The EBLM project - IX. Five fully convective M-dwarfs, precisely measured with CHEOPS and TESS light curves
Journal article, 2023
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 percent for radius and better than 0.2 percent 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 percent accuracy. These results add five valuable data points to the mass-radius diagram of fully convective M-dwarfs.
techniques: spectroscopic
stars: fundamental parameters
binaries: eclipsing
stars: low-mass
techniques: photometric
Author
D. Sebastian
University of Birmingham
M. I. Swayne
Keele University
P. F. L. Maxted
Keele University
Amaury Triaud
University of Birmingham
S. G. Sousa
University of Porto
G. Olofsson
Stockholm University
M. Beck
University of Geneva
N. Billot
University of Geneva
S. Hoyer
Aix Marseille University
S. Gill
The University of Warwick
N. Heidari
Aix Marseille University
D. V. Martin
Ohio State University
Carina Persson
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
M. R. Standing
University of Birmingham
Y. Alibert
University of Bern
R. Alonso
University of La Laguna
Instituto de Astrofísica de Canarias
G. Anglada
Spanish National Research Council (CSIC)
Institute of Space Studies of Catalonia (IEEC)
J. Asquier
European Space Agency (ESA)
T. Barczy
Admatis
D. Barrado
Spanish National Research Council (CSIC)
S.C.C. Barros
University of Porto
M. P. Battley
The University of Warwick
W. Baumjohann
Austrian Academy of Sciences
T. Beck
University of Bern
W. Benz
University of Bern
M. Bergomi
Istituto nazionale di astrofisica (INAF)
I. Boisse
Aix Marseille University
X. Bonfils
Grenoble Alpes University
A. Brandeker
Stockholm University
C. Broeg
University of Bern
J. Cabrera
German Aerospace Center (DLR)
S. Charnoz
Paris Descartes University
A. Collier Cameron
University of St Andrews
Sz Csizmadia
German Aerospace Center (DLR)
M. B. Davies
Lund University
M. Deleuil
Aix Marseille University
L. Delrez
University of Liège
O. D. S. Demangeon
University of Porto
B-O Demory
University of Bern
G. Dransfield
University of Birmingham
D. Ehrenreich
University of Geneva
A. Erikson
German Aerospace Center (DLR)
A. Fortier
University of Bern
L. Fossati
Austrian Academy of Sciences
Malcolm Fridlund
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
D. Gandolfi
University of Turin
M. Gillon
University of Liège
M. Guedel
University of Vienna
J. Hasiba
Austrian Academy of Sciences
G. Hebrard
Pierre and Marie Curie University (UPMC)
K. Heng
The University of Warwick
University of Bern
K. G. Isaak
European Space Research and Technology Centre (ESA ESTEC)
L. L. Kiss
Eötvös Loránd University (ELTE)
Konkoly Observatory
E. Kopp
German Aerospace Center (DLR)
V. Kunovac
University of Birmingham
Lowell Observatory
J. Laskar
Sorbonne University
A. Lecavelier des Etangs
Pierre and Marie Curie University (UPMC)
M. Lendl
University of Geneva
C. Lovis
University of Geneva
D. Magrin
Istituto nazionale di astrofisica (INAF)
J. McCormac
The University of Warwick
N. J. Miller
Keele University
V. Nascimbeni
Istituto nazionale di astrofisica (INAF)
R. Ottensamer
University of Vienna
I. Pagano
Istituto nazionale di astrofisica (INAF)
E. Palle
Instituto de Astrofísica de Canarias
F. A. Pepe
University of Geneva
G. Peter
German Aerospace Center (DLR)
G. Piotto
University of Padua
Istituto nazionale di astrofisica (INAF)
D. Pollacco
The University of Warwick
D. Queloz
Swiss Federal Institute of Technology in Zürich (ETH)
University of Cambridge
R. Ragazzoni
Istituto nazionale di astrofisica (INAF)
University of Padua
N. Rando
European Space Agency (ESA)
H. Rauer
German Aerospace Center (DLR)
Eötvös Loránd University (ELTE)
Freie Universität Berlin
I. Ribas
Spanish National Research Council (CSIC)
Institute of Space Studies of Catalonia (IEEC)
S. Lalitha
University of Birmingham
A. Santerne
Aix Marseille University
N. C. Santos
University of Porto
G. Scandariato
Istituto nazionale di astrofisica (INAF)
D. Segransan
University of Geneva
A. E. Simon
University of Bern
A. M. S. Smith
German Aerospace Center (DLR)
M. Steller
Austrian Academy of Sciences
Gy M. Szabo
Eötvös Loránd University (ELTE)
N. Thomas
University of Bern
S. Udry
University of Geneva
V. Van Grootel
University of Liège
N. A. Walton
University of Cambridge
Monthly Notices of the Royal Astronomical Society
0035-8711 (ISSN) 1365-2966 (eISSN)
Vol. 519 3 3546-3563Subject Categories
Astronomy, Astrophysics and Cosmology
DOI
10.1093/mnras/stac2565