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Kepler-39b
KOI-423b is a Jupiter-like planet discovered in the orbit of F-type star KOI-423. KOI-423b is eighteen times more massive than Jupiter, and is about a five fourths its size. The planet orbits its host star at about 15% of the average distance between the Earth and Sun. KOI-423b's host star was investigated by European astronomers along with three other stars, including the host star of KOI-428b, using equipment at the Haute-Provence Observatory in France. Collection and analysis of data in late 2010 led to the confirmation of KOI-423b. The discovery paper was published in a journal on June 6, 2011.
==Discovery==
The Kepler spacecraft is a NASA telescope equipped with photometric equipment.. Launched in 2009, Kepler continuously watches 156,000 stars in a small area. A team of astronomers, hoping to learn more about Hot Jupiter planets and brown dwarfs, selected four F-type stars from the Kepler Input Catalog flagged as host to a Kepler Object of Interest (a transiting object that could possibly be a planet). Using three quarters of Kepler's data, the science team conducted a follow-up investigation in using the SOPHIE échelle spectrograph at the Haute-Provence Observatory in southern France, observing stars KOI-428, KOI-423, KOI-552 and KOI-410. Of these, conclusive evidence of a planet orbiting KOI-410 could not be found, and KOI-552 was found to be a binary star with an M-type companion. The Hot Jupiter KOI-428b was the first of these four to be confirmed.〔
SOPHIE collected thirteen radial velocity measurements of KOI-423 between July 26, 2010 and September 10, 2010. Seven of the measurements were affected by moonlight, but were corrected. These radial velocity measurements conclusively eliminated the possibility that the observed dips in KOI-423's brightness were caused by the movements of binary stars and confirming the existence of planet KOI-423b in the process. SOPHIE's measurements were used to derive KOI-423's spectrum, which was used to define KOI-423b's characteristics.〔
The astronomers submitted the discovery paper to ''Astronomy and Astrophysics'' on June 16, 2011 with François Bouchy as the leading author. The discovery paper covered the investigations of KOI-410 and KOI-552 along with the discovery of KOI-423b.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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