description MOA-2007-BLG-192Lb Overview
MOA-2007-BLG-192Lb is a low-mass exoplanet detected through gravitational microlensing, in which the gravity of a foreground planetary system magnified the light of a more distant background star. The planet has an estimated mass of roughly three Earth masses and orbits a very low-mass host at a distance near the Earth-Sun distance. Microlensing makes such cold, distant planets detectable even when they do not transit or produce a readily measured radial-velocity signal.
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How was MOA-2007-BLG-192Lb detected?
It was detected through gravitational microlensing, where a foreground planetary system magnifies light from a more distant background star. The method can reveal low-mass planets even when they do not transit their host star.
What is the estimated mass of MOA-2007-BLG-192Lb?
Its estimated mass is roughly three Earth masses. That makes it a low-mass planet compared with gas giants such as Jupiter.
Why is microlensing useful for finding planets?
Microlensing is sensitive to planets at larger star-planet separations and can detect systems far beyond the easiest targets for transit surveys. The event is temporary, so the same planet is usually difficult to observe again by ordinary repeated transits.
Does MOA-2007-BLG-192Lb orbit a star like Earth does?
It is associated with a distant planetary system, but microlensing observations provide less familiar orbital information than a long-term transit or radial-velocity campaign. The discovery is mainly important because it demonstrated sensitivity to a planet of only a few Earth masses.
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