Systematic analysis of stellar transit light curves for the characterization of short-period extrasolar planets

系统分析恒星凌日光变曲线以表征短周期系外行星

• 批准号: 362584047
• 负责人: Privatdozent Dr. Martin Pätzold
• 金额: --
• 依托单位: Rheinisches Institut für Umweltforschung (EURAD)
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2017
• 资助国家: 德国
• 起止时间: 2016-12-31 至 2020-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/362584047?language=en
• 关键词: Systematic; analysis; stellar; transit; light

More than 3500 extrasolar planets were discovered to date. The study of a large ensemble of planetary systems of different kind may allow to conclude on the formation and evolution of planetary systems and the associated physical processes. The transit method is the most successful method for the discovery of exoplanets. Space telescopes like CoRoT, Kepler and K2 observed a large number of stars simultaneously and continuously. The orbital period; the planetary radius and the planetary semi major axis relative to the radius of the star, the inclination and eccentricity of the planetary orbit are determined from the transit by fitting analytic light curve models. The planetary mass is determined from a combination of transit and ground-based radial velocity measurements (RV) or in some cases by transit time variation (TTV). Other physical properties of planetary systems were occasionally discovered in light curves (e.g. light reflected by planets, ellipsoid variation, differential rotation of the star, angle between the stellar rotation axis and the planetary orbit, eccentricity of planetary orbits). Only crude estimates exist for other properties (e.g., apsidal precession, moons, rings, and trojans). This project shall systematically examine all existing light curves with planetary transits from the Kepler, CoRoT and K2 missions for known and/or theoretically predicted variations before, during and after the transit. The large ensemble of light curves may also build the foundation for a statistical analysis which shall characterize previously unexplained variations in the light curves which may then describe the associated physical phenomena.We want to apply our extensive experience gained from the analysis of stellar light curves and planetary transits made on the space missions CoRoT, Kepler and K2. The data already processed with our detection pipeline shall be exploited in more detail. A new numerical light curve model shall be developed. This numerical model shall be able to simulate light curve phenomena not considered in the commonly used Mandel-Agol model. The model shall give estimates if certain phenomena are detectable in the light curves with today's technique and which kind of stars may be suitable for observation (period, spectral type of star, etc.). The model shall help to clarify the physical reason of unknown phenomena. The systematic investigation of the light curves should increase the information and the number of parameters obtained directly from the light curve. In addition, the information shall be used to identify false positives.

迄今为止，发现了3500多个外星行星。对不同种类的行星系统合奏的研究可以使行星系统和相关物理过程的形成和演变得出结论。过境方法是发现系外行星的最成功方法。诸如Corot，Kepler和K2之类的空间望远镜同时且连续地观察到大量恒星。轨道时期； 行星半径和行星半轴相对于恒星的半径，行星轨道的倾斜度和偏心率是通过拟合分析光曲线模型来确定的。行星质量是由运输和地面径向速度测量（RV）或在某些情况下通过过境时间变化（TTV）的组合确定的。偶尔会在光曲线中发现行星系统的其他物理特性（例如，行星反射的光，椭圆形变化，恒星的差异旋转，恒星旋转轴之间的角度和行星轨道之间的角度，行星轨道的偏心性）。仅存在其他特性（例如Apsidal进动，卫星，环和特洛伊木马）的粗略估计。该项目应系统地检查所有现有的光曲线，并从开普勒，COROT和K2任务中进行行星转移，以在过境前，期间和之后，以进行已知和/或理论上预测的变化。光曲线的大合奏还可以为统计分析奠定基础，该分析将表征前曲线中先前无法解释的变化，然后可以描述相关的物理现象。我们希望利用从对恒星光曲线和行星交易的分析中获得的丰富经验，以及在太空使命Corot，Kepler和K2上进行的。已经使用我们的检测管道处理的数据应更详细地利用。应开发新的数值光曲线模型。该数值模型应能够模拟在常用的曼德尔 - 阿戈尔模型中未考虑的光曲线现象。 该模型应给出估计值，如果在今天的技术中可以在光曲线中检测到某些现象，哪种恒星可能适合观察（周期，光谱类型的恒星等）。该模型应有助于阐明未知现象的物理原因。对光曲线的系统研究应增加直接从光曲线获得的信息和参数数量。此外，该信息应用于识别误报。