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WASP-18 is a magnitude 9 star located in the Phoenix constellation of the southern hemisphere.〔(【引用サイトリンク】 work=Exoplanet Transit Database )〕 It has a mass of 1.25 solar masses.〔(PlanetQuest: WASP-18 b )〕 In 2009, the SuperWASP project announced that a large, hot Jupiter type extrasolar planet, ''WASP-18b'', was orbiting very close to this star.〔 Observations from the Chandra X-ray Observatory failed to find any X-rays coming from WASP-18, and it is thought that this is caused by WASP-18b disrupting the star's magnetic field by causing a reduction in convection in the star's atmosphere. Tidal forces from the planet may also explain the higher amounts of lithium measured in earlier optical studies of WASP-18.〔(【引用サイトリンク】url=http://chandra.harvard.edu/press/14_releases/press_091614.html )〕 ==See also== * SuperWASP * List of extrasolar planets 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-18」の詳細全文を読む スポンサード リンク
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