J/MNRAS/511/4285 YOUNGSTER EA/EB young stars catalog (Battley+, 2022)
YOUNG Star detrending for Transiting Exoplanet Recovery (YOUNGSTER) - II.
Using self-organizing maps to explore young star variability in sectors 1-13
of TESS data.
Battley M.P., Armstrong D.J., Pollacco D.
<Mon. Not. R. Astron. Soc. 511, 4285-4304 (2022)>
=2022MNRAS.511.4285B 2022MNRAS.511.4285B (SIMBAD/NED BibCode)
ADC_Keywords: Exoplanets ; Stars, variable ; Transient ; Combined data ;
Associations, stellar ; Binaries, eclipsing ; Photometry ;
Optical ; Infrared ; Binaries, orbits ; Photometry, classification
Keywords: methods: observational - techniques: photometric -
planets and satellites: general - stars: activity - stars: rotation
Abstract:
Young exoplanets and their corresponding host stars are fascinating
laboratories for constraining the time-scale of planetary evolution
and planet-star interactions. However, because young stars are
typically much more active than the older population, in order to
discover more young exoplanets, greater knowledge of the wide array of
young star variability is needed. Here Kohonen self-organizing maps
(SOMs) are used to explore young star variability present in the first
year of observations from the Transiting Exoplanet Survey Satellite
(TESS), with such knowledge valuable to perform targeted detrending of
young stars in the future. This technique was found to be particularly
effective at separating the signals of young eclipsing binaries and
potential transiting objects from stellar variability, a list of which
are provided in this paper. The effect of pre-training the SOMs on
known variability classes was tested, but found to be challenging
without a significant training set from TESS. SOMs were also found to
provide an intuitive and informative overview of leftover systematics
in the TESS data, providing an important new way to characterize
troublesome systematics in photometric data sets. This paper
represents the first stage of the wider YOUNGSTER program, which will
use a machine-learning- based approach to classification and targeted
detrending of young stars in order to improve the recovery of smaller
young exoplanets.
Description:
In this work, light curves extracted from the Cluster Difference
Imaging Photometric Survey (CDIPS) pipeline (Bouma et al.
2019ApJS..245...13B 2019ApJS..245...13B, Cat. J/ApJS/245/13; Bhatti et al.
2019zndo...3370324B) were chosen as the primary data source due to
their dedicated young-star extraction approach and the availability of
a large number of light curves for the entire first year of TESS's
Primary Mission (Sectors 1-13).
The CDIPS target list was constructed from four large archival
catalogues of open clusters (Kharchenko et al. 2013A&A...558A..53K 2013A&A...558A..53K,
Cat. J/A+A/558/A53; Dias et al. 2014A&A...564A..79D 2014A&A...564A..79D, Cat. J/A+A/564/A79;
Cantat-Gaudin et al. 2018A&A...618A..93C 2018A&A...618A..93C, Cat. J/A+A/618/A93;
Gaia Collaboration 2018A&A...616A..10G 2018A&A...616A..10G, Cat. J/A+A/616/A10;
2018A&A...616A...1G 2018A&A...616A...1G, Cat. I/345) as well as nine
smaller catalogues of moving groups and stellar associations (Rizzuto
et al. 2011MNRAS.416.3108R 2011MNRAS.416.3108R, Cat. J/MNRAS/416/3108; Roser et al.
2011A&A...531A..92R 2011A&A...531A..92R, Cat. J/A+A/531/A92; Kraus et al.
2014AJ....147..146K 2014AJ....147..146K, Cat. J/AJ/147/146; Bell et al.
2017MNRAS.468.1198B 2017MNRAS.468.1198B; Oh et al. 2017AJ....153..257O 2017AJ....153..257O, Cat. J/AJ/153/257;
Gagne & Faherty 2018ApJ...862..138G 2018ApJ...862..138G, Cat. J/ApJ/862/138; Gagne et al.
2018ApJ...856...23G 2018ApJ...856...23G, Cat. J/ApJ/856/23; 2018ApJ...860...43G 2018ApJ...860...43G,
Cat. J/ApJ/860/43; Zari et al. 2019A&A...628A.123Z 2019A&A...628A.123Z). This resulted in
an overall target list of 1061447 stars, for which 671894 light curves
are available over the first year of TESS observations.
