J/A+A/703/A32 CoRoT Short period variable stars (Ferreira Lopes+, 2025)
Recovering Signals in CoRoT mission (RSCoRoT). I. Short period variable stars.
Ferreira Lopes C.E., Papageorgiou A., Canto Martins B.L., Catelan M.,
Hazarika D., Leao I.C., De Medeiros J.R., Lalounta E., Christopoulou P.E.,
Fontinele D.O., Gomes R.L.
<Astron. Astrophys. 703, A32 (2025)>
=2025A&A...703A..32F 2025A&A...703A..32F (SIMBAD/NED BibCode)
ADC_Keywords: Stars, variable ; Photometry ; Optical ; Stars, distances
Keywords: methods: data analysis - methods: statistical -
astronomical databases: miscellaneous - catalogs -
stars: variables: general
Abstract:
The space mission CoRoT (Convection, Rotation, and planetary
Transiting) still holds a wealth of high-quality, yet largely
unexplored data that can be analyzed in terms of signal-to-noise ratio
and continuous time coverage.
This work is the first in a series focused on identifying and
classifying variable stars observed by CoRoT whose light curve signals
have not yet been studied or reported in the main variable star
repositories.
We employed simulations alongside real-world data to assess the
effectiveness of the moving average method in handling instrumental
jumps and detecting short-period signals (lasting less than one day)
within time series spanning approximately 20 days. To classify the
newly identified variable stars, we used the light curves of known
variable stars as a training set. A supervised selection method was
developed, introducing a novel classifier based on features extracted
from the folded light curve using the double period.
We identified 9272 variable stars, of which 6249 are not yet listed in
the SIMBAD and VSX repositories. From our preliminary classification,
we identified various types of variable stars, including 309 β
Cephei, 3,105 δ Scuti, 599 Algol-type eclipsing binaries, 844
β Lyrae eclipsing binaries, 497 W Ursae Majoris eclipsing
binaries, 1443 η Doradus, 63 RR Lyrae, and 32 T Tauri stars. The
template-based models created serve as a new classifier for variable
stars with well-sampled light curves. This catalog introduces CoRoT
variable stars into widely used astronomical repositories.
By comparing the properties of the identified variables in the inner
and outer regions of the Milky Way, we observed notable differences in
several variable star types, likely reflecting metallicity and age
gradients. The identification of signals with periods shorter than one
day also enables us to propose new approaches for detecting
longer-period variability through automated methods, which will be
explored in forthcoming papers in this series.
Description:
This study presents the results of a search for stars with variability
periods shorter than one day, based on an extensive analysis of CoRoT
mission data. A total of 9272 variable stars were identified,
including 6249 not listed in SIMBAD or VSX, primarily classified
through comparison with previously known variable types. Among them,
we identified 309 β Cephei, 3105 δ Scuti, 599 Algol-type,
844 β Lyrae, and 497 W Ursae Majoris eclipsing binaries, as well
as 1443 γ Doradus, 63 RR Lyrae, and 32 T Tauri stars. The final
sample, compiled into the CoRoT-CVSP catalogue, was built using a
novel semi-supervised visual inspection method that achieved
approximately 90% efficiency in detecting variability signatures.
Full version of Table 1 and the model templates.
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 129 9198 Variable stars
table4.dat 1335 200 Model templates
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See also:
B/corot : CoRoT observation log (N2-4.4) (CoRoT 2016)
I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)
IV/39 : TESS Input Catalog version 8.2 (TIC v8.2) (Paegert+, 2021)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 I9 --- CoRoT CoRoT identifier
11- 15 A5 --- Run CoRoT run code (e.g. IRa01, LRc06)
17- 28 F12.8 deg RAdeg Right ascension (ICRS, J2000)
30- 40 F11.8 deg DEdeg Declination (ICRS, J2000)
42- 43 A2 --- SpType Spectral type
45- 47 A3 --- LumClass Luminosity class
49- 56 F8.6 d Per Period
58- 65 F8.3 mmag Amp Amplitude
67- 80 A14 --- Class Variability type
82- 87 A6 --- Model Model/template label
89- 94 F6.3 mag CRmag CoRoT magnitude
96-101 F6.3 mag Gmag ? Gaia G magnitude
103-108 F6.3 mag Tmag ? TESS T magnitude
110-114 I5 K Teff ? Effective temperature
116-119 F4.2 [cm/s2] logg ? Surface gravity (log10)
121-127 F7.3 kpc Dist ? Distance
129 A1 --- CA [ac] Cross-match flag (1)
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Note (1): Cross-match flag (indicating the sky zone used during the
cross-match step) as follows:
a = Galactic Anticenter region
c = Galactic Center region
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 F9.6 --- Phase Light-curve phase
11- 22 F12.6 --- MD0001 Template value MD0001
