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WASP-24b is a Hot Jupiter detected in the orbit of the F-type star WASP-24. The planet is approximately the same size and mass of Jupiter, but it orbits at approximately 4% of the mean distance between the Earth and the Sun every two days. WASP-24b was observed by SuperWASP starting in 2008; after two years of observations, follow-ups led to the collection of the information that led to the planet's discovery. ==Discoveries== Between March 5, 2008 and March 9, 2009, WASP-24 was under the observation of both the Northern and Southern branches of the SuperWASP project, a ground-based consortium aiming to discover planets that transit (cross in front of) their host stars with respect to Earth. 9,750 data points were collected for the light curve; the star was flagged as host to possible transit events, prompting a team of astronomers from Europe and the United States to conduct follow-up observations.〔 The Fibre-Fed Echelle Spectrograph (FIES) on the Roque de los Muchachos Observatory's Nordic Optical Telescope provided radial velocity measurements for the system; additional calibrations during the observational period also provided the spectrum of the star. Ten Doppler spectroscopy observations were collected between December 31, 2008 and April 10, 2009. Follow-ups between January 29, 2009 and July 26, 2009 were conducted using the CORALIE spectrograph on the Leonhard Euler Telescope at La Silla Observatory, broadening knowledge of the star's spectrum, and collecting additional radial velocity measurements. These observations revealed that a body of planetary mass was orbiting the star. Analysis of the data led to the rejection of other false positive scenarios, and later, to the confirmation of the planet WASP-24b.〔 Because of the star's position in the sky, WASP-24 was visible to both the Faulkes Telescope North on Maui and the Faulkes Telescope South in Australia. The telescopes were used to observe the star's light, thereby detecting times when WASP-24b might have transited its star. The Faulkes telescopes collected data on two complete transits and one partial one. During this period, a nearby eclipsing binary star called N1 was considered and avoided to avoid contaminating the collected light samples.〔 Information collected by the Faulkes telescopes was extrapolated to reveal the characteristics of the star, and from there of the planet. The planet's discoverers compared it to HD 189733 b, which resembles WASP-24b in orbit length, mass, and radius.〔 The planet's discovery was first reported on the SuperWASP website.〔 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「WASP-24b」の詳細全文を読む スポンサード リンク
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