| Project/Area Number |
17340074
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Particle/Nuclear/Cosmic ray/Astro physics
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| Research Institution | Nagoya University |
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Principal Investigator |
ABE Fumio Nagoya University, Solar-Terrestrial Environment Laboratory, Associate Professor (80184224)
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| Co-Investigator(Kenkyū-buntansha) |
ITO Yoshitaka Nagoya University, Solar-Terrestral Environment Laboratory, Professor (50272521)
MASUDA Kimiaki Nagoya University, Solar-Terrestral Environment Laboratory, Associate Professor (40173744)
MATSUBARA Yutaka Nagoya University, Solar-Terrestral Environment Laboratory, Associate Professor (80202323)
SAKO Takashi Nagoya University, Solar-Terrestral Environment Laboratory, Associate Professor (90324368)
MURAKI Yasushi Konan University, Department of physics, Professor (70013430)
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| Project Period (FY) |
2005 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥16,810,000 (Direct Cost: ¥15,400,000、Indirect Cost: ¥1,410,000)
Fiscal Year 2007: ¥6,110,000 (Direct Cost: ¥4,700,000、Indirect Cost: ¥1,410,000)
Fiscal Year 2006: ¥4,500,000 (Direct Cost: ¥4,500,000)
Fiscal Year 2005: ¥6,200,000 (Direct Cost: ¥6,200,000)
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| Keywords | Astronomy / Astrophysics / Extrasolar Planet / Optical Astronomy / Gravitational Lensing |
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| Research Abstract |
Searches for extra-solar planets with gravitational microlensing need detailed analyses of the light curves of the light curves of the microlensing events. To do so, intensive follow-up observations are necessary as well as the event survey.
This project is aimed to do timely follow-up observations with world-wide telescope networks. The observations have been done with Mt. John 61-cm telescope, Ishigaki 105cm telescope, and collaborations with world-wide telescope networks. From the analyses of the obtained light curves, a giant planet was discovered in OGLE 2005-BLG-071. It was the second planet discovered with microlensing. Then, a 5.5 Earth mass planet was discovered in OGLE 2005-BLG-390. It was the first icy planet discovered outside of our solar system. Furthermore, a planetary system very similar to our Jupiter and Saturn was discovered in OGLE 2006-BLG-109. It was the first planetary system discovered with microlensing and showed effectiveness of this method to find such planetary systems. Discoveries of planets continued. In 2007, four candidates (MOA 2007-BLG-192, 197, 308, and 379) have been discovered and the analyses are in progress.
These results showed new scope of extrasolar planets which is hard to study with conventional radial-velocity method. The results of microlensing may show the planets like our solar system may be very common in the universe. The discovery of low-mass planet in OGLE 2005-BLG-390 showed effectiveness of this method in finding low-mass planets and showed future possibility of finding Earth-mass planet.
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