Swayne, MI, Maxted, PFL, Triaud, AHMJ, Sousa, SG, Broeg, C, Floren, H-G, Guterman, P, Simon, AE, Boisse, I, Bonfanti, A, Martin, D, Santerne, A, Salmon, S, Standing, MR, Van Grootel, V, Wilson, TG, Alibert, Y, Alonso, R, Anglada Escude, G, Asquier, J, Barczy, T, Barrado, D, Barros, SCC, Battley, M, Baumjohann, W, Beck, M, Beck, T, Bekkelien, A, Benz, W, Billot, N, Bonfils, X, Brandeker, A, Busch, M-D, Cabrera, J, Charnoz, S, Cameron, AC, Csizmadia, S, Davies, MB, Deleuil, M, Deline, A, Delrez, L, Demangeon, ODS, Demory, B-O, Dransfield, G, Ehrenreich, D, Erikson, A, Fortier, A, Fossati, L, Fridlund, M, Futyan, D, Gandolfi, D, Gillon, M, Guedel, M, Hebrard, G, Heidari, N, Hellier, C, Heng, K, Hobson, M, Hoyer, S, Isaak, KG, Kiss, L, Hodzic, VK, Lalitha, S, Laskar, J, des Etangs, AL, Lendl, M, Lovis, C, Magrin, D, Marafatto, L, McCormac, J, Miller, N, 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, NC, Scandariato, G, Segransan, D, Smith, AMS, Steinberger, M, Steller, M, Szabo, GM, Thomas, N, Udry, S, Walter, I, Walton, NA and Willett, E (2021) The EBLM project - VIII. First results for M-dwarf mass, radius, and effective temperature measurements using CHEOPS light curves. Monthly Notices of the Royal Astronomical Society, 506 (1). 306 - 322. ISSN 0035-8711

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The accuracy of theoretical mass, radius, and effective temperature values for M-dwarf stars is an active topic of debate. Differences between observed and theoretical values have raised the possibility that current theoretical stellar structure and evolution models are inaccurate towards the low-mass end of the main sequence. To explore this issue, we use the CHEOPS satellite to obtain high-precision light curves of eclipsing binaries with low-mass stellar companions. We use these light curves combined with the spectroscopic orbit for the solar-type companion to measure the mass, radius, and effective temperature of the M-dwarf star. Here, we present the analysis of three eclipsing binaries. We use the PYCHEOPS data analysis software to fit the observed transit and eclipse events of each system. Two of our systems were also observed by the TESS satellite – we similarly analyse these light curves for comparison. We find consistent results between CHEOPS and TESS, presenting three stellar radii and two stellar effective temperature values of low-mass stellar objects. These initial results from our on-going observing programme with CHEOPS show that we can expect to have ∼24 new mass, radius, and effective temperature measurements for very low-mass stars within the next few years.

Item Type: Article
Additional Information: © 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model)
Subjects: Q Science > QB Astronomy
Q Science > QB Astronomy > QB460 Astrophysics
Q Science > QB Astronomy > QB600 Planets. Planetology
Q Science > QC Physics
Divisions: Faculty of Natural Sciences > School of Chemical and Physical Sciences
Related URLs:
Depositing User: Symplectic
Date Deposited: 09 Nov 2021 15:46
Last Modified: 09 Nov 2021 15:46
URI: https://eprints.keele.ac.uk/id/eprint/10250

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