Accueil > Séminaires d’Astrophysique > Microlensing search for extrasolar planets : Discoveries and implications

 

Microlensing search for extrasolar planets : Discoveries and implications

Arnaud Cassan (Université de Heidelberg)

Par Stephane Charpinet - 27/11/2007

 

Séminaires d’Astrophysique

de l’Observatoire Midi-Pyrénées


Séminaire de

Arnaud CASSAN

 (Université de Heidelberg)

Vendredi 30 Novembre 2007 à 11h

OMP, salle Coriolis


Microlensing search for extrasolar planets : Discoveries and implications

Microlensing has proven to be a powerful 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 such as PLANET/RoboNET, once the microlensing nature of an object has been identified by single dedicated telescopes (OGLE and MOA). Microlensing has led to four already published detections, 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. The last microlensing observing campaign (May ?September 2007) provides us five more planetary candidates, still under study, which will soon 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 limit on the Galactic abundance of sub-Jupiter-mass planets, as well as relative abundance of Neptune-like planets.

 

 

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Laboratoire Astrophysique de Toulouse - Tarbes (UMR5572)

CNRS (Midi-Pyrénées)

Univ. Paul Sabatier

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