf planet, Kuiper belt |
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