Tuesday, April 3 2018

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The microlensing light curves provide us the mass ratios of planet-host stars, but fail to provide the mass measurements of the planet and the host star in physical units. If we are lucky, we can observe parallax signals in the light curves and this can provide us with the mass measurement. But in most cases, a few years after the event, we can observe the lens and source resolving out in the follow-up high resolution images. The unique detection of lens, along with other mass-distance relations, yields mass measurements of the exoplanet and its host.