J/MNRAS/519/3546 The EBLM project - IX. (Sebastian+, 2023)
The EBLM project. IX. Five fully convective M-dwarfs, precisely measured with
CHEOPS and TESS light curves.
Sebastian D., Swayne M.I., Maxted P.F.L., Triaud A.H.M.J., Sousa S.G.,
Olofsson G., Beck M., Billot N., Hoyer S., Gill S., Heidari N.,
Martin D.V., Persson C.M., Standing M.R., Alibert Y., Alonso R.,
Anglada G., Asquier J., Barczy T., Barrado D., Barros S.C.C.,
Battley M. P., Baumjohann W., Beck T., Benz W., Bergomi M., Boisse I.,
Bonfils X., Brandeker A., Broeg C., Cabrera J., Charnoz S.,
Collier Cameron A., Csizmadia Sz., Davies M. B., Deleuil M., Delrez L.,
Demangeon O.D.S., Demory O.-B., Dransfield, G., Ehrenreich D., Erikson A.,
Fortier A., Fossati L., Fridlund M., Gandolfi D., Gillon M., Guedel M.,
Hasiba J., Hebrard G., Heng K., Isaak K.G., Kiss L.L., Kopp E.,
Kunovac V., Laskar J., Lecavelier des Etangs A., Lendl M., Lovis C.,
Magrin D., McCormac J., Miller N. J., Nascimbeni V., Ottensamer R.,
Pagano I., Palle E., Pepe F.A., Peter G., Piotto G., Pollacco, D.,
Queloz D., Ragazzoni R., Rando N., Rauer H., Ribas I., Lalitha, S.,
Santerne A., Santos N.C., Scandariato G., Segransan D., Simon A.E.,
Smith A.M.S., Steller M., Szabo Gy.M., Thomas N., Udry S.,
Van Grootel V., Walton N. A.
<Mon. Not. R. Astron. Soc. 519, 3546 (2023)>
=2023MNRAS.519.3546S 2023MNRAS.519.3546S (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, eclipsing ; Stars, M-type ; Photometry ; Optical
Keywords: binaries: eclipsing - stars: fundamental parameters -
stars: low-mass - techniques: photometric - techniques: spectroscopic
Abstract:
Eclipsing binaries are important benchmark objects to test and
calibrate stellar structure and evolution models. This is especially
true for binaries with a fully convective M-dwarf component for which
direct measurements of these stars' masses and radii are difficult
using other techniques. Within the potential of M-dwarfs to be
exoplanet host stars, the accuracy of theoretical predictions of their
radius and effective temperature as a function of their mass is an
active topic of discussion. Not only the parameters of transiting
exoplanets but also the success of future atmospheric characterisation
rely on accurate theoretical predictions. We present the analysis of
five eclipsing binaries with low-mass stellar companions out of a
sub-sample of 23, for which we obtained ultra high-precision light
curves using the CHEOPS satellite. The observation of their primary
and secondary eclipses are combined with spectroscopic measurements to
precisely model the primary parameters and derive the M-dwarfs mass,
radius, surface gravity, and effective temperature estimates using the
PYCHEOPS data analysis software. Combining these results to the same
set of parameters derived from TESS light curves, we find very good
agreement (better than 1% for radius and better than 0.2% for surface
gravity). We also analyse the importance of precise orbits from radial
velocity measurements and find them to be crucial to derive M-dwarf
radii in a regime below 5% accuracy. These results add five valuable
data points to the mass-radius diagram of fully-convective M-dwarfs.
Description:
Two to four visits each of five EBLMs were obtained with CHEOPS to
observe the primary transit and secondary eclipse events for each
object. Each visit used exposure times of 60s and was obtained as part
of a CHEOPS GTO programme.
