Fundamental effective temperature measurements for eclipsing binary stars — III. SPIRou near-infrared spectroscopy and CHEOPS photometry of the benchmark G0V star EBLM J0113+31. (arXiv:2205.01466v2 [astro-ph.SR] UPDATED)

Fundamental effective temperature measurements for eclipsing binary stars — III. SPIRou near-infrared spectroscopy and CHEOPS photometry of the benchmark G0V star EBLM J0113+31. (arXiv:2205.01466v2 [astro-ph.SR] UPDATED)
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EBLM J0113+31 is moderately bright (V=10.1), metal-poor ([Fe/H]$approx-0.3$)
G0V star with a much fainter M dwarf companion on a wide, eccentric orbit
(=14.3 d). 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: $M_1 = 1.029 pm
0.025 M_{odot}$, $M_2 = 0.197 pm 0.003 M_{odot}$, $R_1 = 1.417 pm 0.014
R_{odot}$, $R_2 = 0.215 pm 0.002 R_{odot}$. Using $R_1$ and the parallax
from Gaia EDR3 we find that this star’s angular diameter is $theta = 0.0745
pm 0.0007$ mas. The apparent bolometric flux of the G0V star corrected for
both extinction and the contribution from the M dwarf ($<0.2$ per cent) is
${mathcal F}_{oplus,0} = (2.62pm 0.05)times10^{-9}$ erg.cm$^{-2}$.s$^{-1}$.
Hence, this G0V star has an effective temperature $T_{rm eff,1} = 6124{rm,K}
pm 40{rm ,K,(rnd.)} pm 10 {rm ,K,(sys.)}$. 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.

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