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相互作用しない低質量ブラックホール-巨大星双星系
Todd A Thompson1,2,3, Christopher S Kochanek4,2, Krzysztof Z Stanek4,2
1Department of Astronomy, The Ohio State University, 140 W. 18th Ave., Columbus, OH 43210, USA. thompson.1847@osu.edu.
Science (New York, N.Y.)
|November 2, 2019
まとめ
研究者達は 放射速度と光測定データを用いて 巨大な恒星の 巨大で見えない仲間を発見しました この非相互作用するブラックホールや中性子星系は,このような二重星系に対する以前の検出方法に挑戦しています.
科学分野:
- 天文学と天体物理学
- 星の進化について
- バイナリーシステム
背景:
- X線放射は,従星を持つブラックホールの二重星系を検出するための典型的な方法です.
- 相互作用しないバイナリが一般的であると予測されていますが,代替検出戦略が必要です.
- この研究は,間接的な観察方法によってそのようなシステムを特定することに焦点を当てています.
研究 の 目的:
- 巨大な恒星2MASS J05215658+4359220の 巨大で見えない同伴者の性質を調査する
- 相互作用しないバイナリーシステムの検出のための新しい方法を実証します.
- 目に見えない仲間を 束縛するために
主な方法:
- 放射速度測定と光度測定のデータを組み合わせる
- バイナリーシステムの軌道周期と離心率を分析する.
- 観測可能な巨星の恒星パラメータを用いて 伴星の性質を推測する.
主要な成果:
- 明るい巨星2MASS J05215658+4359220は,巨大な見えない伴星と二重星系にあることが確認されました.
- 軌道の周期は約83日であり,離心度はほぼゼロである.
- 目に見えない同伴者の質量は 太陽の5~10倍の量で 質量が少ないブラックホールや 質量のある中性子星と一致します
結論:
- この発見は,相互作用しないブラックホールのバイナリが,放射速度と光度変動分析を組み合わせて検出できることを示唆しています.
- 検出された伴侶は低質量ブラックホールか 異常な質量を持つ中性子星であり,コンパクトな物体の形成に関する新しい洞察を提供します.
- この研究は,X線を放出しない二重星系を発見するための代替方法を探求することの重要性を強調しています.
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