The EBLM Project– XI. Mass, radius, and effective temperature measurements for 23 M-dwarf companions to solar-type stars observed with CHEOPS
Artikel i vetenskaplig tidskrift, 2024
Observations of low-mass stars have frequently shown a disagreement between observed stellar radii and radii predicted by theoretical stellar structure models. This ‘radius inflation’ problem could have an impact on both stellar and exoplanetary science. We present the final results of our observation programme with the CHaracterising ExOPlanet Satellite (CHEOPS) to obtain high-precision light curves of eclipsing binaries with low-mass stellar companions (EBLMs). Combined with the spectroscopic orbits of the solar-type companions, we can derive the masses, radii, and effective temperatures of 23 M-dwarf stars. We use the PYCHEOPS data analysis software to analyse their primary and secondary occultations. For all but one target, we also perform analyses with Transiting Exoplanet Survey Satellite (TESS) light curves for comparison. We have assessed the impact of starspot-induced variation on our derived parameters and account for this in our radius and effective temperature uncertainties using simulated light curves. We observe trends in inflation with both metallicity and orbital separation. We also observe a strong trend in the difference between theoretical and observational effective temperatures with metallicity. There is no such trend with orbital separation. These results are not consistent with the idea that the observed inflation in stellar radius combines with lower effective temperature to preserve the luminosity predicted by low-mass stellar models. Our EBLM systems provide high-quality and homogeneous measurements that can be used in further studies of radius inflation.
stars: fundamental parameters
stars: low-mass
binaries: eclipsing
techniques: photometric
techniques: spectroscopic
Författare
M.I. Swayne
Keele University
P. Maxted
Keele University
Amaury Triaud
University of Birmingham
S. G. Sousa
Universidade do Porto
A. Deline
Université de Genève
D. Ehrenreich
Université de Genève
S. Hoyer
Laboratoire d'Astrophysique de Marseille
G. Olofsson
Stockholms universitet
I. Boisse
Laboratoire d'Astrophysique de Marseille
A. Duck
Tufts University
S. Gill
The University of Warwick
D. Martin
Tufts University
J. McCormac
The University of Warwick
Carina Persson
Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik
A. Santerne
Laboratoire d'Astrophysique de Marseille
D. Sebastian
University of Birmingham
M.R. Standing
Open University
L. Acuña
Laboratoire d'Astrophysique de Marseille
Y. Alibert
Universität Bern
R. Alonso
Instituto de Astrofísica de Canarias
G. Anglada
Institut de Ciències de l'Espai (ICE) - CSIC
T. Bárczy
Admatis
D. Barrado Navascues
European Space Astronomy Centre (ESAC)
S.C.C. Barros
Universidade do Porto
W. Baumjohann
Institut fur Weltraumforschung
T.A. Baycroft
University of Birmingham
M. Beck
Université de Genève
T. Beck
Universität Bern
W. Benz
Universität Bern
N. Billot
Université de Genève
X. Bonfils
Institut de Planétologie et d’Astrophysique de Grenoble (IPAG)
L. Borsato
Istituto nazionale di astrofisica (INAF)
V. Bourrier
Université de Genève
A. Brandeker
Stockholms universitet
C. Broeg
Universität Bern
A. Carmona
Institut de Planétologie et d’Astrophysique de Grenoble (IPAG)
S. Charnoz
Institut de Physique du Globe de Paris
A. Collier Cameron
University of St Andrews
Pía Cortés-Zuleta
Laboratoire d'Astrophysique de Marseille
Szilard Csizmadia
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
P. E. Cubillos
Institut fur Weltraumforschung
M. B. Davies
Lunds universitet
M. Deleuil
Laboratoire d'Astrophysique de Marseille
X. Delfosse
Institut de Planétologie et d’Astrophysique de Grenoble (IPAG)
L. Delrez
Universite de Liège
O. Demangeon
Universidade do Porto
B.O. Demory
Universität Bern
Georgina Dransfield
University of Birmingham
Anders Erikson
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
A. Fortier
Universität Bern
T. Forveille
Institut de Planétologie et d’Astrophysique de Grenoble (IPAG)
L. Fossati
Institut fur Weltraumforschung
Malcolm Fridlund
Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik
D. Gandolfi
Universita degli Studi di Torino
Michaël Gillon
Universite de Liège
M. Gudel
Universität Wien
Maximilian N. Günther
European Space Research and Technology Centre (ESA ESTEC)
N.C. Hara
Université de Genève
G. Hebrard
Institut d 'Astrophysique de Paris
N. Heidari
Laboratoire d'Astrophysique de Marseille
Coel Hellier
Keele University
Ch. Helling
Institut fur Weltraumforschung
K. Isaak
European Space Research and Technology Centre (ESA ESTEC)
F. Kerschbaum
Universität Wien
F. Kiefer
Institut d 'Astrophysique de Paris
L. L. Kiss
Magyar Tudomanyos Akademia
V. Kunovac
The University of Warwick
S. Lalitha
University of Birmingham
K. W.F. Lam
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
J. Laskar
Observatoire de Paris
A. Lecavelier des Etangs
Institut d 'Astrophysique de Paris
M. Lendl
Université de Genève
D. Magrin
Istituto nazionale di astrofisica (INAF)
L. Marafatto
Istituto nazionale di astrofisica (INAF)
E. Martioli
Institut d 'Astrophysique de Paris
N.J. Miller
Polish Academy of Sciences
C. Mordasini
Universität Bern
C. Moutou
Institut de Recherche en Astrophysique et Planétologie (IRAP)
Valerio Nascimbeni
Istituto nazionale di astrofisica (INAF)
R. Ottensamer
Universität Wien
I. Pagano
Istituto nazionale di astrofisica (INAF)
Enric Palle
Instituto de Astrofísica de Canarias
G. Peter
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
D. Piazza
Universität Bern
Giampaolo P. Piotto
Istituto nazionale di astrofisica (INAF)
D. Pollacco
The University of Warwick
D. Queloz
Eidgenössische Technische Hochschule Zürich (ETH)
R. Ragazzoni
Istituto nazionale di astrofisica (INAF)
N. Rando
European Space Research and Technology Centre (ESA ESTEC)
H. Rauer
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
I. Ribas
Institut de Ciències de l'Espai (ICE) - CSIC
N. C. Santos
Universidade do Porto
Gaetano Scandariato
Istituto nazionale di astrofisica (INAF)
D. Segransan
Université de Genève
A.E. Simon
Universität Bern
A. M.S. Smith
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
R. Southworth
European Space Research and Technology Centre (ESA ESTEC)
M. Stalport
Universite de Liège
G.M. Szabó
Eötvös Loránd University (ELTE)
Nicolas Thomas
Universität Bern
S. Udry
Université de Genève
B. Ulmer
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
V. Van Grootel
Universite de Liège
J. Venturini
Université de Genève
N. A. Walton
University of Cambridge
E. Willett
University of Birmingham
T.G. Wilson
University of St Andrews
Monthly Notices of the Royal Astronomical Society
00358711 (ISSN) 13652966 (eISSN)
Vol. 528 4 5703-5722Ämneskategorier
Astronomi, astrofysik och kosmologi
DOI
10.1093/mnras/stad3866