Objects:
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RA (2000) DE Designation(s)
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02 39 29.3 -20 02 24 EBLM J0239-20 = TYC 5862-1683-1
05 40 43.6 -17 32 45 EBLM J0540-17 = TYC 5921-745-1
05 46 04.8 -18 17 55 EBLM J0546-18 = TIC 93334206
07 19 14.3 +25 25 31 EBLM J0719+25 = TYC 1913-0843-1
23 59 29.7 +44 40 31 EBLM J2359+44 = TYC 3245-0077-1
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
j0239_01.dat 103 420 EBLM J0239-20 data from CHPR100037TG012001_V0200
j0239_02.dat 103 396 EBLM J0239-20 data from CHPR100037TG011901_V0200
j0239_03.dat 103 344 EBLM J0239-20 data from CHPR100037TG011902_V0200
j0540_01.dat 103 385 EBLM J0540-17 data from CHPR100037TG012501_V0200
j0540_02.dat 103 372 EBLM J0540-17 data from CHPR100037TG012601_V0200
j0540_03.dat 103 315 EBLM J0540-17 data from CHPR100037TG012502_V0200
j0540_04.dat 103 287 EBLM J0540-17 data from CHPR100037TG012503_V0200
j0546_01.dat 103 259 EBLM J0546-18 data from CHPR100037TG012801_V0200
j0546_02.dat 103 335 EBLM J0546-18 data from CHPR100037TG012701_V0200
j0546_03.dat 103 244 EBLM J0546-18 data from CHPR100037TG012702_V0200
j0719_01.dat 103 272 EBLM J0719+25 data from CHPR100037TG013001_V0200
j0719_02.dat 103 295 EBLM J0719+25 data from CHPR100037TG012901_V0200
j0719_03.dat 103 298 EBLM J0719+25 data from CHPR100037TG017301_V0200
j2359_01.dat 103 302 EBLM J2359+44 data from CHPR100037TG016301_V0200
j2359_02.dat 103 467 EBLM J2359+44 data from CHPR100037TG016401_V0200
list.dat 131 15 List of fits files
fits/* . 15 Individual fits files
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See also:
J/A+A/549/A18 : WASP-30 and J1219-39 light + velocity curves (Triaud+, 2013)
J/A+A/572/A50 : J0113+31 light + velocity curves (Gomez Maqueo Chew+, 2014)
J/A+A/604/L6 : EBLM J0555-57 photometry and RV (von Boetticher+, 2017)
J/A+A/625/A150 : 10 very-low-mass stars photometry (von Boetticher+, 2019)
J/A+A/626/A119 : EBLM J2349-32 photometry, RV and spectra (Gill+, 2019)
Byte-by-byte Description of file: j*.dat
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Bytes Format Units Label Explanations
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1- 14 F14.6 d Time Time of mid-exposure
16- 23 F8.6 --- Flux Normalized flux
25- 32 F8.6 --- e_Flux Normalized flux error
34- 41 F8.6 --- Fluxd Normalized flux corrected for
instrumental trends
43- 49 F7.4 pix Xoff Target position offset in X-direction
51- 57 F7.4 pix Yoff Target position offset in Y-direction
59- 66 F8.4 deg Roll Spacecraft roll angle
68- 76 E9.3 --- Contam Fraction of flux in aperture from
nearby stars
78- 85 E8.3 --- Smear Fraction of flux in aperture from
readout trails
87- 95 F9.7 --- Bg Fraction of flux in aperture from background
97-103 F7.3 --- Temp2 thermFront_2 temperature sensor reading
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh Right Ascension of center (J2000)
4- 5 I2 min RAm Right Ascension of center (J2000)
7- 10 F4.1 s RAs Right Ascension of center (J2000)
12 A1 --- DE- Declination sign of center (J2000)
14- 15 I2 deg DEd Declination of center (J2000)
17- 18 I2 arcmin DEm Declination of center (J2000)
20- 21 I2 arcsec DEs Declination of center (J2000)
23- 38 A16 "datime" Obs.Date Observation Date
40- 41 I2 Kibyte size Size of FITS file
43- 81 A39 --- FileName Name of FITS file, in subdirectory fits
83-131 A49 --- Title Title of the FITS file
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Acknowledgements:
Daniel Sebastian, D.Sebastian.1(at)bham.ac.uk
References:
Triaud et al., Paper I 2013A&A...549A..18T 2013A&A...549A..18T, Cat. J/A+A/549/A18
Omez Maqueo Chew et al., Paper II 2014A&A...572A..50G 2014A&A...572A..50G, Cat. J/A+A/572/A50
von Boetticher et al., Paper III 2017A&A...604L...6V 2017A&A...604L...6V, Cat. J/A+A/604/L6
Triaud et al., Paper IV 2017A&A...608A.129T 2017A&A...608A.129T
von Boetticher et al., Paper V 2019A&A...625A.150V 2019A&A...625A.150V, Cat. J/A+A/625/A150
Gill et al., Paper VI 2019A&A...626A.119G 2019A&A...626A.119G, Cat. J/A+A/626/A119
Kunovac Hodzic et al., Paper VII 2020MNRAS.497.1627K 2020MNRAS.497.1627K
Swayne et al., Paper VIII 2021MNRAS.506..306S 2021MNRAS.506..306S
Duck et al., Paper X 2023MNRAS.521.6305D 2023MNRAS.521.6305D
(End) Patricia Vannier [CDS] 18-May-2023