The EBLM project - VIII. First results for M-dwarf mass, radius, and effective temperature measurements using CHEOPS light curves
Journal article, 2021
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 similar to 24 new mass, radius, and effective temperature measurements for very low-mass stars within the next few years.
binaries: eclipsing
stars: low-mass
stars: fundamental parameters
techniques: spectroscopic
techniques: photometric
Author
Swayne
Keele University
P. F. L. Maxted
Keele University
Amaury Triaud
University of Birmingham
S. G. Sousa
University of Porto
C. Broeg
University of Bern
H-G Floren
Stockholm University
P. Guterman
Institut National des Sciences de l'Univers
Aix Marseille University
A. E. Simon
University of Bern
I Boisse
Aix Marseille University
A. Bonfanti
Austrian Academy of Sciences
D. Martin
Ohio State University
A. Santerne
Aix Marseille University
S. Salmon
University of Geneva
M. R. Standing
University of Birmingham
V. Van Grootel
University of Liège
T. G. Wilson
University of St Andrews
Y. Alibert
University of Bern
R. Alonso
Instituto de Astrofísica de Canarias
University of La Laguna
G. Anglada Escude
Institute of Space Studies of Catalonia (IEEC)
Spanish National Research Council (CSIC)
J. Asquier
European Space Agency (ESA)
T. Barczy
Admatis
D. Barrado
Spanish Astrobiology Center (INTA-CSIC)
S. C. C. Barros
University of Porto
M. Battley
The University of Warwick
W. Baumjohann
Austrian Academy of Sciences
M. Beck
University of Geneva
T. Beck
University of Bern
A. Bekkelien
University of Geneva
W. Benz
University of Bern
N. Billot
University of Geneva
X. Bonfils
Grenoble Alpes University
A. Brandeker
Stockholm University
M-D Busch
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
A. Deline
University of Geneva
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
Leiden University
D. Futyan
University of Geneva
D. Gandolfi
University of Turin
M. Gillon
University of Liège
M. Guedel
University of Vienna
G. Hebrard
Sorbonne University
Aix Marseille University
N. Heidari
Shahid Beheshti University
Université Nice Sophia Antipolis (UNS)
Aix Marseille University
C. Hellier
Keele University
K. Heng
University of Bern
The University of Warwick
M. Hobson
Pontificia Universidad Catolica de Chile
Millennium Institute of Astrophysics
S. Hoyer
Aix Marseille University
K. G. Isaak
European Space Research and Technology Centre (ESA ESTEC)
L. Kiss
Eötvös Loránd University (ELTE)
The University of Sydney
Hungarian Academy of Sciences
V. Kunovac Hodzic
Stockholm University
S. Lalitha
University of Birmingham
J. Laskar
Sorbonne University
A. Lecavelier des Etangs
Sorbonne University
M. Lendl
University of Geneva
C. Lovis
University of Geneva
D. Magrin
Istituto nazionale di astrofisica (INAF)
L. Marafatto
Istituto nazionale di astrofisica (INAF)
J. McCormac
The University of Warwick
N. Miller
Keele University
V Nascimbeni
Istituto nazionale di astrofisica (INAF)
G. Olofsson
Stockholm University
R. Ottensamer
University of Vienna
I Pagano
Istituto nazionale di astrofisica (INAF)
E. Palle
Instituto de Astrofísica de Canarias
University of La Laguna
G. Peter
German Aerospace Center (DLR)
G. Piotto
University of Padua
Istituto nazionale di astrofisica (INAF)
D. Pollacco
The University of Warwick
D. Queloz
University of Cambridge
University of Geneva
R. Ragazzoni
Istituto nazionale di astrofisica (INAF)
University of Padua
N. Rando
European Space Agency (ESA)
H. Rauer
Freie Universität Berlin
German Aerospace Center (DLR)
Technische Universität Berlin
I Ribas
Institute of Space Studies of Catalonia (IEEC)
Spanish National Research Council (CSIC)
N. C. Santos
University of Porto
G. Scandariato
Istituto nazionale di astrofisica (INAF)
D. Segransan
University of Geneva
A. M. S. Smith
German Aerospace Center (DLR)
M. Steinberger
Austrian Academy of Sciences
M. Steller
Austrian Academy of Sciences
Gy M. Szabo
Eötvös Loránd University (ELTE)
N. Thomas
University of Bern
S. Udry
University of Geneva
I Walter
German Aerospace Center (DLR)
N. A. Walton
University of Cambridge
E. Willett
University of Birmingham
Monthly Notices of the Royal Astronomical Society
0035-8711 (ISSN) 1365-2966 (eISSN)
Vol. 506 1 306-322Subject Categories
Subatomic Physics
Astronomy, Astrophysics and Cosmology
Other Physics Topics
DOI
10.1093/mnras/stab1687