论文标题
在G和K星星的竖琴光谱中寻找星空
Hunt for Starspots in HARPS Spectra of G and K Stars
论文作者
论文摘要
我们提出了一种使用高分辨率分子光谱模板的互相关函数（CCF）检测酷星上的星形的方法，该模板应用于用竖琴/竖琴-N观察到的G和K恒星的档案高分辨率光谱。我们报告了即使发现太阳，太阳的阳光，太阳能双胞胎18天蝎座以及非常斑点的阳光般的恒星HAT-P-11，这表明类似于日光的星形分布将对CCF技术看不见，并且不应产生对ExapeTures Overoplanet的分子吸收信号。我们检测到T Tauri K-Dwarfs LKCA 4和AA Tau中的强大TIO吸收，与凉爽区域的显着覆盖范围一致。我们表明，尽管非探测器，该技术对M矮人的相对较小的斑点和阳光恒星的大星形区域敏感。
We present a method for detecting starspots on cool stars using the cross-correlation function (CCF) of high resolution molecular spectral templates applied to archival high-resolution spectra of G and K stars observed with HARPS/HARPS-N. We report non-detections of starspots on the Sun even when the Sun was spotted, the solar twin 18 Scorpii, and the very spotted Sun-like star HAT-P-11, suggesting that Sun-like starspot distributions will be invisible to the CCF technique, and should not produce molecular absorption signals which might be confused for signatures of exoplanet atmospheres. We detect strong TiO absorption in the T Tauri K-dwarfs LkCa 4 and AA Tau, consistent with significant coverage by cool regions. We show that despite the non-detections, the technique is sensitive to relatively small spot coverages on M dwarfs and large starspot areas on Sun-like stars.
