パルサーB1620-26の若い白矮星:初期の惑星形成の証拠

Steinn Sigurdsson¹, Harvey B Richer, Brad M Hansen

¹525 Davey Laboratory, Department of Astronomy, Pennsylvania State University, University Park, PA 16802, USA. steinn@astro.psu.edu

Science (New York, N.Y.)

|July 12, 2003

まとめ

天文学者は,ハッブル宇宙望遠鏡のデータを用いて,パルサーB1620-26に同伴する低質量白矮星を発見した. この発見は,低金属度球体群の初期の惑星形成を支持している.

科学分野:

* 天文学と天体物理学
* エクソプラネット・サイエンス
* 恒星の進化について

背景:

*パルサーB1620-26系は,同伴星を宿していることが知られている.
* 過去の研究では,恒星と惑星の両方の質量の物体の存在が示唆されていました.

研究の目的:

*パルサーB1620-26.6の恒星の伴星を検出し,特徴づけること.
* 三重系の形成史と動態を制限するため.
*球状星団における惑星形成の発生率と時期を推論する.

主な方法:

* ハッブル宇宙望遠鏡 (HST) の観測を活用した.
* 恒星の同伴星の色と大きさを分析した.
* 質量と年齢を決定するために,恒星の進化モデルを適用した.

主要な成果:

* 低質量白矮星の伴星を検出しました.
*その質量は0.34 +/- 0.04太陽質量であると決定しました.
* 推定年齢は480 x 10^6 +/- 140 x 10^6年でした.

結論:

* システムの構成は,クラスター・コアにおけるダイナミック・エクスチェンジ・インタラクションの結果である可能性が高い.
* 低金属度球状星団では惑星が一般的かもしれない.
* 惑星の形成は,これまで考えられていたよりも,より広範に広がり,より早く起こる可能性があります.

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