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Kepler-40, formerly known as KOI-428, is an F-type star in the constellation Cygnus. Kepler-40 is known to host at least one planet, Kepler-40b. The star is approximately 1.5 times more massive than the Sun, and is over two times its size; it was, at upon its discovery, the largest yet discovered with a transiting planet in its orbit.〔 Kepler-40 was first noted as home to a possible transiting object by the Kepler spacecraft; the data on the system was released to the public. A team of French and Swiss scientists used follow-up data to determine the existence of the Hot Jupiter planet Kepler-40b, and later had their results published in a scientific journal on January 4, 2011. ==Observational history== Kepler-40 was first targeted by the Kepler spacecraft, an Earth-trailing NASA operation that searches for planets that transit, or cross in front of, their host stars. It was labeled a Kepler Object of Interest (KOI) during the satellite's first 33.5 days of operations, which stretched from mid-May to mid-June 2009, because of the detection of a potential transit event. The data collected by Kepler's photometer was publicly released, including data on Kepler-40 and its possible transiting companion.〔 Data on Kepler-40 was analyzed by a team of French and Swiss astronomers, who first tested for false positives. When all obvious false positives were cleared, the science team used the SOPHIE échelle spectrograph at the Haute-Provence Observatory in southern France to gather radial velocity measurements on the star. Collected data was then checked to see if it corresponded with that of a closely orbiting binary star or that of a planet; it was found to be that of a planet, leading to the confirmation of Kepler-40b.〔 After Kepler-40b was confirmed, the French and Swiss science team worked to clarify the stellar parameters its star by analyzing the star's spectrum as collected by SOPHIE. Kepler-40 is the sixth known planetary host star with a radius of more than 1.8 times that of the Sun.〔 At the time of its discovery, Kepler-40 was the most evolved star known to have a transiting planet.〔 Kepler-40 and its exoplanet were published in the journal ''Astronomy and Astrophysics'' on January 4, 2011, after being submitted on September 15, 2010.〔 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「Kepler-40」の詳細全文を読む スポンサード リンク
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