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Tidal Decay of Close Planetary Orbits | | F. A. Rasio
; C. A. Tout
; S. H. Lubow
; M. Livio
; | | Date: |
11 May 1996 | | Abstract: | The 4.2-day orbit of the newly discovered planet around 51~Pegasi is formally unstable to tidal dissipation. However, the orbital decay time in this system is longer than the main-sequence lifetime of the central star. Given our best current understanding of tidal interactions, a planet of Jupiter’s mass around a solar-like star could have dynamically survived in an orbit with a period as short as $sim10,$hr. Since radial velocities increase with decreasing period, we would expect to find those planets close to the tidal limit first and, unless this is a very unusual system, we would expect to find many more. We also consider the tidal stability of planets around more evolved stars and we re-examine in particular the question of whether the Earth can dynamically survive the red-giant phase in the evolution of the Sun. | | Source: | arXiv, astro-ph/9605059 | | Services: | Forum | Review | PDF | Favorites | |
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