51分軌道周期の二重惑星で,0.1太陽質量の恒星が密集している

Kevin B Burdge^1,2, Kareem El-Badry^3,4,5, Thomas R Marsh⁶

¹Department of Physics, Massachusetts Institute of Technology, Cambridge, MA, USA. kburdge@mit.edu.

Nature

|October 5, 2022

まとめ

ZTF J1813+4251を発見しました 51分間の軌道周期を持つユニークなバイナリ系ですこの大災害変数 (CV) は重要な欠落リンクであり,ヘリウムCVになる方向に進化しています.

科学分野:

* 天文学と天体物理学
* 星の進化
* コンパクトバイナリーシステム

背景:

* 災害変数 (Cataclysmic variables, CVs) は,伴星から白矮星が形成される二重星系である.
* CVの短い軌道周期 (<75分) は稀であり,進化したドナー星を示唆する.
* 移行 CV はヘリウム CV の祖先であると仮定されていますが,短期間システムにはギャップがあります.

研究の目的:

* ZTF J1813+4251の性質を調査するために,新発見の短期間エクリプスバイナリ.
* このシステムは,CVの欠けている進化のリンクを表すかどうかを判断する.
* バイナリコンポーネントの物理的パラメータとその進化の経路を制限する.

主な方法:

* スペクトル線を分析するための相解像度スペクトロスコーピー
* 明るさの変動を研究するための多帯光曲線光度測定
* パラメータ推定のためのブロードバンドスペクトルエネルギー分布フィッティング.
* 将来の進化を予測するための恒星進化モデル

主要な成果:

* ZTF J1813+4251は,軌道周期が51分である完全な日食バイナリである.
*ドナー星はヘリウムが豊富で太陽のような温度ですが太陽の密度は100倍です
* 白い矮星とドナー星の両方の質量,半径,温度に関する正確な制約が得られました.

結論:

* ZTF J1813+4251は,ヘリウムCVになるための移行CVです.
* 水素豊富なCVと短期間のヘリウムCVの間のギャップを埋める.
* この発見は,ヘリウムCVの重要な集団の進化の経路を明らかにします.

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