Fundamental effective temperature measurements for eclipsing binary stars – III. SPIRou near-infrared spectroscopy and CHEOPS photometry of the benchmark G0V star EBLM J0113+31
Date
01/07/2022Author
Funder
Grant ID
ST/R00824/1
ST/R003203/1
ST/V000861/1
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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 (=14.3 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: 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 ± 0.0007 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 F⊕,0=(2.62±0.05)×10−9 erg cm−2 s−1. Hence, this G0V star has an effective temperature Teff, 1 = 6124 K ± 40 K (rnd.) ± 10 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.
Citation
Maxted , P F L , Miller , N J , Hoyer , S , Adibekyan , V , Sousa , S G , Billot , N , Fortier , A , Simon , A E , Cameron , A C , Swayne , M I , Gutermann , P , Triaud , A H M J , Southworth , J , Alibert , Y , Alonso , R , Anglada , G , Bárczy , T , Navascues , D B Y , Barros , S C C , Baumjohann , W , Beck , M , Beck , T , Benz , W , Bonfils , X , Brandeker , A , Broeg , C , Buder , M , Cabrera , J , Charnoz , S , Van Damme , C 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 , Güdel , M , Heng , K , Leon , J E H , Isaak , K G , Kiss , L L , Laskar , J , Etangs , A L D , Lendl , M , Lovis , C , Magrin , D , Munari , M , Nascimbeni , V , Olofsson , G , Ottensamer , R , Pagano , I , Pallé , E , Peter , G , Piotto , G , Pollacco , D , Queloz , D , Ragazzoni , R , Rando , N , Rauer , H , Ribas , I , Santos , N C , Scandariato , G , Ségransan , D , Smith , A M S , Steinberger , M , Steller , M , Szabó , G M , Thomas , N , Udry , S , Van Grootel , V & Walton , N 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 ' , Monthly Notices of the Royal Astronomical Society , vol. 513 , no. 4 , stac1270 , pp. 6042–6057 . https://doi.org/10.1093/mnras/stac1270
Publication
Monthly Notices of the Royal Astronomical Society
Status
Peer reviewed
ISSN
0035-8711Type
Journal article
Description
Funding: ACC acknowledges support from STFC consolidated grant numbers ST/R000824/1 and ST/V000861/1, and UKSA grant number ST/R003203/1.Collections
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