J/MNRAS/528/5703 23 low mass stars photometry (Swayne+, 2024)
The EBLM Project. XI. Mass, radius and effective temperature measurements for
23 M-dwarf companions to solar-type stars observed with CHEOPS.
Swayne M.I., Maxted P.F.L., Triaud A.H.M.J., Sousa S.G., Deline A.,
Ehrenreich D., Hoyer S., Olofsson G., Boisse I., Duck A., Gill S.,
Martin D., McCormac J., Persson C.M., Santerne A., Sebastian D.,
Standing M.R., Acuna L., Alibert Y., Alonso R., Anglada G., Barczy T.,
Barrado Navascues D., Barros S.C.C., Baumjohann W., Baycroft T.A., Beck M.,
Beck T., Benz W., Billot N., Bonfils X., Borsato L., Bourrier V.,
Brandeker A., Broeg C., Carmona A., Charnoz S., Collier Cameron A.,
Cortes-Zuleta P., Csizmadia Sz., Cubillos P.E., Davies M.B., Deleuil M.,
Delfosse X., Delrez L., Demangeon O.D.S., Demory B.-O., Dransfield G.,
Erikson A., Fortier A., Forveille T., Fossati L., Fridlund M., Gandolfi D.,
Gillon M., Guedel M., Guenther M.N., Hara N., Hebrard G., Heidari N.,
Hellier C., Helling C., Isaak K.G., Kerschbaum F., Kiefer F., Kiss L.L.,
Kunovac V., Lalitha S., Lam K.W.F., Laskar J., Lecavelier des Etangs A.,
Lendl M., Magrin D., Marafatto L., Martioli E., Miller N.J., Mordasini C.,
Moutou C., Nascimbeni V., Ottensamer R., Pagano I., Palle E., Peter G.,
Piazza D., Piotto G., Pollacco D., Queloz D., Ragazzoni R., Rando N.,
Rauer H., Ribas I., Santos N.C., Scandariato G., Segransan D., Simon A.E.,
Smith A.M.S., Southworth R., Stalport M., Szabo Gy.M., Thomas N., Udry S.,
Ulmer B., Van Grootel V., Venturini J., Walton N.A., Willett E., Wilson T.G.
<Mon. Not. R. Astron. Soc. 528, 5703-5722 (2024)>
=2024MNRAS.528.5703S 2024MNRAS.528.5703S (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, eclipsing ; Stars, M-type ; Photometry ; Optical
Keywords: techniques: photometric - techniques: spectroscopic -
binaries: eclipsing - stars: fundamental parameters - stars: low-mass
Abstract:
Observations of low-mass stars have frequently shown a disagreement
between observed stellar radii and radii predicted by theoretical
stellar structure models. This "`radius inflation" problem could have
an impact on both stellar and exoplanetary science. We present the
final results of our observation programme with the CHEOPS satellite
to obtain high-precision light curves of eclipsing binaries with low
mass stellar companions (EBLMs). Combined with the spectroscopic
orbits of the solar-type companion, we can derive the masses, radii
and effective temperatures of 23 M-dwarf stars. We use the PYCHEOPS
data analysis software to analyse their primary and secondary
occultations. For all but one target, we also perform analyses with
TESS light curves for comparison. We have assessed the impact of
starspot-induced variation on our derived parameters and account for
this in our radius and effective temperature uncertainties using
simulated light curves. We observe trends for inflation with both
metallicity and orbital separation. We also observe a strong trend in
the difference between theoretical and observational effective
temperatures with metallicity. There is no such trend with orbital
separation. These results are not consistent with the idea that
observed inflation in stellar radius combines with lower effective
temperature to preserve the luminosity predicted by low-mass stellar
models. Our EBLM systems are high- quality and homogeneous
measurements that can be used in further studies into radius
inflation.
Description:
23 EBLMs were observed with CHEOPS, a primary transit observation and
enough secondary eclipses visits to achieve S/N of >4 for each object.
Each visit used exposure times of 60s and was obtained as part of a
CHEOPS GTO programme.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
stars.dat 71 23 List of studied stars
lc/* . 23 Individual detrended CHEOPS light curve
containing transits and eclipses
list.dat 139 59 List of fits files
fits/* . 59 Individual transit or eclipse fits files
--------------------------------------------------------------------------------
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)
J/MNRAS/519/3546 : The EBLM project - IX. (Sebastian+, 2023)
Byte-by-byte Description of file: stars.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 A8 --- EBLM EBLM name (JHHMM+DD)
10- 34 A25 --- Name Star name (1SWASPJHHMMSS.ss+DDMMSS.s)
36- 37 I2 h RAh Right ascension (J2000)
39- 40 I2 min RAm Right ascension (J2000)
42- 46 F5.2 s RAs Right ascension (J2000)
48 A1 --- DE- Declination sign (J2000)
49- 50 I2 deg DEd Declination (J2000)
52- 53 I2 arcmin DEm Declination (J2000)
55- 58 F4.1 arcsec DEs Declination (J2000)
60- 71 A12 --- FileName Name of the file with detrended CHEOPS light
curves containing the transit and eclipse
in subdirectory lc
--------------------------------------------------------------------------------
Byte-by-byte Description of file: lc/*
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 18 F18.13 d Time Time of observation (JD-2450000)
20- 37 F18.16 --- Flux Detrended normalised flux
39- 60 F22.20 --- e_Flux Error on detrended normalised flux
--------------------------------------------------------------------------------
Byte-by-byte Description of file: list.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 A8 --- EBLM EBLM name (JHHMM+DD)
10- 11 I2 h RAh Right ascension (J2000)
13- 14 I2 min RAm Right ascension (J2000)
16- 20 F5.2 s RAs Right ascension (J2000)
22 A1 --- DE- Declination sign (J2000)
23- 24 I2 deg DEd Declination (J2000)
26- 27 I2 arcmin DEm Declination (J2000)
29- 32 F4.1 arcsec DEs Declination (J2000)
34- 36 I3 --- Nx Number of pixels along X-axis
38- 56 A19 "datime" Obs.date Observation date
58- 60 I3 Kibyte size Size of FITS file
62-100 A39 --- FileName Name of FITS file, in subdirectory fits
102-139 A38 --- Title Title of the FITS file
--------------------------------------------------------------------------------
Acknowledgements:
Matthew Iain Swayne, m.i.swayne(at)keele.ac.uk
References:
Triaud et al., Paper I 2013A&A...549A..18T 2013A&A...549A..18T, Cat. J/A+A/549/A18
Gomez 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, Cat. J/A+A/608/A129
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
Sebastian et al., Paper IX 2023MNRAS.519.3546S 2023MNRAS.519.3546S, Cat. J/MNRAS/519/3546
Duck et al., Paper X 2023MNRAS.521.6305D 2023MNRAS.521.6305D
(End) Patricia Vannier [CDS] 23-Dec-2023