Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-11-29
Astronomy and Astrophysics
Astrophysics
4 pages, 2 figures. To appear in the proceedings of "IAU conference 249: Exoplanets: Detection, Formation and Dynamics", held
Scientific paper
10.1017/S1743921308016323
Microlensing has proven to be a valuable tool to search for extrasolar planets of Jovian- to Super-Earth-mass planets at orbits of a few AU. Since planetary signals are of very short duration, an intense and continuous monitoring is required. This is achieved by ground-based networks of telescopes (PLANET/RoboNET, microFUN) following up targets, which are identified as microlensing events by single dedicated telescopes (OGLE, MOA). Microlensing has led to four already published detections of extrasolar planets, one of them being OGLE-2005-BLG-390Lb, a planet of only ~5.5 M_earth orbiting its M-dwarf host star at ~2.6 AU. Very recent observations (May--September 2007) provided more planetary candidates, still under study, that will double the number of detections. 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 Galactic abundance of cool planets in the mass regime from Jupiters to Sub-Neptunes.
Cassan Arnaud
Kubas Daniel
Sumi Takahiro
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