Deadly Resonance: How Stars Toss Out Planets ⚡ экспресс
Why don’t tight binary stars (period ≤7 days) have planets? When a pair of stars draws closer due to tidal forces, relativistic precession of their orbit gradually increases. If it matches the precession induced on a planet, a secular resonance occurs—a kind of cosmic pendulum that swings the planet’s orbit. The planet loses angular momentum, its trajectory becomes more and more elongated, and in three out of four cases it perishes: either flung into interstellar space or crashing into the stars. Survivors are pushed to distant orbits where transits are nearly impossible. That’s why we don’t see them.
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.