Extrasolar satellite（English: Extrasolar moon)ExoplanetSurrounding according to closuretrackAs a periodically operating satellite, American scientists report that they may have found the first satellite outside the solar system, but this discovery needs more observations to confirm.But in theory there should be many satellites around exoplanets.
In the new research, the above scientific research team found a celestial system called MOA-2011-BLG-262 using telescopes in New Zealand and Australia. The smaller object is likely to be a natural satellite.
Notre Dame UniversityDavid Bennett and others found that although the identity of the intermediate object observed this time is not clear, its mass is 2000 times that of the small planet orbiting it.This means that there are two possibilities: either a dim small star is orbited by a planet 18 times the mass of the Earth;Or a planet with a mass equal to that of Jupiter is orbited by a satellite with a mass less than that of Earth.
However, when observing from the Earth, there is only one chance for distant objects to align with the central object as a lens in the line of sight direction. If they miss it, they cannot observe again. Researchers are not sure which is more likely.NASAJet Propulsion LaboratoryPlanetary scientist Wes Traub said that the model of this study points to the answer of the satellite, and if this is correct, it will be an "amazing discovery".However, Traub could not rule out the possibility of being a planet.
The researchers pointed out that the answer to this mystery depends on the distance between the lensed celestial body and the earth.If the distance is close, the answer is satellite;If the distance is far, the answer is planets.Therefore, after missing this suspected extrasolar "moon", they can only hope to find other extrasolar satellites unexpectedly in the future for comparative analysis.Relevant research papers were published in the new issue of American Astrophysical Journal.
2017-07-29 According to foreign media reports,Columbia UniversityThe researchers announced that they may have discovered the first exomoon, the first satellite orbiting a planet outside the solar system.The researchers said that the signals they found showed a satellite orbiting a distant planet.They used their eyeglasses to observe thisExoplanetThe potential satellite was discovered when.
According to this study, this extrasolar satellite is the size of Neptune and orbits a planet the size of Jupiter.[1]
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The way astronomers look for new planets outside the solar system is to observe whether there is wobble in the target star.Because the gravitational action of planets on stars will cause the wobble of stars, the wobble of stars often indicates the existence of planets.The same is true for finding satellites.butUniversity College LondonHowever, David Kipping, an astronomer of, believes that this method is difficult to determine whether there are satellites around the planet, because these wobbles may also be caused by other factors, such as the gravitational effect of other planets.Ji Pingze has developed a searchExtrasolar planetsThis is a new method of observing the speed of the planet every time it moves in front of the star. Because the satellite will cause speed changes, we can judge whether there is a satellite around the planet according to the swing of the planet and the measured speed.
Of the 300 known extrasolar planets, about 30 are in areas where life may exist, but these planets are all giant gas planets several times larger than Jupiter, so there is little possibility of life on them.However, the satellites around it are also in the area where life may exist, and some of them may be composed of rocks and other materials similar to the earth, so there is a greater possibility of breeding life.
