Starspot Modulation Detected in the Detached Eclipsing Binary KIC 8301013
Pan,Yang1; Fu,Jian-Ning1; Zong,Weikai1; Zhang,Xiaobin2; Wang,Jiaxin1; Li,Chunqian2,3
Source PublicationThe Astrophysical Journal
AbstractAbstract We investigate a short-period (P?≈?4.4 days) eclipsing binary KIC 8301013 using high-quality Kepler photometry and the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) spectroscopic data. Through the light-curve and radial-velocity synthesis using the Wilson–Devinney method, it reveals that the binary is an almost circular (e?≈?0.001), detached system composed of two late F-type main-sequence stars, with masses and radii of , R1?=?1.45?±?0.01R⊙ and M2?=?1.11?±?0.05M⊙, R2?=?1.20?±?0.01R⊙ for the primary and secondary, respectively. Besides the light variations due to the eclipses, the light curve shows quasi-sinusoidal variations that could be ascribed to starspot modulation. After removing the synthetic binary light curve from the detrended Kepler data, we measure the periods of the active region rotation by using the autocorrelation function (ACF) and Lomb–Scargle periodograms, the decay timescale of the active region by fitting the ACF of out-of-eclipse residuals, and the size of the active region represented by the rms scatter of the out-of-eclipse residuals. The activity level on the binary is significantly stronger than the Sun and has a better agreement with individual F-type stars. No periodic changes are detected in the active region evolution. Thus, KIC 8301013 is an interesting sample for the study of starspot modulation.
KeywordEclipsing binary stars Starspots Stellar rotation
WOS IDIOP:0004-637X-905-1-abc250
PublisherThe American Astronomical Society
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Document Type期刊论文
Corresponding AuthorFu,Jian-Ning
Affiliation1.Department of Astronomy, Beijing Normal University, Beijing 100875, People’s Republic of China;
2.Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, People’s Republic of China
3.School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
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GB/T 7714
Pan,Yang,Fu,Jian-Ning,Zong,Weikai,et al. Starspot Modulation Detected in the Detached Eclipsing Binary KIC 8301013[J]. The Astrophysical Journal,2020,905(1).
APA Pan,Yang,Fu,Jian-Ning,Zong,Weikai,Zhang,Xiaobin,Wang,Jiaxin,&Li,Chunqian.(2020).Starspot Modulation Detected in the Detached Eclipsing Binary KIC 8301013.The Astrophysical Journal,905(1).
MLA Pan,Yang,et al."Starspot Modulation Detected in the Detached Eclipsing Binary KIC 8301013".The Astrophysical Journal 905.1(2020).
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