Fundamental effective temperature measurements for eclipsing binary stars-III. SPIRou near-infrared spectroscopy and CHEOPS photometry of the benchmark G0V star EBLM J0113+31

Author(s)

P. F.L. Maxted, N. J. Miller, S. Hoyer, V. Adibekyan, S. G. Sousa, N. Billot, A. Fortier, A. E. Simon, A. Collier Cameron, M. I. Swayne, P. Gutermann, A. H.M.J. Triaud, J. Southworth, Y. Alibert, R. Alonso, G. Anglada, T. Bárczy, D. Barrado Navascues, S. C.C. Barros, W. Baumjohann, M. Beck, T. Beck, W. Benz, X. Bonfils, A. Brandeker, C. Broeg, M. Buder, J. Cabrera, S. Charnoz, C. Corral Van Damme, Sz Csizmadia, M. B. Davies, M. Deleuil, L. Delrez, O. Demangeon, B. O. Demory, D. Ehrenreich, A. Erikson, L. Fossati, M. Fridlund, D. Gandolfi, M. Gillon, M. Güdel, K. Heng, J. E. Hernández Leon, K. G. Isaak, L. L. Kiss, J. Laskar, A. Lecavelier Des Etangs, M. Lendl, C. Lovis, D. D. Magrin, M. Munari, V. Nascimbeni, G. Olofsson, R. Ottensamer, I. Pagano, E. Palle, G. Peter, G. Piotto, D. Pollacco, D. Queloz, R. Ragazzoni, N. Rando, H. Rauer, I. Ribas, N. C. Santos, G. Scandariato, D. Segransan, A. M.S. Smith, M. Steinberger, M. Steller, Gy M. Szabó, N. Thomas, S. Udry, V. Van Grootel, N. Walton

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 (= 14.3 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 ± 0.025 M⊙, M2 = 0.197 ± 0.003 M⊙, R1 = 1.417 ± 0.014 R⊙, R2 = 0.215 ± 0.002 R⊙. 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.

Organisation(s)

Department of Astrophysics

External organisation(s)

Keele University, Eötvös Loránd University Budapest, Aix-Marseille Université, Universidade do Porto, Université de Genève, Universität Bern, University of St. Andrews, National Institute for Earth Sciences & Astronomy (INSU-CNRS), University of Birmingham, Institute of Astrophysics of the Canary Islands, University of La Laguna, Spanish National Research Council (CSIC), Institute of Space Studies of Catalonia (IEEC), Admatis Ltd., European Space Astronomy Centre (ESA), Österreichische Akademie der Wissenschaften (ÖAW), Laboratoire d'Écologie Alpine, Stockholm University, Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR), Université Paris VII - Paris-Diderot, Science and Operations Department - Science Division (SCI-SC), Lund University, Université de Liège, Leiden University, Chalmers University of Technology, University of Turin, University of Warwick, Airbus Defence and Space, Eötvös Loránd Research Network, Université de recherche Paris Sciences et Lettres, Université Paris VI - Pierre-et-Marie-Curie, Osservatorio Astronomico, INAF-Osservatorio Astrofisico di Catania, University of Padova, Eidgenössische Technische Hochschule Zürich, University of Cambridge, Technische Universität Berlin, Freie Universität Berlin (FU)

Journal

Monthly Notices of the Royal Astronomical Society

Volume

513

Pages

6042-6057

No. of pages

16

ISSN

0035-8711

DOI

https://doi.org/10.1093/mnras/stac1270

Publication date

07-2022

Peer reviewed

Yes

Austrian Fields of Science 2012

103003 Astronomy, 103004 Astrophysics, 103038 Space exploration

Keywords

ASJC Scopus subject areas

Astronomy and Astrophysics, Space and Planetary Science

Portal url

https://ucrisportal.univie.ac.at/en/publications/5c26e912-4670-4fe1-be13-72b0ce2a175f