论文标题
近距离球星的修订的启动模式
Revised instellation patterns for close-in exoplanets
论文作者
论文摘要
通常使用反向辐射定律来计算行星大气或表面顶部的启动分布。这是基于以下假设：宿主恒星足够远，可以被视为点大小的兰伯特来源。对于太阳系行星和大多数系外行星，必须修订此假设，以进行近距离行星。这项工作的目的是为近距离行星提供准确的启动模式，为此，必须考虑到恒星的球形形状的影响。首先，得出了缓解量的分析公式，将恒星和行星作为3-D身体衍生而来，并结合了恒星的肢体变暗作用。然后，使用数值技术来计算近距离行星上的日期分布，这是广泛的恒星和行星特性的纬度函数。在近距离行星上的恒星和行星特性的分布显着偏差及其在近距离行星上的分布，与恒星和恒星limb-darkerar limb-darkent效应的物理大小相似。 SUSBTELLAR点的日光度总是比标准计算高21％。终结器的替代经度可以显着在夜间延伸，从90度到已知的系外行星的90度到110度。
The distribution of instellation at the top of a planet's atmosphere or surface is usually calculated using the inverse-square law of radiation. This is based on the assumption that the host star is far enough to be considered a point-sized Lambertian source. This assumption, which works well for the solar system planets and most exoplanets, must be revised for close-in exoplanets. The objective of this work is to derive accurate instellation patterns for close-in exoplanets, for which the effects of the spherical shape of the star must be taken into account. First an analytical formula of the insolation as a function of latitude was derived, taking the star and the planet as 3-D bodies, and incorporating the limb darkening effects of the star. Then numerical techniques were used to compute the distribution of the insolation on close-in planets as a function of latitude for a wide range of stellar and planetary properties.There are significant deviations in instellation values and their distribution on close-in exoplanets, due in similar proportions to the physical size of the star and stellar limb-darkening effects. The insolation at the susbtellar point is always higher -- by as much as 21% for known exoplanets -- than the standard calculation. The substellar longitude of the terminator can significantly extend on the nightside, from 90 degrees up to 110 degrees for known exoplanets.
