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: fundamental parameters

techniques: spectroscopic

stars: low-mass

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

University of La Laguna

Instituto de Astrofísica de Canarias

G. Anglada Escude

Spanish National Research Council (CSIC)

Institute of Space Studies of Catalonia (IEEC)

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

Pierre and Marie Curie University (UPMC)

Aix Marseille University

N. Heidari

Aix Marseille University

Shahid Beheshti University

Université Nice Sophia Antipolis (UNS)

C. Hellier

Keele University

K. Heng

University of Bern

The University of Warwick

M. Hobson

Millennium Institute of Astrophysics

Pontificia Universidad Catolica de Chile

S. Hoyer

Aix Marseille University

K. G. Isaak

European Space Research and Technology Centre (ESA ESTEC)

L. Kiss

The University of Sydney

Eötvös Loránd University (ELTE)

Hungarian Academy of Sciences

V. Kunovac Hodzic

Stockholm University

S. Lalitha

University of Birmingham

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

Osservatorio Astronomico di Padova

L. Marafatto

Osservatorio Astronomico di Padova

J. McCormac

The University of Warwick

N. Miller

Keele University

V Nascimbeni

Osservatorio Astronomico di Padova

G. Olofsson

Stockholm University

R. Ottensamer

University of Vienna

I Pagano

Osservatorio Astrofisico di Catania

E. Palle

Instituto de Astrofísica de Canarias

University of La Laguna

G. Peter

German Aerospace Center (DLR)

G. Piotto

Osservatorio Astronomico di Padova

University of Padua

D. Pollacco

The University of Warwick

D. Queloz

University of Cambridge

University of Geneva

R. Ragazzoni

Osservatorio Astronomico di Padova

University of Padua

N. Rando

European Space Agency (ESA)

H. Rauer

German Aerospace Center (DLR)

Freie Universität Berlin

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

Osservatorio Astrofisico di Catania

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 1 306-322

Subject Categories

Subatomic Physics

Astronomy, Astrophysics and Cosmology

Other Physics Topics

DOI

10.1093/mnras/stab1687

More information

Latest update

10/28/2021