News & Topics
We updated "Members." (Apr 5, 2019)
Mr. Ido, Mr. Goda, Mr. Miyazaki, Ms. Kondo and Ms. Suematsu made presentations at 2019 Spring annual meeting of The Astronomical Society of Japan. (Mar 14-17, 2019)
A paper by Mr. Goda "A New Method for Calibration of Gain Variation in a Detector System" was published in The Astronomical Journal. (Nov 30, 2018)
Prof. Shibai and Mr. Miyazaki made presentations at 2018 Autumn annual meeting of The Astronomical Society of Japan. (Sep 19-21, 2018)
Prof. Shibai and Mr. Koshimoto made presentations at 2017 Autumn annual meeting of The Astronomical Society of Japan. (Sep 11-13, 2017)
A paper by Mr. Itoh "Pupil Masks for Spectrophotometry of Transiting Exoplanets" was published in The Astronomical Journal. (Aug 17, 2017)
A paper by Mr. Nagakane "MOA-2012-BLG-505Lb: A Super-Earth-mass Planet That Probably Resides in the Galactic Bulge" was published in The Astronomical Journal. (Jun 30, 2017)
A paper by Mr. Koshimoto "MOA-2016-BLG-227Lb: A Massive Planet Characterized by Combining Light-curve Analysis and Keck AO Imaging" was published in The Astronomical Journal. (Jun 9, 2017)
A paper by Mr. Hirao "OGLE-2013-BLG-1761Lb: A Massive Planet around an M/K Dwarf" was published in The Astronomical Journal. (Jun 8, 2017)
We updated "Members." (Apr 5, 2017)
Associate Prof. Sumi won "The Hayashi Chushiro Prize 2016" !! (Mar 17, 2017)
Associate Prof. Sumi was nominated to "The Hayashi Chushiro Prize 2016" !! (Feb 14, 2017)
current progress in optical adjustment system for FITE was posted." (Feb 7, 2017)
current progress in an FIR array detector was posted." (Feb 6, 2017)
"We moved to a new FITE lab." (Dec 15, 2016)
A paper by Mr. Koshimoto "OGLE-2012-BLG-0950Lb: The First Planet Mass Measurement from Only Microlens Parallax and Lens Flux" was published in the Astrophysical Journal. (Dec 14, 2016)
"Prof. Shibai made a presentation at a symposium of ISAS." (Nov 2, 2016)
"An article on FITE was published in a journal "sternzeit." (Oct 21, 2016)
" The new centroid control system for FITE (Far-Infrared Interferometric Telescope Experiment) was posted. " (Oct 13, 2016)
"Prof. Shibai, Mr. Itoh and Mr. Oyama made presentations at 2016 Autumn annual meeting of The Astronomical Society of Japan." (Sep 14-16, 2016)
A paper by Assistant Professor Matsuo on development of a new method for spectroscopy of extrasolar planets with space-based telescope was published in the Astrophysical Journal."
A paper by Mr. Hirao on discovery of a new saturn-mass planet orbiting around a M-type star with microlens method was published in the Astrophysical Journal."
"Discovery of a Terrestrial Planet in a Binary-star System Located in 3000 Light Years Away from Us " (July 4, 2014)
"ALMA Discovers a Formation Site of a Giant Planetary System " (Jan 17, 2014)
" Subaru Telescope's Imaging Discovery of a Second Jupiter Shows the Power and Significance of the SEEDS Project" (August 4, 2013)
" Direct Infrared Image of an Arm in Disk Demonstrates Transition to Planet Formation" (Feb 7, 2013)
" Direct Imaging of a Super-Jupiter Around a Massive Star" (Nov 19, 2012)
" Discovery of a Giant Gap in the Disk of a Sun-like Star May Indicate Multiple Planets" (Nov 8, 2012)
"Discovery of an Exoplanet Candidate Orbiting a Sun-Like Star: Inaugural Observations with Subaru's New Instrument HiCIAO" (December 3, 2009)
"Astronomers successfully obtained images of an extra-solar planet" (May 21, 2009)
"Water ice in the young planetary system - future ocean of the planets?" (Feb 17, 2009)
We conduct observational research to investigate formation process of extrasolar planets as well as galaxy formation and starburst phenomena. In these astronomical phenomena, small solid particles (interstellar dust grains) play important roles in energy conversion and various chemical reactions in space. As the dust grains reradiate absorbed energy mainly in the infrared domain, precise infrared observations provide us valuable information to elucidate important physical processes in space. The longer wavelength part of infrared (far-infrared) cannot be observed from the ground because the earth's atmosphere is completely opaque. Therefore, we mount the far-infrared telescopes on artificial satellites or scientific balloons, and execute precise observations in space. In particular, we are developing a far-infrared astronomical interferometer for the first time in the world so as to achieve a spatial resolution more than ten times higher than previously obtained. We also perform near-infrared high-contrast observations of protoplanetary disks and young, gaseous giant extrasolar planets using the Subaru telescope in Hawaii.
- Infrared observations of extrasolar planets and protoplanetary/debris disks
- Study on interstellar dust grains in galaxy formation/starburst phenomena
- Development of far-infrared interferometer for astronomy
FITE (Far-Infrared Interferometric Telescope Experiment) is a balloon-borne instrument equipped with a Michelson interferometer, and will achieve the tremendous spatial resolution in far-infrared, about 1 arcsec at 100 micron. It will open a new frontier to study dusty universe in far infrared. The first light is scheduled in the fall of 2010.
MOA (Microlensing Observations in Astrophysics)
The MOA project is a collaboration between Japan and New Zealand which searches for extrasolar planets via gravitational microlensing.
Gravitational microlensing occurs when the light from a background star (the source star) is deflected by the gravitational potential of a foreground star (the lens star). This causes the light from the source star to appear brighter, leading to a time dependent magnification of the source star.
If the lens star hosts a planet, and if the planet also passes close to the light given off by the source star, the planet will also act as a lens, resulting in a characteristic, short-lived signal in the primary magnification.
Through a detailed analysis of the light curve of a planetary microlensing event, we can derive certain important physical characteristics of the planet, such as its mass or its separation from its host star.
Also this method is sensitive to free floating planets.
Our observations focus on microlensing events in the Galactic bulge and are conducted using the 1.8m MOA-II telescope at Mt.John observatory in New Zealand.
For more information, click here.
SEEDSiStrategic Exploration of Exoplanets and Disks with HiCIAO/AO188j
We join the SEEDS project to study extrasolar planets and protoplanetary/debris disks. The imaging observations will be carried out with the near-infrared camera HiCIAO on the Subaru Telescope. The state-of-art instrument will provide us the images of extrasolar planets with its high-contrast and high spatial resolution. The science observations have started from October 2009.
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