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一个超太阳系行星,它穿过其母恒星的圆盘

Maciej Konacki¹, Guillermo Torres, Saurabh Jha

¹Division of Geological & Planetary Sciences 150-21, California Institute of Technology, Pasadena, California 91125, USA. maciej@gps.caltech.edu

|January 31, 2003

概括

天文学家使用辐射速度测量发现了一个新的系外行星,OGLE-TR-56b. 这颗高温,密集的木星质量行星轨道非常靠近它的恒星,为行星形成提供了洞察力.

科学领域:

外行星科学是外行星的科学.
恒星天体物理学恒星天体物理学
星球动力学行星动力学

背景情况:

探测系外行星的方法包括过境光度测量和辐射速度测量.
穿越系外行星是通过恒星光的周期性变暗来识别的.
以前的检测过境行星像HD209458b依赖于辐射速度首先.

研究的目的:

为了确认和描述系外行星OGLE-TR-56b.
为了调查导致OGLE-TR-56.的过境光曲线的物体的性质.
为了确定新发现的系外行星的质量,半径和密度.

主要方法:

测量了恒星OGLE-TR-56的半径速度.
分析速度变化与观测到的光曲线之间的相关性.
来自引力微镜头调查的光度数据.

主要成果:

在OGLE-TR-56中检测速度变化,与其光曲线相关联.
一个大约0.9木星质量的物体的确认.
估计行星半径为木星半径1.3,密度为0.5g/cm3.
轨道距离为0.023AU,导致高温为~1,900K.

结论:

这个物体OGLE-TR-56b是一个热的,密集的系外行星.
这颗行星是稳定的对蒸发和潮破坏,尽管它靠近恒星.
这一发现验证了用于检测穿越系外行星的辐射速度方法.

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