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Updated: May 29, 2026

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Genomic Transformation of the Picoeukaryote Ostreococcus tauri
Published on: July 13, 2012
星が惑星に変化するのは,数ミリ秒で,パルサー・バイナリ・パルサーで
M Bailes1, S D Bates, V Bhalerao
1Centre for Astrophysics and Supercomputing and ARC Centre for All-Sky Astrophysics (CAASTRO), Swinburne University of Technology, Post Office Box 218 Hawthorn, VIC 3122, Australia. mbailes@swin.edu.au
まとめ
研究者らは,単一のミリ秒パルサーであるPSR J1719-1438が,実際には2進星系にあることを発見した. その伴星は,超低質量炭素白矮星であり,パルサーの起源への手がかりを提供している可能性があります.
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
- 中性子星とは,中性子星のことです.
背景:
- ミリ秒パルサー (MSP) は,急速に回転する中性子星であり,典型的には,蓄積がそれらを回転させる二進体系で見られる.
- MSPの大部分 (約30%) が独身であり,標準的な形成モデルに挑戦しています.
- 単一のMSPの起源を理解することは,恒星の進化の完全なイメージを得るために非常に重要です.
研究 の 目的:
- 単一のミリ秒パルサーPSR J1719-1438.8の性質と起源を調査する.
- PSR J1719-1438が本当に単一なのか,それとも二進星系の一部なのかを判断する.
- パルサーの進化に伴う影響と,同伴天体の特徴を記述する.
主な方法:
- パークス64メートルの電波望遠鏡の調査から得られたデータを利用した.
- パルサー信号のタイミング分析を行い,軌道変化を検出する.
- 軌道パラメータに基づいて,同伴天体の質量と密度を計算する.
主要な成果:
- ミリ秒パルサーPSR J1719-1438は,軌道周期が2.2時間であるバイナリ系で検出されました.
- 伴侶の質量は木星の質量に匹敵する.
- 伴星の高密度 (最低23g/cm3) は,超低質量炭素白矮星であることを示唆しています.
結論:
- この発見は,一部のMSPの孤独な性質に異議を唱え,バイナリ形成経路の証拠を提供します.
- 伴侶の性質は,超コンパクトな低質量X線バイナリとして過去を暗示しています.
- このシステムは,二重星の極端な進化と,増殖期間の同伴者の生存についての洞察を提供します.
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