The EBLM project - IX. Five fully convective M-dwarfs, precisely measured with CHEOPS and TESS light curves

Autor(en)

D. Sebastian, M. I. Swayne, P. F.L. Maxted, A. H.M.J. Triaud, S. G. Sousa, G. Olofsson, M. Beck, N. Billot, S. Hoyer, S. Gill, N. Heidari, D. V. Martin, C. M. Persson, M. R. Standing, Y. Alibert, R. Alonso, G. Anglada, J. Asquier, T. Bárczy, D. Barrado, S. C.C. Barros, M. P. Battley, W. Baumjohann, T. Beck, W. Benz, M. Bergomi, I. Boisse, X. Bonfils, A. Brandeker, C. Broeg, J. Cabrera, S. Charnoz, A. Collier Cameron, S. Csizmadia, M. B. Davies, M. Deleuil, L. Delrez, O. D.S. Demangeon, B. O. Demory, G. Dransfield, D. Ehrenreich, A. Erikson, A. Fortier, L. Fossati, M. Fridlund, D. Gandolfi, M. Gillon, M. Güdel, J. Hasiba, G. Hébrard, K. Heng, K. G. Isaak, L. L. Kiss, E. Kopp, V. Kunovac, J. Laskar, A. Lecavelier Des Etangs, M. Lendl, C. Lovis, D. Magrin, J. McCormac, N. J. Miller, V. Nascimbeni, R. Ottensamer, I. Pagano, E. Pallé, F. A. Pepe, G. Peter, G. Piotto, D. Pollacco, D. Queloz, R. Ragazzoni, N. Rando, H. Rauer, I. Ribas, S. Lalitha, A. Santerne, N. C. Santos, G. Scandariato, D. Ségransan, A. E. Simon, A. M.S. Smith, M. Steller, G. M. Szabó, N. Thomas, S. Udry, V. Van Grootel, N. A. Walton

Abstrakt

Eclipsing binaries are important benchmark objects to test and calibrate stellar structure and evolution models. This is especially true for binaries with a fully convective M-dwarf component for which direct measurements of these stars' masses and radii are difficult using other techniques. Within the potential of M-dwarfs to be exoplanet host stars, the accuracy of theoretical predictions of their radius and effective temperature as a function of their mass is an active topic of discussion. Not only the parameters of transiting exoplanets but also the success of future atmospheric characterization relies on accurate theoretical predictions. We present the analysis of five eclipsing binaries with low-mass stellar companions out of a subsample of 23, for which we obtained ultra-high-precision light curves using the CHEOPS satellite. The observation of their primary and secondary eclipses are combined with spectroscopic measurements to precisely model the primary parameters and derive the M-dwarfs mass, radius, surface gravity, and effective temperature estimates using the PYCHEOPS data analysis software. Combining these results to the same set of parameters derived from TESS light curves, we find very good agreement (better than 1 per cent for radius and better than 0.2 per cent for surface gravity). We also analyse the importance of precise orbits from radial velocity measurements and find them to be crucial to derive M-dwarf radii in a regime below 5 per cent accuracy. These results add five valuable data points to the mass-radius diagram of fully convective M-dwarfs.

Organisation(en)

Institut für Astrophysik

Externe Organisation(en)

University of Birmingham, Keele University, Universidade do Porto, Stockholm University, Universität Genf, Aix-Marseille Université, University of Warwick, Ohio State University, Chalmers University of Technology, Universität Bern, Instituto de Astrofísica de Canarias (IAC), Universidad de La Laguna, Spanish National Research Council (CSIC), Institut d'Estudis Espacials de Catalunya (IEEC), European Space Research & Technology Centre (ESA/ESTEC), Admatis, European Space Astronomy Centre (ESA), Österreichische Akademie der Wissenschaften (ÖAW), INAF - Osservatorio Astronomico di Padova, Université Grenoble-Alpes, Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR), Université de Paris, University of St. Andrews, Lund University, Université de Liège, Leiden University, Università degli Studi di Torino, Université Paris VI - Pierre-et-Marie-Curie, MTA Társadalomtudományi Kutatóközpont, Eötvös Loránd University Budapest, Lowell Observatory, Université de recherche Paris Sciences et Lettres, INAF-Osservatorio Astrofisico di Catania, Università degli Studi di Padova, Eidgenössische Technische Hochschule Zürich, University of Cambridge, Technische Universität Berlin, Freie Universität Berlin (FU)

Journal

Monthly Notices of the Royal Astronomical Society

Band

519

Seiten

3546-3563

Anzahl der Seiten

18

ISSN

0035-8711

DOI

https://doi.org/10.1093/mnras/stac2565

Publikationsdatum

03-2023

Peer-reviewed

Ja

ÖFOS 2012

103003 Astronomie, 103004 Astrophysik, 103038 Weltraumforschung

Schlagwörter

ASJC Scopus Sachgebiete

Astronomy and Astrophysics, Space and Planetary Science

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/ca6ce13d-9dfd-49f8-9180-e7b5d5856eaa