论文标题
Faculae对系外行星半径测定的影响：M-Star GJ1214的情况
The impact of faculae on the radius determination of exoplanets: The case of the M-star GJ1214
论文作者
论文摘要
对于我们对这些对象的起源和性质的理解，系外行星半径的精确测量至关重要。使用过境方法对行星半径进行测量已经达到了必须考虑出色表面特征的影响的精确度。尽管已经详细研究了斑点的影响，但我们对faculae造成的影响的了解仍然有限。 M-Star尤其如此。如果Faculae不均匀地分布在恒星表面上，则可能会提出问题。使用Eclipse映射方法，我们使用CAIIH＆K线作为示踪剂研究了副群在GJ1214表面上的分布。为了以定量的方式评估分布的同质性，我们引入了不均匀性因子IHF。如果分布是均匀的，正面的，则IHF为0％，如果板块区域优先沿行星路径位于行星路径，如果优先位于行星路径之外，则IHF为负。对于GJ1214，我们得出了一个相当小的IHF = 7.7-7.7+12.0％的值。我们在柏拉图和Ariel任务的背景下讨论了这种结果的相关性。
Precise measurements of exoplanets radii are of key importance for our understanding of the origin and nature of these objects. Measurement of the planet radii using the transit method have reached a precision that the effects of stellar surface features have to be taken into account. While the effects from spots have already been studied in detail, our knowledge of the effects caused by faculae is still limited. This is particularly the case for M-stars. Faculae can pose a problem if they are inhomogeneously distributed on the stellar surface. Using the eclipse mapping method, we study the distribution of the faculae on the surface of GJ1214 using the CaIIH&K lines as tracers. In order to assess the homogeneity of the distribution in a quantitative way, we introduce the inhomogeneity factor IHF. IHF is 0% if the distribution is homogeneous, positive, if the plage regions are preferentially located along the path of the planet, and negative, if they are preferentially located outside the path of the planet. For GJ1214, we derive a rather small value of IHF=7.7-7.7+12.0%. We discuss the relevance of this result in the context of the PLATO and ARIEL missions.
