熱く速い超新星で,コンパクトな中性子星双星を形成したと思われる

K De¹, M M Kasliwal², E O Ofek³

¹Cahill Centre for Astrophysics, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125, USA. kde@astro.caltech.edu.

Science (New York, N.Y.)

|October 13, 2018

まとめ

IPTF 14gqrという珍しいタイプIcの超新星を発見し超脱光超新星の存在を直接証明しましたこの発見は,コンパクトな中性子星の二重星系の形成に光を当てています.

科学分野:

天文学と天体物理学
スター進化
超新星物理学

背景:

コンパクトな中性子星の二重星系は恒星の進化と重力波の源を理解するために不可欠です
これらのシステム,特に超新星メカニズムにつながる最終的な進化段階は,十分に理解されず,観察されていないままです.

研究の目的:

コンパクトな中性子星の二重星系の形成経路を調査する.
超新星観測の証拠を提供するためです

主な方法:

初期のフォトメトリとスペクトロスコピーを用いて,特殊なタイプIc超新星,iPTF 14gqr (SN 2014ft) の発見と分析.
超新星の光の曲線とスペクトルの特徴を特徴付け,噴出質量と運動エネルギーを決定する.

主要な成果:

iPTF 14gqrは,非常に低い放出質量 (≈0.2太陽質量) と運動エネルギー (≈2 × 10^50 ergs) を示す,急速に進化する光曲線を示している.
膨張したヘリウムに富んだ封筒からの衝撃冷却の証拠は爆発前の恒星の激しい質量損失を示唆しています

結論:

iPTF 14gqrは,超脱落超新星の最初の観測証拠として解釈されています.
この発見は超新星がコンパクトな二重星系の中でニュートロン星を形成する重要な経路であるという説を裏付けている.

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