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Gliese 3634 b (Commonly shortened to GJ 3634 b) is a Super-Earth in the orbit of the nearby red dwarf Gliese 3634 at approximately 64.5 light-years in constellation Hydra. The planet is approximately eight times the mass of Earth, and orbits its star every two and a half days at a distance of 0.0287 AU. The planet was the first to be discovered by a group of astronomers searching for exoplanets in the orbit of very-low-mass stars after the team reorganized their strategy, choosing to search for targets that they could also confirm using the transit method. However, a transit event associated with Gliese 3634 b was not detected. The planet's discovery was published in ''Astronomy and Astrophysics'' on February 8, 2011. ==Discovery== Gliese 3634 b was one of a sample of over 300 very-low-mass stars targeted by astronomers in search of planets that may orbit such stars. Using the High Accuracy Radial Velocity Planet Searcher (HARPS) at La Silla Observatory in Chile, six years of radial velocity data led the astronomers in the discovery of eleven other planets. After these discoveries, the astronomers chose to refocus their search on short-period planets, hoping to follow up after discoveries using the radial velocity method with a search for planets that also transited, or crossed in front of, their host stars as seen from Earth.〔 The search for Gliese 3634 b started with a single exposure taken with HARPS on March 25, 2009. The results helped verify that Gliese 3634 was an ideal target for a planet search using the radial velocity method (in which the gravitational pull of a planet on its star is measured by observing the resulting Doppler shift), as stellar activity would not overly mask or mimic Doppler spectroscopy measurements. It was also confirmed that Gliese 3634 is neither a binary star nor a quickly rotating star, common false positives when searching for transiting planets. Gliese 3634 was observed two weeks later for ten consecutive nights. Analysis of the resulting data found that the radial velocity variations most likely indicated the existence of a planet.〔 Having discovered the planet, the astronomers worked to discover a transit event using the Infrared Array Camera of the Spitzer Space Telescope, as ground-based observations could prove difficult if Gliese 3634 b was a rocky planet. While the observations did not suggest that Gliese 3634 b transited its star, a few orbital parameters were discovered, yielding the planet's true mass, which cannot be collected solely by radial velocity measurements.〔 The discovery of Gliese 3634 b was reported in the journal ''Astronomy and Astrophysics'' on February 8, 2011. Gliese 3634 b was the first planet discovered by the astronomers after adopting their new strategy, despite their failure to find a transit event for the planet.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Gliese 3634 b」の詳細全文を読む スポンサード リンク
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