12/3/2023 0 Comments Tidal heatingRapidly the system tends to that state is determined by the strength of the tidal Orbital motion, and their spin axis are perpendicular to the orbital plane. Which the orbit is circular, the rotation of both stars is synchronized with the To viscous and radiative dissipation to the state of minimum kinetic energy, in Of such a disc, which is the case that we shall consider here, they evolve due The rotation of the components their orbital motion and the disc. Tidal interaction, kinetic energy and angular momentum are exchanged between Momentum that is carried away by winds and by gravitational waves. Whether they possess or not a circumstellar disc, if one can ignore the angular This is true in particular for binary stars, star-planet(s) systems, Zahn:Ī fundamental property of closed mechanical systems is that they conserve their There's different ways of answering "why," and here is a great conceptual answer given by the God Father of astrophysical tides himself, Z. In general, tidal forces in binary systems (like the Earth-Moon system, or a binary star, etc.) effect the binary in three main ways: in order of longest timescale to shortest timescaleġ) circularization of the orbit (eccentricity goes to zero, binary separation goes to minimum).Ģ) alignment of the binary components' spin angular momenta with the orbital angular momentum (the directions of $S$ and $L$ are the same).ģ) synchronization of the binary components' rotational frequency with the orbital frequency. I will assume you mean the eccentricity in the orbit of the Moon around the Earth.
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