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一个海王星大小的超大质量行星
Luca Naponiello1,2,3,4, Luigi Mancini5,6,7, Alessandro Sozzetti6
1Department of Physics, University of Rome "Tor Vergata", Rome, Italy. lnaponiello@roma2.infn.it.
Nature
|August 30, 2023
概括
在热的海王星沙漠中发现的密集的海王星大小的系外行星TOI-1853 b, 它的不同寻常组成可能是行星碰撞或向内移动的结果.
科学领域:
- 外行星科学
- 星球的形成和演化
- 天体物理学
背景情况:
- 海王星大小的行星表现出不同的组成和密度,受形成位置和大气逃逸的影响.
- 这些行星从低密度,富含的世界到有水或岩石内部的更密集的行星.
- 热海王星沙漠是靠近恒星的区域, 很少有海王星大小的行星,
研究的目的:
- 报告过境系外行星TOI-1853b的发现和特征.
- 研究TOI-1853 b的不同寻常性质及其对行星形成理论的影响.
- 了解星球的形成和进化过程.
主要方法:
- 使用过境光度测量对过境行星TOI-1853 b的观测.
- 确定行星半径 (3.46±0.08地球半径) 和轨道周期 (1.24天).
- 测量行星的质量 (73.2 ± 2.7 地球质量) 并计算其密度 (9.7 ± 0.8 g/cm3).
主要成果:
- TOI-1853 b是一个海王星大小的行星,其质量几乎是其大小类别中已知的行星的两倍.
- 这颗行星的高密度表明它是由重元素组成的,与典型的海王星大小的行星不同.
- 它的位置在热的海王星沙漠和极端密度对当前的模型来说是一个重要的难题.
结论:
- TOI-1853 b的特性挑战了传统的行星形成和进化理论.
- 它的存在可能由多次高能原行星碰撞来解释.
- 另外,它可能代表一个极其古怪的行星向内移向其主星的最终状态.
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