Exoplanets in the Antarctic sky. III. Stellar flares Found by AST3-II (CHESPA) within the southern CVZ of TESS

En-Si Liang, Hui Zhang, Zhouyi Yu, Ming Yang, Ji-lin Zhou, Michael C. B. Ashley, Xiangqun Cui, Fujia Du, Jianning Fu, Xuefei Gong, Bozhong Gu, Lei Hu, Yi Hu, Peng Jiang, Huigen Liu, Jon Lawrence, Qiang Liu, Xiaoyan Li, Zhengyang Li, Bin MaJeremy Mould, Zhaohui Shang, Tianrui Sun, Nicholas B. Suntzeff, Charling Tao, Qiguo Tian, C. G. Tinney, Syed A. Uddin, Lifan Wang, Songhu Wang, Xiaofeng Wang, Peng Wei, Duncan Wright, Xuefeng Wu, Robert A. Wittenmyer, Lingzhe Xu, Shihai Yang, Ce Yu, Xiangyan Yuan, Jessica Zheng, Hongyan Zhou, Zhenxi Zhu

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

The CHinense Exoplanet Searching Program from Antarctica is a ground-based wide-field photometric survey using the AST3 and CSTAR telescopes located at Dome A, Antarctica. Blessed with the unparalleled observing conditions on the highest point of the Antarctic plateau, three remotely controlled, fully automatic telescopes (AST3-I, AST3-II, and CSTAR-II) carried out continuous high-precision photometric surveys through the polar nights of 2016 and 2017. During the observing seasons of 2016, a total of 26,578 light curves were obtained for stars within the area of the southern continuous viewing zone of TESS, covering an i-band magnitude range from 7.5 to 15. At mi = 10, photometric precision reaches ∼2 mmag, allowing possible discoveries of sub-Jupiter-size exoplanets. Here we report 20 stellar flares with i-band energies larger than 1034 erg detected in the 2016 data set of AST3-II, all from different sources. We model the stellar flares and calculate the durations, amplitudes, energies, and skewnesses. The flare properties and the stellar properties of their sources are presented in this work.

Original languageEnglish
Article number201
Pages (from-to)1-12
Number of pages12
JournalAstronomical Journal
Volume159
Issue number5
DOIs
Publication statusPublished - 1 May 2020

Bibliographical note

Copyright 2020 The American Astronomical Society. First published in The Astronomical Journal, 159(5), 201, 2020. The original publication is available at https://doi.org/10.3847/1538-3881/ab7ea8, published by IOP Publishing. Version archived for private and non-commercial use with the permission of the author/s and according to publisher conditions. For further rights please contact the publisher.

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