24- 35 F12.6 --- MD0002 Template value MD0002
37- 48 F12.6 --- MD0003 Template value MD0003
50- 61 F12.6 --- MD0004 Template value MD0004
63- 74 F12.6 --- MD0005 Template value MD0005
76- 87 F12.6 --- MD0006 Template value MD0006
89- 100 F12.6 --- MD0007 Template value MD0007
102- 113 F12.6 --- MD0008 Template value MD0008
115- 126 F12.6 --- MD0009 Template value MD0009
128- 139 F12.6 --- MD0010 Template value MD0010
141- 152 F12.6 --- MD0011 Template value MD0011
154- 165 F12.6 --- MD0012 Template value MD0012
167- 178 F12.6 --- MD0013 Template value MD0013
180- 191 F12.6 --- MD0014 Template value MD0014
193- 204 F12.6 --- MD0015 Template value MD0015
206- 217 F12.6 --- MD0016 Template value MD0016
219- 230 F12.6 --- MD0017 Template value MD0017
232- 243 F12.6 --- MD0018 Template value MD0018
245- 256 F12.6 --- MD0019 Template value MD0019
258- 269 F12.6 --- MD0020 Template value MD0020
271- 282 F12.6 --- MD0021 Template value MD0021
284- 295 F12.6 --- MD0022 Template value MD0022
297- 308 F12.6 --- MD0023 Template value MD0023
310- 321 F12.6 --- MD0024 Template value MD0024
323- 334 F12.6 --- MD0025 Template value MD0025
336- 347 F12.6 --- MD0026 Template value MD0026
349- 360 F12.6 --- MD0027 Template value MD0027
362- 373 F12.6 --- MD0028 Template value MD0028
375- 386 F12.6 --- MD0029 Template value MD0029
388- 399 F12.6 --- MD0030 Template value MD0030
401- 412 F12.6 --- MD0031 Template value MD0031
414- 425 F12.6 --- MD0032 Template value MD0032
427- 438 F12.6 --- MD0033 Template value MD0033
440- 451 F12.6 --- MD0034 Template value MD0034
453- 464 F12.6 --- MD0035 Template value MD0035
466- 477 F12.6 --- MD0036 Template value MD0036
479- 490 F12.6 --- MD0037 Template value MD0037
492- 503 F12.6 --- MD0038 Template value MD0038
505- 516 F12.6 --- MD0039 Template value MD0039
518- 529 F12.6 --- MD0040 Template value MD0040
531- 542 F12.6 --- MD0041 Template value MD0041
544- 555 F12.6 --- MD0042 Template value MD0042
557- 568 F12.6 --- MD0043 Template value MD0043
570- 581 F12.6 --- MD0044 Template value MD0044
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596- 607 F12.6 --- MD0046 Template value MD0046
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765- 776 F12.6 --- MD0059 Template value MD0059
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882- 893 F12.6 --- MD0068 Template value MD0068
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908- 919 F12.6 --- MD0070 Template value MD0070
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1051-1062 F12.6 --- MD0081 Template value MD0081
1064-1075 F12.6 --- MD0082 Template value MD0082
1077-1088 F12.6 --- MD0083 Template value MD0083
1090-1101 F12.6 --- MD0084 Template value MD0084
1103-1114 F12.6 --- MD0085 Template value MD0085
1116-1127 F12.6 --- MD0086 Template value MD0086
1129-1140 F12.6 --- MD0087 Template value MD0087
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1155-1166 F12.6 --- MD0089 Template value MD0089
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1194-1205 F12.6 --- MD0092 Template value MD0092
1207-1218 F12.6 --- MD0093 Template value MD0093
1220-1231 F12.6 --- MD0094 Template value MD0094
1233-1244 F12.6 --- MD0095 Template value MD0095
1246-1257 F12.6 --- MD0096 Template value MD0096
1259-1270 F12.6 --- MD0097 Template value MD0097
1272-1283 F12.6 --- MD0098 Template value MD0098
1285-1296 F12.6 --- MD0099 Template value MD0099
1298-1309 F12.6 --- MD0100 Template value MD0100
1311-1322 F12.6 --- MD0101 Template value MD0101
1324-1335 F12.6 --- MD0102 Template value MD0102
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History:
From Carlos Eduardo Ferreira Lopes, ferreiralopes1011(at)gmail.com
Acknowledgements:
C.E.F.L. and this project are supported by ANID's Millennium Science
Initiative through grants ICN12_12009 and AIM23-0001, awarded to the
Millennium Institute of Astrophysics (MAS); by ANID/FONDECYT Regular
grant 1231637; by DIUDA 88231R11; by the LSST Discovery Alliance
grant; and by GEMINI/ANID grant 32240028. D.H. acknowledges support
from ANID through doctoral fellowship grant 21232262 for pursuing a
Ph.D. M.C. acknowledges additional support from ANID's Basal project
FB210003. This study was partially funded by the Conselho Nacional de
Desenvolvimento Cientifico e Tecnologico (CNPq), the Coordenacao
de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)-Finance
Code 001, and the CAPES-Print program. D.O.F. acknowledges CAPES
graduate fellowships, and R.L.G. acknowledges a CNPq PDE fellowship.
B.L.C.M. (grant No. 305804/2022-7), I.C.L. (grant No. 313103/2022-4),
and J.R.M. (grant No. 308928/2019-9) acknowledge CNPq research
fellowships. R.L.G. acknowledges CNPq postdoctoral fellowships (Grant
Nos. 200031/2023-6 and 200744/2024-0).
References:
License: [see https://spdx.org/licenses/]
(End) Patricia Vannier CDS 29-Aug-2025