重力的に不安定な円盤の断片化によって形成された三重原星系
John J Tobin1,2, Kaitlin M Kratter3, Magnus V Persson2,4
1Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma, 440 W. Brooks Street, Norman, Oklahoma 73019, USA.
Nature
|October 28, 2016
まとめ
L1448 IRS3B 三重原星系の観測は,螺旋状の円盤構造を明らかにした. これは原星盤の重力不安定を示唆し,二重星と複数の星形成のモデルと一致している.
科学分野:
- 天文学と天体物理学
- 星 の 形成 と 進化
背景:
- 双星系や複数の星系は一般的であり,渦巻分裂や円盤分裂によって形成される.
- 乱流の断片化の観察的証拠は存在しますが,ディスクの断片化の証拠は以前は進化したシステムから推測されていました.
- L1448 IRS3Bの三重プロトスターシステムは,円盤の断片化を研究するための初期段階のコンパクトな環境を提供します.
研究 の 目的:
- 星形成の初期段階における 円盤の断片化の証拠を調査する
- L1448 IRS3Bシステムの原星円盤の構造と動態を分析する.
主な方法:
- 塵と分子ガス放出の観測
- 原星の円盤内の螺旋構造の分析
- 原星分離と質量の決定.
主要な成果:
- L1448 IRS3Bの3つのプロトスターの周りに螺旋状の円盤構造が観測された.
- 中央の2つの原星は61AUで隔てられ,三次元の原星は183AUで渦巻きの腕の中にいる.
- 円盤は,三次元の原星の位置と一致する150-320AUの間の断片化に対する感受性を示しています.
結論:
- この発見は,重力不安定による原星円盤の断片化理論を支持している.
- これは,複数の星系を形成するメカニズムとして円盤の断片化の直接的な観測証拠を提供します.
- L1448 IRS3Bシステムは,初期バイナリ/複数星の形成を理解するための重要なケーススタディとして機能します.
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