J/MNRAS/513/6042 EBLM J0113+31 CHEOPS light curves (Maxted+, 2022)
Fundamental effective temperature measurements for eclipsing binary stars.
III. SPIRou near-infrared spectroscopy and CHEOPS photometry of the benchmark
G0V star EBLM J0113+31.
Maxted P.F.L., Miller N.J., Hoyer S., Adibekyan V., Sousa S.G., Billot N.,
Fortier A., Simon A.E., Collier Cameron A., Swayne M.I., Gutermann P.,
Triaud A.H.M.J., Southworth J., Alibert Y., Alonso R., Anglada G.,
Barczy T., Barrado Navascues D., Barros S.C.C., Baumjohann W., Beck M.,
Beck T., Benz W., Bonfils X., Brandeker A., Broeg C., Buder M., Cabrera J.,
Charnoz S., Corral Van Damme C., Csizmadia S., Davies M.B., Deleuil M.,
Delrez L., Demangeon O., Demory B.-O., Ehrenreich D., Erikson A.,
Fossati L., Fridlund M., Gandolfi D., Gillon M., Gudel M., Heng K.,
Hernandez Leon J.E., Isaak K.G., Kiss L.L., Laskar J.,
Lecavelier Des Etangs A., Lendl M., Lovis C., Magrin D., Munari M.,
Nascimbeni V., Olofsson G., Ottensamer R., Pagano I., Palle E., Peter G.,
Piotto G., Pollacco D., Queloz D., Ragazzoni R., Rando N., Rauer H.,
Ribas I., Santos N.C., Scandariato G., Segransan D., Smith A.M.S.,
Steinberger M., Steller M., Szabo G.M., Thomas N., Udry S., Van Grootel V.,
Walton N.
<Mon. Not. R. Astron. Soc., 513, 6042-6057 (2022)>
=2022MNRAS.513.6042M 2022MNRAS.513.6042M (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, eclipsing ; Photometry ; Optical
Keywords: techniques: spectroscopic - binaries: eclipsing -
stars: fundamental parameters - stars: solar-type
Abstract:
EBLM J0113+31 is a moderately bright (V=10.1), metal-poor
([Fe/H]~-0.3) G0V star with a much fainter M dwarf companion on a
wide, eccentric orbit (=14.3d). We have used near-infrared
spectroscopy obtained with the SPIRou spectrograph to measure the
semi-amplitude of the M dwarf's spectroscopic orbit, and
high-precision photometry of the eclipse and transit from the CHEOPS
and TESS space missions to measure the geometry of this binary system.
From the combined analysis of these data together with previously
published observations, we obtain the following model-independent
masses and radii: M1=1.029±0.025M☉,
M2=0.197±0.003M☉, R1=1.417±0.014R☉,
R2=0.215±0.002R☉. Using R1 and the parallax from Gaia EDR3
we find that this star's angular diameter is
θ=0.0745±0.0007mas. The apparent bolometric flux of the G0V
star corrected for both extinction and the contribution from the M
dwarf (<0.2 per cent) is F⊕=(2.62±0.05)x10-9erg/cm2/s.
Hence, this G0V star has an effective temperature Teff,1=6124K±40K
(rnd.) ±10K(sys.). EBLM J0113+31 is an ideal benchmark star that can
be used for 'end-to-end' tests of the stellar parameters measured by
large-scale spectroscopic surveys, or stellar parameters derived from
asteroseismology with PLATO. The techniques developed here can be
applied to many other eclipsing binaries in order to create a network
of such benchmark stars.
Description:
CHEOPS photometry of EBLM_J0113+31 generated using pycheops version
1.0.16.
Objects:
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RA (2000) DE Designation(s)
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01 13 51.3 +31 49 10 EBLM J0113+31 = TIC 400048097
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
lc01.dat 108 379 Data from archive file CHPR100037TG011601_V0200
lc02.dat 108 298 Data from archive file CHPR100037TG017201_V0200
lc03.dat 108 445 Data from archive file CHPR100037TG017101_V0200
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Byte-by-byte Description of file: lc01.dat lc02.dat lc03.dat
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Bytes Format Units Label Explanations
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3- 16 F14.6 d Time Time of mid-exposure (JD)
18- 25 F8.6 --- Flux Normalized flux
27- 34 F8.6 --- e_Flux Normalized flux error
36- 43 F8.6 --- Fluxd Normalized flux corrected for instrumental trends
45- 52 F8.4 pix xoff Target position offset in x-direction
54- 61 F8.4 pix yoff Target position offset in y-direction
63- 70 F8.4 deg roll Spacecraft roll angle
72- 80 F9.7 --- contam Fraction of flux in aperture from nearby stars
82- 90 F9.7 --- smear Fraction of flux in aperture from readout trails
92-100 F9.7 --- bg Fraction of flux in aperture from background
102-108 F7.3 --- Temp2 thermFront_2 temperature sensor reading
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Acknowledgements:
Pierre Maxted, p.maxted(at)keele.ac.uk
References:
Miller et al., Paper I 2020MNRAS.497.2899M 2020MNRAS.497.2899M
Miller et al., Paper II 2022MNRAS.517.5129M 2022MNRAS.517.5129M
(End) Patricia Vannier [CDS] 30-Jan-2023