Hot Jupiters from secular planet–planet interactions

摘要: About one-quarter of the known hot Jupiter exoplanets are orbiting in 'wrong direction', or counter to spin axis host star. Attempts explain this phenomenon have so far failed. It is that triple-star systems, retrograde orbits type can be produced by long-term effects stellar perturbations. An analysis motions planetary bodies, including octupole-order and tidal friction, suggest a similar mechanism may operating involving planets rather than stars. The new model proposes called Kozai capture, which interactions with more-distant planet naturally produce close-in orbits, through forces familiar thought cause high eccentricities observed exosolar planets. 25 per cent ‘hot Jupiters’ (extrasolar Jovian-mass orbits) actually direction star1. Perturbations from distant binary star companion2,3 inclinations, but cannot respect total angular momentum system. Such context secular (that is, long term) perturbations hierarchical systems. Here we report both find Jupiters momentum. With mass perturbers, such an outcome not possible2,3. inner orbit's component parallel need constant4. In fact, as show here, it even change sign, leading orbit. A brief excursion very eccentricity during chaotic evolution orbit allows planet–star rapidly circularize orbit, decoupling forming Jupiter.