Microlensing exoplanet search toward the solar system analog

Takahiro Sumi
Osaka University

Although thousands of exoplanets have been found by various methods, not many solar system planets analogs have been detected. Some Jupiter and Saturn analogs and a few Earth-like plants have been found only very recently. Gravitational microlensing has an unique sensitivity to exoplanets outside the snow-line down to the Earth-mass, where the planetary formation is very active. The MOA-II and OGLE-IV carries out microlensing exoplanet search toward the Galactic Bulge in New Zealand and Chile, respectively. These surveys are detecting various kinds of systems, including the Jupiter-Saturn analog, the Neptune analog and the 2-Earth mass planet at 1AU around one of the binary stars. The Wide Field Infrared Survey Telescope (WFIRST) is the NASA's future large space mission, which is scheduled to be launched in 2024. The exoplanet microlensing program is one of the primary science of WFIRST. WFIRST will find about 3000 bound planets and 2000 unbound planets by the high precision continuous survey with 15 min. cadence, which is sensitive to all the solar system analogs except the Mercury. WFIRST can complete the statistical census of planetary systems in the Galaxy, from the outer habitable zone to the outside of the snow-line and gravitationally unbound planets ? a discovery space inaccessible to other exoplanet detection techniques.

Place: 2F Conf. room / 研究管理棟２階会議場（1236号室）