Three-dimensional simulations of internal wave breaking and the fate of planets around solar-type stars
作者： A. J. Barker
DOI: 10.1111/J.1365-2966.2011.18468.X
关键词:
摘要: We study the fate of internal gravity waves approaching centre a non-rotating solar-type star, by performing 3D numerical simulations using Boussinesq-type model. These are excited at top radiation zone tidal forcing short-period planet on circular, coplanar orbit. This extends previous work done in 2D Barker & Ogilvie. first derive linear wave solution, which is not exact 3D; however, reflection ingoing from close to perfect for moderate amplitude waves. Waves with sufficient cause isentropic overturning break, and deposit their angular momentum near centre. forms critical layer, velocity flow matches orbital frequency planet. efficiently absorbs waves, spins up star inside out, while spirals into star. also perform integrations determine linearised adiabatic response throughout stellar models masses range 0.5 < m_star/M_sun 1.1, main sequence lifetimes. The aim launching region these more detail, accuracy semi-analytic approximation torque that was derived under assumption all absorbed layer. conclusions this nonlinear mechanism dissipation could provide an explanation survival extrasolar planets observed around FGK stars, it predicts destruction massive planets. provides further support model outlined paper Ogilvie, makes predictions will be tested ongoing observational studies, such as WASP Kepler.
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