Gravitational microlensing is another detection method from "summary" of Exoplanets and Alien Solar Systems by Tahir Yaqoob
Another way to detect exoplanets is through gravitational microlensing. In this method, the gravity of a foreground star acts as a lens, bending and magnifying the light from a background star. If a planet orbits the foreground star, it can further amplify the light from the background star, creating a detectable signal. This technique is particularly useful for detecting planets that are far away from their host stars, as it is not limited by the distance between the planet and the star. Gravitational microlensing can also detect planets that are much smaller than those detected by the radial velocity and transit methods. This is because the signal produced by microlensing is not dependent on the size of the planet, but rather on the mass of the planet and its distance from the star. Therefore, microlensing can detect Earth-sized planets that orbit far from their host stars, which are difficult to detect using other methods. One advantage of gravitational microlensing is that it ...
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