Exoplanets in the Antarctic Sky I. The first data release of AST3-II (CHESPA) and new found variables within the southern CVZ of TESS

Zhang, Hui and Yu, Zhouyi and Liang, Ensi and Yang, Ming and Ashley, Michael C.B. and Cui, Xiangqun and Du, Fujia and Fu, Jianning and Gong, Xuefei and Gu, Bozhong and Hu, Yi and Jiang, Peng and Liu, Huigen and Lawrence, Jon and Liu, Qiang and Li, Xiaoyan and Li, Zhengyang and Ma, Bin and Mould, Jeremy and Shang, Zhaohui and Suntzeff, Nicholas B. and Tao, Charling and Tian, Qiguo and Tinney, C. G. and Uddin, Syed A. and Wang, Lifan and Wang, Songhu and Wang, Xiaofeng and Wei, Peng and Wright, Duncan and Wu, Xuefeng and Wittenmyer, Robert A. and Xu, Lingzhe and Yang, Shi-hai and Yu, Ce and Yuan, Xiangyan and Zheng, Jessica and Zhou, Hongyan and Zhou, Ji-lin and Zhu, Zhenxi (2019) Exoplanets in the Antarctic Sky I. The first data release of AST3-II (CHESPA) and new found variables within the southern CVZ of TESS. Astrophysical Journal, Supplement Series, 240 (2 - Article 16). pp. 1-32. ISSN 0067-0049

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Abstract

Located at Dome A, the highest point of the Antarctic plateau, the Chinese Kunlun station is considered to be one of the best ground-based photometric sites because of its extremely cold, dry, and stable atmosphere. A target can be monitored from there for over 40 days without diurnal interruption during a polar winter. This makes Kunlun station a perfect site to search for short-period transiting exoplanets. Since 2008, an observatory has existed at Kunlun station, and three telescopes are working there. Using these telescopes, the AST3 project has been carried out over the last 6 yr with a search for transiting exoplanets as one of its key programs (CHESPA). In the austral winters of 2016 and 2017, a set of target fields in the southern continuous viewing zone (CVZ) of TESS were monitored by the AST3-II telescope. In this paper, we introduce the CHESPA and present the first data release containing photometry of 26,578 bright stars (m(i) <= 15). The best photometric precision at the optimum magnitude for the survey is around 2 mmag. To demonstrate the data quality, we also present a catalog of 221 variables with a brightness variation greater than 5 mmag from the 2016 data. Among these variables, 179 are newly identified periodic variables not listed in the AAVSO database (https://www.aavso.org/), and 67 are listed in the Candidate Target List. These variables will require careful attention to avoid false-positive signals when searching for transiting exoplanets. Dozens of new transiting exoplanet candidates will be released in a subsequent paper.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published version deposited in accordance with the copyright policy of the publisher.
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 09 Sep 2019 04:30
Last Modified: 10 Sep 2019 04:48
Uncontrolled Keywords: binaries, eclipsing, catalogs, planets and satellites, detection, stars, variables, surveys, photometric
Fields of Research : 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Identification Number or DOI: 10.3847/1538-4365/aaec0c
URI: http://eprints.usq.edu.au/id/eprint/36916

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