论文标题
使用列表的恒星强度快速运输计算
Fast Transit Computation Using Tabulated Stellar Intensities
论文作者
论文摘要
肢体变暗定律是恒星强度中心对limb变化的方便参数化,它们的使用在食和过境模型中无处不在。但是,从任何意义上讲,它们都不是“法律” - 它们是真实强度变化的简单近似值,随着恒星大气模型的改善和更高的精度数据,它们的局限性变得越来越明显。当拟合日食和过境光曲线时,理想情况下,人们希望使用基于恒星质量,半径和有效温度等基本恒星参数的模型强度,而不是肢体变暗的法律表示及其系数。当试图检测高阶效应(例如行星底,环,卫星或气氛)时,尤其如此。但是,使用模型强度需要在模型恒星表面上数字整合许多小区域“瓷砖”,并且传统上这在计算上对于一般使用而言过于昂贵。在这里,我们提出了一种快速技术来计算光曲线和使用列表的恒星模型强度的rossiter-mclaughlin效应。这是开发工具的一步,可以消除对四肢变黑法律的需求。
Limb darkening laws are convenient parameterizations of the stellar intensity center-to-limb variation, and their use is ubiquitous in eclipse and transit modeling. But they are not "laws" in any sense -- they are simple approximations of the real intensity variations, and their limitations are becoming more and more apparent as stellar atmosphere models improve and higher precision data become available. When fitting eclipses and transit light curves, one would ideally like to use model intensities that are based on fundamental stellar parameters such as the mass, radius, and effective temperature of the star, rather than a limb darkening law representation and its coefficients. This is especially true when attempting to detect higher-order effects such as planetary oblateness, rings, satellites, or atmospheres. However, using model intensities requires numerically integrating many small-area "tiles" on the model stellar surface(s) and this has traditionally been too computationally expensive for general use. Here we present a fast technique to compute light curves and the Rossiter-McLaughlin effect that uses tabulated stellar models intensities. This is a step in the development of tools that obviate the need for limb darkening laws.