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一颗恒星的红外流星吞没了一个星球
Kishalay De1, Morgan MacLeod2, Viraj Karambelkar3
1Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA, USA. kde1@mit.edu.
Nature
|May 3, 2023
概括
天文学家观察到ZTF SLRN-2020,这是一颗恒星爆发, 这一事件提供了行星吞没的第一个直接证据,
科学领域:
- 天文学与天体物理学
- 外行星科学
背景情况:
- 在类似太阳的恒星周围, 轨道周期短的行星很常见.
- 进化中的恒星扩大, 导致接近的行星伴侣被吞没.
- 这种恒星进化阶段以前没有被直接观察到.
研究的目的:
- 报告首次直接观测到一个吞行星的恒星.
- 描述ZTF SLRN-2020事件及其相关的排放情况.
- 估计银河系中这种事件的发生率.
主要方法:
- 观测ZTF SLRN-2020,一个短暂的光学爆发.
- 对伴随的明亮和长寿命的红外辐射进行分析.
- 对红色新星事件进行光谱和光曲线分析.
主要成果:
- ZTF SLRN-2020的特征与红色新星相似,但亮度非常低.
- 事件的特征表明一个行星 (<10木星质量) 被类似太阳的恒星吞没.
- 估计每年有0.1到几颗红色新星.
结论:
- 首次直接观察到行星被进化中的恒星所包围.
- 潜光红色新星是一种新型的恒星爆发,由行星吞引起.
- 未来的调查将经常检测这些事件, 揭示系外行星人口和命运.
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