銀河の平面にある変なバイナリミリ秒パルサー

David J Champion¹, Scott M Ransom, Patrick Lazarus

¹Department of Physics, McGill University, Montreal, QC H3A 2T8, Canada. David.Champion@atnf.csiro.au

Science (New York, N.Y.)

|May 17, 2008

まとめ

PSR J1903+0327は,太陽質量の同伴星と並外れた軌道に乗っているミリ秒パルサーです. この発見は,二重星進化とパルサー形成の従来のモデルに異議を唱えている.

科学分野:

天文学と天体物理学について
コンパクトなオブジェクトコンパクトなオブジェクト
バイナリーシステムバイナリーシステム

背景:

バイナリーパルサーシステムは,恒星の進化と極限物理学の理解に不可欠です.
ミリ秒パルサー (MSP) は,急速に回転する中性子星です.

研究の目的:

新しく発見されたラジオパルサー,PSR J1903+0327.の性質を調査するために.
その異常な軌道特性と伴星を理解するために.

主な方法:

アレシボ望遠鏡を使用して,電波パルサーを検出するための調査を行った.
伴星を特定するために赤外線観測を行った.
相対論的方法を使用してパルサーのタイミング観測を分析した.

主要な成果:

発見されたPSR J1903+0327は,周期2.15msのミリ秒パルサーです.
太陽の質量の同伴星を周回する95日間の非常に偏心的な (e=0.44) 軌道を観測した.
主相配列の伴星の可能性を特定した.
異常な高パルサー質量1.74 ± 0.04太陽質量を決定しました.

結論:

観測されたシステムは,従来のバイナリ恒星の進化モデルに挑戦しています.
球状星団の放出や階層的な三重体などの代替的な形成シナリオが提案されています.
高い質量は,このパルサーのユニークな形成または進化の経路を示唆しています.

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