J/ApJS/278/47ivo://CDS.VizieR/J/ApJS/278/47doi:10.26093/cds/vizier/bb-8p-1fCDSZhao B.Zhang H.Ashley M.C.B.Zhu J.Liu H.Yu Z.Zhou D.Ma B.,Mould J.Wittenmyer R.A.Yuan X.Li Z.Li X.Fu J.Zhou J.Wang L.2026-08-03T07:26:32Z2026-03-24T12:32:27ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frexoplanetsvariable-starsphotometryvisible-astronomystellar-massessurveysLocated 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.2025ApJS..278...47Zhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/278/47CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-)II/336 : AAVSO Photometric All Sky Survey (APASS) DR9 (Henden+, 2016)IV/38 : TESS Input Catalog - v8.0 (TIC-8) (Stassun+, 2019)IV/39 : TESS Input Catalog version 8.2 (TIC v8.2) (Paegert+, 2021)J/ApJ/628/411 : Identification and analysis of EBs (Devor+, 2005)J/A+A/499/967 : Long-term monitoring of {gamma} Dor stars (Cuypers+, 2009)J/AJ/153/104 : Variables observed in the Gal. disk by AST3-1 (Wang+, 2017)J/MNRAS/479/111 : AST3-1 Point Source Catalogue (Ma+, 2018)J/AJ/156/102 : The TESS Input Catalog and Cand. Target List (Stassun+, 2018)J/ApJS/240/16 : Exoplanets in the Antarctic sky. I. AST3-II DR1 (Zhang+, 2019)J/ApJS/240/17 : Exoplanets in the Antarctic sky. II. (Zhang+, 2019)J/AcA/73/127 : OGLE-IV Gal. bulge fields transiting planets (Mroz+, 2023)http://casdc.china-vo.org/archive/ast3/II/dr2/ : Full data releasehttp://exoplanetarchive.ipac.caltech.edu/ : Exoplanet archive Caltechhttp://www.aavso.org/ : AAVSO homepagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/278/47https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/278/47http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/278/47https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/278/47https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/278/47http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/278/47GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/278/47/table1 (Variables from AST3-II (CHESPA) observation DR1 in 2016 and DR2 in 2017)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/278/47/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/278/47/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/278/47/table1?GETtext/xml+votable180.050000true111.2878-70.40380.0055555555555555564/2344 5/9348-9350 9352-9353 9355-9356 9358 9389 9402 9732-9733 9737 9740 6/37051 37054 37383 37387 37389-37391 37404 37406-37407 37417-37419 37428 37430-37431 37436-37438 37448 37450 37472 37474-37475 37480 37482 37520 37522-37526 37529-37532 37534-37536 37552 37554-37555 37560-37561 37563-37565 37567 37569 37571 37576-37578 37580 37602 38917 38919 38925 38927 38937-38938 38940 38942-38943 38952-38953 38955-38956 38964 38968 38970 38972 38976 39041 39043-39044 39046-39049 39052https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/278/47?format=asciiOpticaldefaultJ/ApJS/278/47/table1Variables from AST3-II (CHESPA) observation DR1 in 2016 and DR2 in 2017recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintAST3IITarget identifier (DDD.dddd+DD.dddd; J2000) (1)meta.id;meta.maincharm_AST3II2: source in DR1 and DR2; otherwise 1meta.code.multipintnullableimag[7.57/15.35] APASS catalog apparent i band magnitudemagphot.mag;em.opt.IfloatAPASSDisplay the APASS DR9 cat. (II/336) within 0.3"meta.ref.urlcharTIC? TESS Input Catalog Identifier (2)meta.idlongnullableTmag[6.6/14.7]? TESS band apparent magnitude (2)magphot.mag;em.optfloatnullableRs[0.49/16.81]? Stellar radius (2)solRadphys.size.radiusdoublenullableMs[0.49/2.14]? Stellar mass (2)solMassphys.massdoublenullableSimbadSimbad column added by the CDSmeta.ref.urlcharCTL[0/1] Candidate Target List flag (3)meta.codeintS18Display data from Stassun+, 2018, J/AJ/156/102meta.ref.urlcharAAVSOAAVSO notationmeta.id.crosscharPerA[0.07/5.53]? Period from AAVSO databasedtime.perioddoublenullableTypeAType from AAVSO database (4)meta.code;src.varcharPer[0.048/6.13] AST3-II perioddtime.perioddoubleTypeAST3-II type (5)meta.code;src.varcharCatCatalog identifier (6)meta.id;meta.tablecharDR1Display the DR1 data (Zhang+ 2019, J/ApJS/240/16) within 1"meta.ref.urlintnullable_RAPositions from AST3II names (right ascension part)degpos.eq.ra;meta.main_DEPositions from AST3II names (declination part)degpos.eq.dec;meta.mainJ/ApJS/278/47/lcsAST3-II DR2 detrended light curves list; table added by CDSrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFieldAST3-II field (Tess004 to Tess048)meta.id;obs.fieldcharimag[7/16] i-band magnitude in APASS databasemagphot.mag;em.opt.IfloatAST3IITarget identifier (DDD.dddd+DD.dddd; J2000) as in Table 1meta.id;meta.maincharprimaryFileNameFile name in subdirectory: lightcurves/ Field/decorr_aperture_auto_coadded_0m/binned_1m/ epd_binned_tfa500_svd8/tfa_step2_data/meta.id;meta.filecharPer[0.048/6.13]? AST3-II period from Table 1dtime.perioddoublenullableVarDetected variable (link to Table 1)meta.ref.urlintnullableLCInteractive light curve plot for this sourcemeta.ref.urlchar