Exoplanets in the Antarctic Sky. V. The Second Data Release of AST3-II/CHESPA and Newly Found Variables within the Southern Continuous Viewing Zone of TESS
Located at Dome A, the highest point on the Antarctic plateau, China’s Kunlun station is a premier ground-based photometric observatory. Its cold, dry, and stable atmosphere allows continuous observation for over 40 days during polar winter, ideal for detecting short-period transiting exoplanets. Si...
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IOP Publishing
2025-01-01
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| Online Access: | https://doi.org/10.3847/1538-4365/adce81 |
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| author | Bixuan Zhao Hui Zhang Michael C. B. Ashley Jiapeng Zhu Huigen Liu Zhouyi Yu Dan Zhou Bin Ma Jeremy Mould Robert A Wittenmyer Xiangyan Yuan Zhengyang Li Xiaoyan Li Jianning Fu Jilin Zhou Lifan Wang |
| author_facet | Bixuan Zhao Hui Zhang Michael C. B. Ashley Jiapeng Zhu Huigen Liu Zhouyi Yu Dan Zhou Bin Ma Jeremy Mould Robert A Wittenmyer Xiangyan Yuan Zhengyang Li Xiaoyan Li Jianning Fu Jilin Zhou Lifan Wang |
| author_sort | Bixuan Zhao |
| collection | DOAJ |
| description | Located at Dome A, the highest point on the Antarctic plateau, China’s Kunlun station is a premier ground-based photometric observatory. Its cold, dry, and stable atmosphere allows continuous observation for over 40 days during polar winter, ideal for detecting short-period transiting exoplanets. Since 2008, the Antarctic Survey Telescopes (AST3) project has pursued the CHESPA program to search for exoplanet candidates. During the austral winters in 2016 and 2017, the AST3-II telescope surveyed fields located in the southern continuous viewing zone of the Transiting Exoplanet Survey Satellite (TESS). This paper presents the second data release from CHESPA, encompassing photometric data for over 85,000 bright ( m _i ≤ 15) stars. The survey achieved a photometric precision of approximately 2 mmag at optimal brightness levels. To illustrate the data quality, we present a catalog of 203 newly identified variable stars showing brightness variations over 5 mmag based on the 2017 observations, as compared to Data Release 1. Among these, 26 are newly recognized periodic variables that are not listed in the AAVSO database ( https://www.aavso.org/ ), and 86 are in the TESS Candidate Target List. These variables required rigorous examination to eliminate false-positive signals in the transiting exoplanets search. |
| format | Article |
| id | doaj-art-61875e39b4bb47308106fdce1c148f1b |
| institution | OA Journals |
| issn | 0067-0049 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal Supplement Series |
| spelling | doaj-art-61875e39b4bb47308106fdce1c148f1b2025-08-20T02:34:44ZengIOP PublishingThe Astrophysical Journal Supplement Series0067-00492025-01-0127824710.3847/1538-4365/adce81Exoplanets in the Antarctic Sky. V. The Second Data Release of AST3-II/CHESPA and Newly Found Variables within the Southern Continuous Viewing Zone of TESSBixuan Zhao0https://orcid.org/0000-0002-1007-1991Hui Zhang1https://orcid.org/0000-0003-3491-6394Michael C. B. Ashley2https://orcid.org/0000-0003-1412-2028Jiapeng Zhu3https://orcid.org/0000-0002-8775-4387Huigen Liu4https://orcid.org/0000-0001-5162-1753Zhouyi Yu5https://orcid.org/0000-0001-8541-7769Dan Zhou6Bin Ma7Jeremy Mould8Robert A Wittenmyer9Xiangyan Yuan10Zhengyang Li11Xiaoyan Li12https://orcid.org/0000-0002-7710-1331Jianning Fu13https://orcid.org/0000-0001-8241-1740Jilin Zhou14https://orcid.org/0000-0003-1680-2940Lifan Wang15https://orcid.org/0000-0001-7092-9374Shanghai Astronomical Observatory , Chinese Academy of Sciences, Shanghai 200030, People’s Republic of China ; zhangh@shao.ac.cnShanghai Astronomical Observatory , Chinese Academy of Sciences, Shanghai 200030, People’s Republic of China ; zhangh@shao.ac.cnSchool of Physics, University of New South Wales , Sydney 2052, AustraliaShanghai Astronomical Observatory , Chinese Academy of Sciences, Shanghai 200030, People’s Republic of China ; zhangh@shao.ac.cnSchool of Astronomy and Space Science, Nanjing University , Nanjing 210023, People’s Republic of China; Key Laboratory of Modern Astronomy and Astrophysics , Ministry of Education, Nanjing 210023, People’s Republic of ChinaSchool of Astronomy and Space Science, Nanjing University , Nanjing 210023, People’s Republic of China; Key Laboratory of Modern Astronomy and Astrophysics , Ministry of Education, Nanjing 210023, People’s Republic of ChinaShanghai Astronomical Observatory , Chinese Academy of Sciences, Shanghai 200030, People’s Republic of China ; zhangh@shao.ac.cnSchool of Physics and Astronomy, Sun Yat-sen University , Zhuhai 519082, People’s Republic of China; CSST Science Center for the Guangdong-Hong