As explained in the section 5 Results, the SOM method appears to be
very effective at highlighting and separating the distinctive shapes
of eclipsing binaries from other variability present in the young star
light-curves. All selected light-curves were then checked by eye in
order to catch any remaining obvious false positives. Such false
positives typically consisted of excess noise, sharp stellar activity
or obvious blends with other nearby targets. Following this step and a
uniqueness cut on TIC ID, 8103 EA and 1297 EB candidate systems
remained, all of which are presented in table2.dat.
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 65 9400 Candidate eclipsing binary signals found in
Year 1 of the CDIPS TESS light-curves
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See also:
J/MNRAS/495/4924 : Exoplanets in Southern open clusters (Nardiello+, 2020)
J/MNRAS/490/3806 : Exoplanets & variable stars in 47 Tuc field
(Nardiello+, 2019)
J/AJ/160/239 : Cluster difference imaging photometric survey. II.
(Bouma+, 2020)
J/ApJS/245/13 : CDIPS. I. LCs from TESS sectors 6 and 7 (Bouma+, 2019)
J/AJ/161/171 : THYME. V. Discovering a new stellar association
(Tofflemire+, 2021)
J/AJ/161/65 : THYME. IV. 3 Exoplanets around TOI-451 B (Newton+, 2021)
J/AJ/154/224 : Transiting planets in young clusters from K2 (Rizzuto+,2017)
J/AJ/157/85 : The CIDA Variability Survey of Orion OB1. II.
(Briceno+, 2019)
J/MNRAS/496/1197 : Young exoplanets in TESS sectors 1-5 (Battley+, 2020)
J/MNRAS/498/5972 : Variables and dippers in young associations (Nardiello,2020)
J/A+A/541/A77 : Kohonen-selected unusual SDSS quasars (Meusinger+, 2012)
J/MNRAS/456/2260 : K2 Variability Catalogue II (Armstrong+, 2016)
J/A+A/625/L13 : TESS light curve of beta Pictoris (Zieba+, 2019)
J/ApJS/203/32 : Machine-learned ASAS Classification Cat. (MACC)
(Richards+, 2012)
J/A+A/564/A79 : Proper motions of open clusters from UCAC4 (Dias+, 2014)
J/A+A/618/A93 : Gaia DR2 open clusters in the Milky Way
(Cantat-Gaudin+, 2018)
J/A+A/616/A10 : 46 open clusters GaiaDR2 HR diagrams
(Gaia Collaboration, 2018)
J/MNRAS/416/3108 : Membership of Sco OB2 moving group (Rizzuto+, 2011)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
IV/39 : TESS Input Catalog version 8.2 (TIC v8.2) (Paegert+, 2021)
IV/34 : K2 Ecliptic Plane Input Catalog (EPIC) (Huber+, 2017)
II/347 : KiDS-ESO-DR3 multi-band source catalog (de Jong+, 2017)
J/AJ/147/146 : Spectroscopy of Tuc-Hor candidate members (Kraus+, 2014)
J/A+A/531/A92 : Deep all-sky census of the Hyades (Roeser+, 2011)
J/AJ/153/257 : Comoving stars in Gaia DR1 (Oh+, 2017)
J/ApJ/862/138 : BANYAN. XIII. Nearby young assoc. with Gaia DR2
(Gagne+, 2018)
J/ApJ/860/43 : BANYAN. XII. New members from Gaia-Tycho data (Gagne+, 2018)
J/ApJ/856/23 : BANYAN. XI. The BANYAN Σ algorithm (Gagne+, 2018)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 19 I19 --- GaiaDR2 Gaia DR2 source identifier number (GaiaDR2ID)
21- 30 I10 --- TIC TESS identifier number (TICID)
32- 55 E24.19 d Period ? Orbiting period of the binary signals
(Period)
57- 62 A6 --- Flag Light curves with only single eclipses are
labelled as Single in the Period
64- 65 A2 --- Type [EA/EB] Binary stars types, 8103 EA and
1297 EB candidate systems in our sample (Type)
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History:
From electronic version of the journal
References:
Battley et al., Paper I 2020MNRAS.496.1197B 2020MNRAS.496.1197B, cat. J/MNRAS/496/1197
(End) Luc Trabelsi [CDS] 29-Jan-2025