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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 Sub-brown dwarf ： ウィキペディア英語版 Sub-brown dwarf A sub-brown dwarf or planetary-mass brown dwarf is an astronomical object formed in the same manner as stars and brown dwarfs (i.e. through the collapse of a gas cloud) but that has a mass below the limiting mass for thermonuclear fusion of deuterium (about ).〔(Working Group on Extrasolar Planets – Definition of a "Planet" ) POSITION STATEMENT ON THE DEFINITION OF A "PLANET" (IAU)〕 Some researchers call them free-floating planets whereas others call them planetary-mass brown dwarfs. ==Sub-brown dwarf or free-floating planet== Sub-brown dwarfs are formed in the manner of stars, through the collapse of a gas cloud (perhaps with the help of photo-erosion) but there is no consensus amongst astronomers on whether the formation process should be taken into account when classifying an object as a planet.〔(What is a Planet? Debate Forces New Definition ), by Robert Roy Britt, 02 November 2000〕 Free-floating sub-brown dwarfs can be observationally indistinguishable from rogue planets that originally formed around a star and were ejected from orbit, and on the other hand a sub-brown dwarf formed free-floating in a star cluster may get captured into orbit around a star. A definition for the term "sub-brown dwarf" was put forward by the IAU Working Group on Extra-Solar Planets (WGESP), which defined it as a free-floating body found in young star clusters below the lower mass cut-off of brown dwarfs.〔IAU WGESP, ('Position Statement on the Definition of "Planet"' ), 28 February 2003〕 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「Sub-brown dwarf」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.