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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク COROT-3b ： ウィキペディア英語版 COROT-3b COROT-3b (formerly known as COROT-Exo-3b) is a brown dwarf or massive extrasolar planet with a mass 21.66 times that of Jupiter. The object orbits an F-type star in the constellation of Aquila. The orbit is circular and takes 4.2568 days to complete.〔 It was discovered by the French-led COROT mission which detected the dimming of the parent star's light as COROT-3b passes in front of it (a situation called a transit). == Physical properties == The mass of COROT-3b was determined by the radial velocity method, which involves detecting the Doppler shift of the parent star's spectrum as it moves towards and away from Earth as a result of the orbiting companion. This method usually gives only a lower limit on the object's true mass: the measured quantity is the true mass multiplied by the sine of the inclination angle between the normal vector to the orbital plane of the companion and the line of sight between Earth and the star, an angle which in general is unknown. However, in the case of COROT-3b, the transits reveal the inclination angle and thus the true mass can be determined. In the case of COROT-3b, the mass is 21.66 times the mass of the planet Jupiter. As COROT-3b is a transiting object, its radius can be calculated from the amount of light blocked when it passes in front of the star and an estimate of the stellar radius. When COROT-3b was originally discovered, it was believed to have a radius significantly smaller than that of Jupiter. This would have implied it had properties intermediate between those of planets and brown dwarfs. Later more detailed analysis revealed that the object's radius is similar to that of Jupiter, which fits with the expected properties of a brown dwarf with the mass of COROT-3b.〔 The mean density of COROT-3b is 26,400 kg/m3, greater than that of osmium under standard conditions. This high density is reached because of the extreme compression of matter in the object's interior: in fact, the radius of COROT-3b is in agreement with predictions for an object composed mainly of hydrogen. The surface gravity is correspondingly high, over 50 times the gravity felt at the surface of the Earth.〔 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「COROT-3b」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.