Searching for extrasolar planets via the microlensing technique: Discoveries and implications for planet

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Scientific paper

Microlensing has recently proven to be a valuable tool to search for extrasolar planets of Neptune- to super-Earth-mass planets at orbits of few AU. Since planetary signals are of very short duration, an intense and continuous monitoring is required, which is achieved by ground-based network of telescopes, once the microlensing nature of an object has been identified by single dedicated telescopes. Up to now (July 2007) the detections of extrasolar planets amount to four, one of them being OGLE 2005-BLG-390Lb, a planet of only ˜5.5 MoplusB orbiting its M-dwarf host star at ˜2.6 AU. For non-planetary microlensing events observed from 1995 to 2006, we compute detection efficiency diagrams which can then be used to derive an estimate of the limit on the Galactic abundance of sub-Jupiter-mass planets, as well as relative abundance of Neptune-like planets.

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