J/ApJS/240/17 Exoplanets in the Antarctic sky. II. 116 candidates (Zhang+, 2019)
Exoplanets in the Antarctic sky.
II. 116 transiting exoplanet candidates found by AST3-II (CHESPA) 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, 17 (2019)>
=2019ApJS..240...17Z 2019ApJS..240...17Z
ADC_Keywords: Exoplanets; Photometry, SDSS; Surveys; Stars, double and multiple;
Stars, diameters
Keywords: binaries: eclipsing ; catalogs ; planets and satellites: detection ;
stars: variables: general ; surveys ; techniques: photometric
Abstract:
We report first results from the CHinese Exoplanet Searching Program
from Antarctica (CHESPA)--a wide-field high-resolution photometric
survey for transiting exoplanets carried out using telescopes of the
AST3 (Antarctic Survey Telescopes times 3) project. There are now
three telescopes (AST3-I, AST3-II, and CSTAR-II) operating at Dome A
--the highest point on the Antarctic Plateau-- in a fully automatic
and remote mode to exploit the superb observing conditions of the
site, and its long and uninterrupted polar nights. The search for
transiting exoplanets is one of the key projects for AST3. During the
austral winters of 2016 and 2017 we used the AST3-II telescope to
survey a set of target fields near the southern ecliptic pole, falling
within the continuous viewing zone of the TESS mission. The first data
release of the 2016 data, including images, catalogs, and light curves
of 26578 bright stars (7.5≤mi≤15), was presented in Zhang+ (2018,
J/ApJS/240/16). The best precision, as measured by the rms of the
light curves at the optimum magnitude of the survey (mi=10), is
around 2mmag. We detect 222 objects with plausible transit signals
from these data, 116 of which are plausible transiting exoplanet
candidates according to their stellar properties as given by the TESS
Input Catalog, Gaia DR2, and TESS-HERMES spectroscopy. With the first
data release from TESS expected in late 2018, this candidate list will
be timely for improving the rejection of potential false-positives.
Description:
The CHinese Exoplanet Searching Program from Antarctica (CHESPA)
--described in Paper I; Zhang+, 2018, J/ApJS/240/16 -- has been
running since 2012 using the CSTAR and AST3 (Antarctic Survey
Telescopes times 3) telescopes.
To maximize collaboration with TESS and enhance the scientific
importance of our searching program, we selected 48 target fields
close to the South Ecliptic Pole (RAJ2000=06:00:00,DEJ2000=-66:33:00)
and within the TESS' Southern continuous viewing zone (CVZ).
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 92 222 Fitted parameters of exoplanet candidates
from AST3-II observations in 2016
table3.dat 110 222 Stellar properties of exoplanet candidates
from AST3-II observations in 2016
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See also:
II/278 : Transits observed in OGLE 2001-2003 (Udalski+, 2002-2004)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
J/MNRAS/372/1117 : SuperWASP exoplanetary transit survey (Christian+, 2006)
J/MNRAS/381/851 : SuperWASP-North extrasolar planet cand. (Clarkson+, 2007)
J/MNRAS/379/647 : SuperWASP-North extrasolar planet candidates (Lister+, 2007)
J/MNRAS/379/816 : SuperWASP-North extrasolar planet candidates (Street+, 2007)
J/MNRAS/384/1097 : SuperWASP-North extrasolar planet candidates (Kane+, 2008)
J/PASP/122/347 : Chinese Small Telescope ARray (CSTAR) (Zhou+, 2010)
J/AJ/142/155 : Variable stars photometry from Dome A (Wang+, 2011)
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/ApJS/240/16 : Exoplanets in Antarctic sky. I. AST3-II DR1 (Zhang+, 2019)
http://www.physics.usyd.edu.au/tess-hermes/ : TESS-HERMES home page
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
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 [7.5/15.4] APASS/Sloan i-band AB magnitude
30- 40 F11.6 d Epoch [1477.6/1530.3] Epoch; JD-2456000
42- 47 F6.4 d Per [0.2/6] Observed period of transit signal
49- 53 F5.3 mag dmag [0.002/0.07] Transit depth in Sloan i-band magnitude
55- 59 F5.3 h Tdur [0.3/6.3] Observed transit duration
61- 64 F4.1 --- SRN [5/22.1] Signal-to-Red-Noise-Ratio of the
transit event
66- 70 F5.3 --- Rp/R* [0.03/0.3] Ratio, planet fitted radius to host star
radius (1)
72- 77 F6.3 --- a/R* [1.5/27.6] Ratio, planet fitted semi-major axis
to host star radius
79- 83 F5.2 deg Inc [86.9/93.1] Fitted inclination
85- 88 F4.2 --- eta [0.4/1.8] Ratio, observed transit duration to
the theoretical duration: η=Tdur/Ttheory
90- 92 A3 --- Label Label(s) (G1)
--------------------------------------------------------------------------------
Note (1): The fit is based the model given
by Mandel & Agol (2002ApJ...580L.171M 2002ApJ...580L.171M).
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 F8.4 deg RAdeg Target right ascension (J2000)
9- 16 F8.4 deg DEdeg Target declination (J2000)
18- 26 I9 --- TIC [41087772/453098052]? TESS Input Catalog ID (1)
28- 28 I1 --- Flag [0/1] CTL flag (1= also present in the Candidate
Target List of TESS) (1)
30- 48 I19 --- Gaia ? Gaia DR2 identifier (2)
50- 54 F5.2 mag imag [7.5/15.4] APASS/Sloan i-band AB magnitude
56- 60 F5.2 mag Tmag [6.5/14]? TESS magnitude (1)
62- 66 F5.2 mag rpmag [6.5/14.1]? Gaia RP magnitude (2)
68- 72 F5.2 Rsun R*tic [0.1/23.1]? Stellar radii, TESS input catalog (1)
74- 79 F6.2 Rsun R*gaia [0.5/105]? Stellar radius, Gaia DR2 (2)
81- 86 F6.2 Rsun R*her [0.4/100.5]? Stellar radius, TESS-HERMES survey (3)
88- 93 F6.4 Msun M*tic [0.1/2.4]? Stellar mass, TESS Input Catalog (1)
95-100 F6.4 d Per [0.2/6] Observed period of transit signal
102-106 F5.3 --- Rp/R* [0.03/0.3] Ratio, planet radius to host star radius
108-110 A3 --- Label Label(s) (G1)
--------------------------------------------------------------------------------
Note (1): TESS Input Catalog (TIC): Stassun+, 2018, J/AJ/156/102
Note (2): Gaia DR2: Gaia Collaboration, 2018, I/345 ;
≪Gaia DR2 NNNNNNNNNNNNNNNNNNN> in Simbad.
Note (3): TESS-HERMES survey: Sharma+ 2018MNRAS.473.2004S 2018MNRAS.473.2004S
--------------------------------------------------------------------------------
Global notes:
Note (G1): Labels from AST3-II observation as follows:
TC = Transit Candidate (72 occurrences);
TC? = Transit Candidate but needs further inspection (44 occurrences);
LB = Low-depth Binary (106 occurrences).
--------------------------------------------------------------------------------
Nomenclature Notes:
Sources are named <[ZYL2019] AST3II JDDD.dddd+DD.dddd> in Simbad.
History:
From electronic version of the journal
References:
Zhang et al. Paper I. 2019ApJS..240...16Z 2019ApJS..240...16Z Cat. J/ApJS/240/16
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 14-May-2019