Although the planets in the solar system change differently, they all follow at least one principle: all planets move in the same direction as the sun.However, this is not a universal truth.In recent years, astronomers have found somePlanetary systemIt contains Jupiter like giant planets that can orbit in the opposite direction of rotation to the main star.Now, a computer simulation experiment carried out by a research team has revealed how these planets enter into funny retrograde orbits.In the simulation experiment, onegas giant Initially, it runs in the same direction as the rotation of the star.However, the gravitational action of another planet or a brown dwarf farther away from the main star suddenly pulled the planet out of its original orbit and entered a new orbit inclined to a certain angle with the equatorial plane of the star.As the track became more and more inclined, I finally turned a somersault one day.This is the birth process of a retrograde orbit under gravitational perturbation.
becauseplanetIs rotating in afixed starThe extended rotating gas and dust disk are formed inside, so their orbits should follow the rotation direction of the star.That's why astronomers first found agas giant ——The so-called "hot Jupiter" - going retrograde along a linetrackThe reason for confusion after rotating near the parent star.
An early explanation is that several giant planets are simultaneouslyProtoplanetFormed in a diskGravitational interactionSomehow deflected the planets from their respective orbits.This eventually leads to one or more planets running in a close orbit opposite to the rotation direction of the star.
Scholars' explanation
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In this new study, Smdar Naoz of Northwestern University in Evanston, Illinois, and his colleagues tested a different hypothesis.
Naoz pointed out: "This kind of influence is weak for the internal planets, but it gradually increases over a long period of time."
The latest issue published by her research team on May 12, 2011《natural》This research result was reported in the journal.
Naoz said that the simulation shows that such orbital reversal may explain why nearly half of the hot Jupiters discovered so far are in retrograde orbits.
Joshua Winn, an astrophysicist at the Massachusetts Institute of Technology in Cambridge, believes that one way to prove this mechanism is to find planets or stars that may cause the orbit to flip.He said: "Several research teams are currently carrying out more detailed search work, aiming to find additional stars or planets in the close running giant planet system... We should find the 'evil hand' that flips these retrograde Jupiter orbits."[1]