Kong-Macau Greater Bay Area , Zhuhai 519082, People’s Republic of ChinaCentre for Astrophysics and Supercomputing, Swinburne University of Technology , P.O. Box 218, Mail Number H29, Hawthorn, VIC 3122, Australia; ARC Centre of Excellence for All-sky Astrophysics (CAASTRO) , AustraliaUniversity of Southern Queensland , Computational Engineering and Science Research Centre, Toowoomba, QLD 4350, AustraliaNanjing Institute of Astronomical Optics and Technology , Nanjing 210042, People’s Republic of China; Chinese Center for Antarctic Astronomy , Nanjing 210008, People’s Republic of ChinaNanjing Institute of Astronomical Optics and Technology , Nanjing 210042, People’s Republic of China; Chinese Center for Antarctic Astronomy , Nanjing 210008, People’s Republic of ChinaNanjing Institute of Astronomical Optics and Technology , Nanjing 210042, People’s Republic of ChinaInstitute for Frontiers in Astronomy and Astrophysics, Beijing Normal University , Beijing 102206, People’s Republic of ChinaSchool of Astronomy and Space Science, Nanjing University , Nanjing 210023, People’s Republic of China; Key Laboratory of Modern Astronomy and Astrophysics , Ministry of Education, Nanjing 210023, People’s Republic of ChinaChinese Center for Antarctic Astronomy , Nanjing 210008, People’s Republic of China; George P. and Cynthia Woods Mitchell Institute for Fundamental Physics Astronomy, Texas A&M University , Department of Physics and Astronomy, College Station, TX 77843 USA; Purple Mountain Observatory , Nanjing 210008, People’s Republic of ChinaLocated at Dome A, the highest point on the Antarctic plateau, China’s Kunlun station is a premier ground-based photometric observatory. Its cold, dry, and stable atmosphere allows continuous observation for over 40 days during polar winter, ideal for detecting short-period transiting exoplanets. Since 2008, the Antarctic Survey Telescopes (AST3) project has pursued the CHESPA program to search for exoplanet candidates. During the austral winters in 2016 and 2017, the AST3-II telescope surveyed fields located in the southern continuous viewing zone of the Transiting Exoplanet Survey Satellite (TESS). This paper presents the second data release from CHESPA, encompassing photometric data for over 85,000 bright ( m _i ≤ 15) stars. The survey achieved a photometric precision of approximately 2 mmag at optimal brightness levels. To illustrate the data quality, we present a catalog of 203 newly identified variable stars showing brightness variations over 5 mmag based on the 2017 observations, as compared to Data Release 1. Among these, 26 are newly recognized periodic variables that are not listed in the AAVSO database ( https://www.aavso.org/ ), and 86 are in the TESS Candidate Target List. These variables required rigorous examination to eliminate false-positive signals in the transiting exoplanets search.https://doi.org/10.3847/1538-4365/adce81Binary starsEclipsing binary starsAstrometric exoplanet detectionSky surveysCatalogsPhotometric systems |
| spellingShingle | Bixuan Zhao Hui Zhang Michael C. B. Ashley Jiapeng Zhu Huigen Liu Zhouyi Yu Dan Zhou Bin Ma Jeremy Mould Robert A Wittenmyer Xiangyan Yuan Zhengyang Li Xiaoyan Li Jianning Fu Jilin Zhou Lifan Wang Exoplanets in the Antarctic Sky. V. The Second Data Release of AST3-II/CHESPA and Newly Found Variables within the Southern Continuous Viewing Zone of TESS The Astrophysical Journal Supplement Series Binary stars Eclipsing binary stars Astrometric exoplanet detection Sky surveys Catalogs Photometric systems |
| title | Exoplanets in the Antarctic Sky. V. The Second Data Release of AST3-II/CHESPA and Newly Found Variables within the Southern Continuous Viewing Zone of TESS |
| title_full | Exoplanets in the Antarctic Sky. V. The Second Data Release of AST3-II/CHESPA and Newly Found Variables within the Southern Continuous Viewing Zone of TESS |
| title_fullStr | Exoplanets in the Antarctic Sky. V. The Second Data Release of AST3-II/CHESPA and Newly Found Variables within the Southern Continuous Viewing Zone of TESS |
| title_full_unstemmed | Exoplanets in the Antarctic Sky. V. The Second Data Release of AST3-II/CHESPA and Newly Found Variables within the Southern Continuous Viewing Zone of TESS |
| title_short | Exoplanets in the Antarctic Sky. V. The Second Data Release of AST3-II/CHESPA and Newly Found Variables within the Southern Continuous Viewing Zone of TESS |
| title_sort | exoplanets in the antarctic sky v the second data release of ast3 ii chespa and newly found variables within the southern continuous viewing zone of tess |
| topic | Binary stars Eclipsing binary stars Astrometric exoplanet detection Sky surveys Catalogs Photometric systems |
| url | https://doi.org/10.3847/1538-4365/adce81 |
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