Deadly Resonance: How Stars Toss Out Planets ⚡ экспресс
Transiting circumbinary planets are extremely rare and completely absent around binary stars with periods ≤7 days. The secular resonance is studied, where general relativity speeds up the precession of the approaching stars until it matches the Newtonian precession induced on a planet. Adiabatic capture into resonance triggers a transfer of angular momentum from the planet to the binary system, causing the planet’s eccentricity to grow until destabilization, followed by ejection or absorption. The resonance is charted in phase space, and orbit-averaged simulations show: about 80% of planets get captured, around 75% are destroyed, and survivors move to distant orbits with low transit probability. Thus, the formation of tight binaries itself clears the potential habitable zone of transiting planets.
Two stars, drawing together in a cosmic dance, experience an extra wobble — a consequence of spacetime curvature (an effect predicted by Einstein). A planet orbiting them also wobbles. Sometimes the rhythms align: the gravitational tugs from the stars fall in step with the planet’s orbit, like hands pushing a swing. That’s resonance — the orbit stretches, and the planet gets launched from its place.
This is how rogue planets are born: eight out of ten planets around close binary systems fall into this deadly resonance, and three quarters perish. The rest hide far away. That’s why no planets have been found around stellar pairs with orbital periods shorter than seven days — their tight co-habitation mercilessly sweeps everything around away.
🎯 Some binary stars complete a full orbit in just a few hours — their “day” is shorter than a workday. And the distance between them is smaller than from the Sun to Mercury.