J/ApJS/240/16 Exoplanets in the Antarctic sky. I. AST3-II DR1 (Zhang+, 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.
Zhang H., Yu Z., Liang E., Yang M., Ashley M.C.B., Cui X., Du F., Fu J.,
Gong X., Gu B., Hu Yi, Jiang P., Liu H., Lawrence J., Liu Q., Li X., Li Z.,
Ma B., Mould J., Shang Z., Suntzeff N.B., Tao C., Tian Q., Tinney C.G.,
Uddin S.A., Wang L., Wang S., Wang X., Wei P., Wright D., Wu X.,
Wittenmyer R.A., Xu L., Yang S.-H., Yu Ce, Yuan X., Zheng J., Zhou H.,
Zhou J.-L., Zhu Z.
<Astrophys. J. Suppl. Ser., 240, 16 (2019)>
=2019ApJS..240...16Z 2019ApJS..240...16Z
ADC_Keywords: Stars, variable ; Photometry, SDSS ; Surveys
Keywords: binaries: eclipsing ; catalogs ; planets and satellites: detection ;
stars: variables: general ; surveys ; techniques: photometric
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 6yr with a search for
transiting exoplanets as one of its key programs (CHinese Exoplanet
Searching Program from Antarctica --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 (mi≤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
5mmag 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.
Description:
In the austral winters of 2016 and 2017, we used the AST3-II telescope
--located at the Chinese Kunlun station at Dome A, Antarctica-- to
survey a group of selected fields near the southern ecliptic pole and
within the southern continuous viewing zone (CVZ) of Transiting
Exoplanet Survey Satellite (TESS; Ricker+ 2009AAS...21430605R).
This first data release contains a data set obtained in the austral
winter of 2016.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 131 221 Variables from AST3-II observation in 2016
dr1lcs.dat 72 27798 AST3-II DR1 detrended light curves list;
table added by CDS
images/* . 20 Selected coadded images for the 10 fields
in FITS format
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See also:
B/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-2014)
II/336 : AAVSO Photometric All Sky Survey (APASS) DR9 (Henden+, 2016)
J/AJ/128/1748 : VR photometry of type II cepheids (Schmidt+, 2004)
J/ApJ/628/411 : Identification & analysis of eclipsing binaries (Devor+, 2005)
J/A+A/499/967 : Long-term monitoring of γ Dor stars (Cuypers+, 2009)
J/PASP/122/347 : Chinese Small Telescope ARray (CSTAR) (Zhou+, 2010)
J/AJ/142/155 : Variable stars photometry from Dome A (Wang+, 2011)
J/ApJS/218/20 : Photom. variability search in the CSTAR field (Wang+, 2015)
J/AJ/151/166 : Flares & variables from 2009-2010 CSTAR (Oelkers+, 2016)
J/AJ/153/104 : Variables observed in Galactic disk by AST3-1 (Wang+, 2017)
J/AJ/156/234 : KELT transit false positive catalog for TESS (Collins+, 2018)
J/AJ/156/102 : TESS Input Catalog and Candidate Target List (Stassun+, 2018)
J/ApJS/240/17 : Exoplanets in the Antarctic sky. II. 116 cand. (Zhang+, 2019)
http://www.njutido.com/tido/data.html : TIDO home page
http://casdc.china-vo.org/archive/ast3/II/dr1/ : China archive of AST3-II DR1
Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- --- [AST3II]
7- 14 F8.4 deg RAdeg Target right ascension (J2000)
15- 22 F8.4 deg DEdeg Target declination (J2000)
24- 28 F5.2 mag imag [7.5/15.1] APASS/Sloan i-band AB magnitude
30- 38 I9 --- TIC [41172665/453079732]? TESS Input Catalog ID (1)
40- 44 F5.2 mag Tmag [6.6/14.7]? TESS magnitude (1)
46- 52 F7.4 Rsun R*tic [0.4/17]? stellar radii, TESS input catalog (1)
54- 59 F6.4 Msun M*tic [0.4/2.2]? stellar mass, TESS Input Catalog (1)
61- 61 I1 --- Flag [0/1] CTL flag (1=target is also selected in
the target list of Stassun+ 2018, J/AJ/156/102)
63- 90 A28 --- AAVSO AAVSO names (2)
92- 98 F7.5 d PerA [0.09/5.6]? Period, from AAVSO (2)
100-115 A16 --- TypeA Type, from AAVSO (2)(3)
117-123 F7.5 d Per [0.04/6.2] Period, from AST3-II
125-131 A7 --- Type Type, from AST3-II (3)
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Note (1): TESS IDs, TESS magnitudes, stellar radii and stellar masses
from the TIC (Stassun+ 2018, J/AJ/156/102).
Note (2): Names, periods, and type designations from the AAVSO database
http://www.aavso.org/vsx/ (see also B/vsx).
Note (3): Variable-star type designations following VSX:
ACV = α2 Canum Venaticorum variables.
CEP = Cepheids.
CWB = W Virginis variables with periods shorter than 8 days; also known
as BL Herculis variables.
DSCT = variables of the δ Scuti type (those with amplitudes larger
than 0.15mag and asymmetric light curves are designated
High Amplitude δ Scuti star (HADS)).
EA (ED) = Algol eclipsing systems.
EB (ESD) = β Lyrae-type eclipsing systems.
EW (EC) = W Ursae Majoris-type eclipsing variables.
ROT = spotted stars that were not classified into a particular class.
RR (RRAB/RRC) = variables of the RR Lyrae type.
RS = RS Canum Venaticorum-type binary systems.
YSO = young stellar object of unspecified variable type
See http://www.aavso.org/vsx/index.php?view=about.vartypes
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Byte-by-byte Description of file: dr1lcs.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 7 A7 --- Field AST3-II field (Tess004 to Tess013)
9- 13 F5.2 mag imag [7/15] i-band AB magnitude in APASS database
15- 22 F8.4 deg RAdeg [90.3/117.8] Target right ascension (J2000)
23- 30 F8.4 deg DEdeg [-74.5/-68.5] Target declination (J2000)
32- 72 A41 --- FileName File name in subdirectories
lightcurves/detrended/Field
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Nomenclature note:
Sources are named <[ZYL2019] AST3II JDDD.dddd+DD.dddd> in Simbad.
History:
From electronic version of the journal for Table 4.
Light curves downloaded (in May 2019) from:
http://casdc.china-vo.org/archive/ast3/II/dr1/
(AST3IIdr1lightcurve.tar.gz)
Images sent by the author.
Acknowledgements:
Hui Zhang [Nanjing University, China]
References:
Zhang et al. Paper II. 2019ApJS..240...17Z 2019ApJS..240...17Z Cat. J/ApJS/240/17
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 13-May-2019