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Home » Issues » Archive of Issues » 2022 - 2 issue » pp. 319-337

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Russia Moscow
Year
2022
Volume
32
Issue
2
Pages
319-337
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Section Mechanics
Title On the exo-planet precession under torqes due to three celestial bodies with the evolution of the satellite's orbit
Author(-s) Krasil’nikov P.S.a
Affiliations Moscow Aviation Institutea
Abstract We investigate the non-resonant evolution of the axial tilt of hypothetical exo-Earth in the gravitational field of a star, planet's satellite (exo-Moon) and outer planet (exo-Jupiter). The exo-Earth is assumed to be rigid, axially symmetric ($A=B$) and almost spherical. We assume the orbits of the both exo-planets to be Keplerian ellipses with focus in the star, the orbit of exo-Moon to be an evolving Keplerian ellipse with slowly changing of ascending node longitude and periapsis argument. Assuming the frequencies of the unperturbed orbital elliptical motion to be of the order of unity, we obtain the canonical averaged equations describing the perturbed oscillations of the exo-Moon spin axis. These equations contain parameters changing slowly over time. Using the smallness of the planets' masses relative to the mass of the star, we have obtained simplified equations of oscillations of the exo-Earth spin axis by the small parameter method. Time integration of simplified equations gives the axial tilt of exo-Moon as a function of time. It is shown that the torques from the exo-Jupiter create a secular, long-period oscillation mode in axial tilt with a frequency equals to frequency of unperturbed spin axis precession of the exo-Earth. The impact of the exo-Moon on the evolution of the exo-Earth spin axis is that short-period harmonics appear in the oscillations of the axial tilt. The frequency of such oscillations is close to the precession frequency of the ascending node longitude of the exo-Moon orbit. We have calculated the evolution of exo-Earth axial tilt for two exo-planetary systems, i.e., for a system similar to the solar system, and for a planetary exo-system 7 Canis Majoris. The effect of destabilization (stabilization) of the exo-Earth tilt oscillations due to the torques exerted by exo-Moon and exo-Jupiter is described.
Keywords axial tilt of exo-planet, planetary exo-system, averaged equations, effect of destabilization
UDC 521.92, 517.928.7
MSC 70F15, 70K65
DOI 10.35634/vm220210
Received 18 May 2022
Language Russian
Citation Krasil’nikov P.S. On the exo-planet precession under torqes due to three celestial bodies with the evolution of the satellite's orbit, Vestnik Udmurtskogo Universiteta. Matematika. Mekhanika. Komp'yuternye Nauki, 2022, vol. 32, issue 2, pp. 319-337.
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