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運営者ブログ - “太陽”が2つある土星型の系外惑星

“太陽”が2つある土星型の系外惑星

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admin_mb 2011-9-21 0:47
“太陽”が2つある土星型の系外惑星

はくちょう座の方向200光年先に新たな系外惑星が発見されたそうです。系外惑星はこれまで多数発見されていますが、今回見つかったのは、”太陽"が2つあるという点で特徴的です。恒星の質量はそれぞれ、太陽の20%と69%で共通の重心を周回しているようです。太陽が2つあるというとスターウォーズのタトゥイーンを思い出しますが、今回見つかった惑星は巨大ガス惑星とのことです。太陽は2つありますが、惑星の軌道は円に近く229日の周期で公転しているそうです。連星自体は銀河系内に200万個はくだらないそうですので、ハビタブルゾーンに固体表面のある惑星が周回する星系もあるかもしれませんね。

連星はSFの世界でも時折出てくるとは思いますが、ジェイムスン教授シリーズの「二重太陽系死の呼び声」くらいしか思い当たりません。確かアシモフの「夜来たる」は二重どころかもっと太陽が多かったように思いますし、連星のアルファ・ケンタウリが舞台になっているものもそこそこありそうですが読んだ記憶がありません。そういえば、アシモフの「ファウンデーション」シリーズの最終巻あたりで、地球を探す中でアルファ・ケンタウリの惑星を訪れるというシーンが確かありましたね。

「二重太陽系死の呼び声」ニール・R・ジョーンズ
二重太陽系死の呼び声 (ハヤカワ文庫SF)

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