Constraining the interiors of exoplanets by measuring the Love number k_2
通过测量 Love 数 k_2 来约束系外行星的内部
基本信息
- 批准号:329666757
- 负责人:
- 金额:--
- 依托单位:
- 依托单位国家:德国
- 项目类别:Research Units
- 财政年份:2017
- 资助国家:德国
- 起止时间:2016-12-31 至 2021-12-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
We will develop a new software package to model transit light curves of exoplanets with tidally and rotationally distorted components. This work is starting from an already existing code based on the Roche-model (which consists of a massless, but emitting and/or reflecting, tidally and rotationally distorted envelope, and a core in the center of the celestial object that contains the entire mass of the object). Such a model was found to be appropriate for main sequence stars. The code will be modified to make it appropriate for exoplanets. Therefore, it will be extended by non-homogeneous internalmass distribution components and it will take into account the radiation pressure caused by the host star because this is important for close-in exoplanets with extended, dense atmospheres. Since gravitational microlensing in the binary system of the planet (lense) and star (source) is thought to contribute to the observed light curve distortions, we plan to add this effect into the code. Limb darkening will be an adjustable parameter independent of existing stellar atmosphere models, but we plan to allow the user the possibility to modify this for a given stellar atmosphere model. We will improve our existing code to include stellar variability phenomena by developing and adding a red-noise (autoregressive and/or Gaussian Process) model. Then the code will be able to determine the ratio of the polar and the equatorial radii of the transiting exoplanet from a measured transit light curve.In addition, we will perform studies on applicability of multicolour photometry. Observations obtained at different wavelengths may help to resolve the degeneracy between different parametersFinally, the measured polar flattening values will be linked to the internal structure of the exoplanet. This requires knowledge of the rotational period of the exoplanet. To first approximation, we assume that the closest exoplanets are tidally locked. A more sophisticated estimate can be based on the shape-distortion, because the centrifugal force is axially symmetric while tidal forces have a characteristic orientation. The code will be able to separate these effects.The expected result of SP6 is an estimate of the polar flattening of several exoplanets and constraints for the rotational period, gravitational quadrupole moment J_2 and Lovenumber k_{2,f}. These numbers can be compared to theoretical expectations and thus can be used for further refinement of our knowledge on exoplanets' interiors.The interior models of SP4 and SP5 based on EoS data obtained by SP1-3 and SP7-9 can be used as initial estimates in our work. Then we can make predictions concerning which kind of light curve distortions can be observed. A comparison of the observed data and our model calculations may allow us to refine the k_{2,f} Love-number values and giving a feedback about the observability of polar flattening as well as the code will be able to constrain this interior structure parameter.
我们将开发一个新的软件包,以模拟潮汐和旋转扭曲组件的系外行星的过境光变曲线。这项工作是从一个已经存在的代码的基础上罗奇模型(它包括一个无质量,但发射和/或反射,潮汐和旋转扭曲的信封,和一个核心的天体的中心,包含整个质量的对象)。这样的模型被认为是适合主序星。该代码将被修改,使其适用于系外行星。因此,它将由非均匀的内部质量分布组件扩展,并将考虑宿主星星引起的辐射压力,因为这对于具有扩展的致密大气的近距离系外行星很重要。由于在行星(行星)和星星(来源)的双星系统中的引力微透镜被认为有助于观察到的光变曲线失真,我们计划将这种效应添加到代码中。临边变暗将是一个独立于现有恒星大气模型的可调参数,但我们计划允许用户修改这一给定的恒星大气模型的可能性。我们将改进我们现有的代码,通过开发和添加红噪声(自回归和/或高斯过程)模型,包括恒星的变化现象。该程序将能够根据测得的凌日光变曲线确定凌日系外行星的极径和赤道径之比。此外,我们还将对多色测光的适用性进行研究。在不同波长下获得的观测结果可能有助于解决不同参数之间的简并性。最后,测量的极地扁率值将与系外行星的内部结构联系起来。这需要了解系外行星的自转周期。在第一近似中,我们假设最近的系外行星是潮汐锁定的。更复杂的估计可以基于形状变形,因为离心力是轴对称的,而潮汐力具有特征方向。SP 6程序的预期结果是对几个系外行星的极扁率的估计,以及对自转周期、引力四极矩J_2和Lovenumber k_{2,f}的约束。这些数字可以与理论预期进行比较,因此可以用于进一步完善我们对系外行星内部的知识。基于SP1-3和SP 7 -9获得的EoS数据的SP 4和SP 5内部模型可以用作我们工作中的初始估计。然后我们可以预测可以观察到哪种光变曲线失真。将观测数据与我们的模型计算结果进行比较,可以使我们对k_{2,f} Love-number的值进行修正,并给出极线展平的可观测性反馈,而程序也可以约束这个内部结构参数。
项目成果
期刊论文数量(0)
专著数量(0)
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Professorin Dr. Heike Rauer其他文献
Professorin Dr. Heike Rauer的其他文献
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{{ truncateString('Professorin Dr. Heike Rauer', 18)}}的其他基金
Detection and Characterization of sub-Jovian Planets with NGTS (Next Generation Transit Survey)
使用 NGTS(下一代凌日巡天)探测和表征亚木星行星
- 批准号:
361969296 - 财政年份:2017
- 资助金额:
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Priority Programmes
Characterization and retrieval of atmospheric parameters of terrestrial extrasolar planets around cool host stars
冷主星周围类地系外行星大气参数的表征和反演
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282760199 - 财政年份:2015
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Untersuchung der Ausgasungsprozesse und Zusammensetzung von Kometen durch Beobachtung der Aktivität entlang des Orbits
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- 批准号:
5092712 - 财政年份:1998
- 资助金额:
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