TOSC：一种点transit弦线层析成像算法
TOSC: an algorithm for the tomography of spotted transit chords
摘要：
对行星凌日的光度观测可能会显示出局部的隆起，称为凌日异常，这是由于光球星点可能交叉造成的。本文的目的是分析凌日异常，并推导出沿凌日方向的凌日带内部温度廓线。我们开发的算法TOSC，层析逆方法的工具，通过简单的代数，重建沿过境带的通量分布。我们测试TOSC对一些模拟场景。我们发现，TOSC提供了强大的结果与测光精度优于1 mmag的光变曲线，返回的点光球温度对比度的精度优于100 K。TOSC对于未被遮蔽的光点也是稳健的，只要使用由凌日光变曲线拟合给出的视行星半径来代替真实半径。实际数据的分析与TOSC返回的结果与以前的研究一致。
英文摘要：
Photometric observations of planetary transits may show localized bumps, called transit anomalies, due to the possible crossing of photospheric starspots. The aim of this work is to analyze the transit anomalies and derive the temperature profile inside the transit belt along the transit direction. We develop the algorithm TOSC, a tomographic inverse-approach tool which, by means of simple algebra, reconstructs the flux distribution along the transit belt. We test TOSC against some simulated scenarios. We find that TOSC provides robust results for light curves with photometric accuracies better than 1~mmag, returning the spot-photosphere temperature contrast with an accuracy better than 100~K. TOSC is also robust against the presence of unocculted spots, provided that the apparent planetary radius given by the fit of the transit light curve is used in place of the true radius. The analysis of real data with TOSC returns results consistent with previous studies.
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