binaries: eclipsing; stars: fundamental parameters; stars: low-mass; techniques: photometric; techniques: spectroscopic; Astrophysics - Solar; and Stellar Astrophysics; Astrophysics - Earth and Planetary; Astrophysics
Abstract :
[en] 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 characterisation rely on accurate theoretical predictions. We present the analysis of five eclipsing binaries with low-mass stellar companions out of a sub-sample 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% for radius and better than 0.2% 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% accuracy. These results add five valuable data points to the mass-radius diagram of fully-convective M-dwarfs.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Sebastian, D.; School of Physics, and Astronomy, University of Birmingham, Edgbaston, Birmimgham, B15 2TT, UK
Swayne, M. I.; Keele University, Department of Physics and Astrophysics
Maxted, P. F. L.; Keele University, Department of Physics and Astrophysics
Triaud, A. H. M. J.; School of Physics, and Astronomy, University of Birmingham, Edgbaston, Birmimgham, B15 2TT, UK
Sousa, S. G.; University of Porto, Center for Astrophysics
Olofsson, G.; AlbaNova University Center
Beck, M.; Observatoire Astronomique de l'Université de Genéve, Chemin Pegasi 51, Versoix, Switzerland
Billot, N.; Observatoire Astronomique de l'Université de Genéve, Chemin Pegasi 51, Versoix, Switzerland
Bonfils, X.; Institute de Planetologie et d'Astrophysique de Grenoble
Brandeker, A.; AlbaNova University Center
Broeg, C.; University of Bern, Physics Institute, -
Cabrera, J.; Helmholtz Institute for Planetary Research, Berlin
Charnoz, S.; Institut de Physique du Globe de Paris
Cameron, A. Collier; Scottish Universities Physics Alliance
Csizmadia, Sz; Helmholtz Institute for Planetary Research, Berlin
Davies, M. B.; University of Lund, Sweden
Deleuil, M.; Aix-Marseille Universite, Laboratoire d'Astrophysique
Delrez, Laetitia ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Exoplanets in Transit: Identification and Characterization
Demangeon, O. D. S.; University of Porto, Center for Astrophysics, -
Demory, B. -O.; Center for Space and Habitability, Gesellsschaftstrasse 6, 3012 Bern, Switzerland
Dransfield, G.; School of Physics, and Astronomy, University of Birmingham, Edgbaston, Birmimgham, B15 2TT, UK
Ehrenreich, D.; Observatoire Astronomique de l'Université de Genéve, Chemin Pegasi 51, Versoix, Switzerland
Erikson, A.; Helmholtz Institute for Planetary Research, Berlin
Fortier, A.; University of Bern, Physics Institute, -
Fossati, L.; Austrian Institute of Space Science Research
Fridlund, M.; Leiden Observatory, Onsala Space Observatory
Gandolfi, D.; University of Turin, Department of Physics
Gillon, Michaël ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Exoplanets in Transit: Identification and Characterization
Güdel, M.; University of Vienna, Department of Astronomy
Hasiba, J.; Austrian Institute of Space Science Research
Hébrard, G.; Institut d'Astrophysique de Paris
Heng, K.; Center for Space and Habitability, Gesellsschaftstrasse 6, 3012 Bern, Switzerland, Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, United Kingdom
Isaak, K. G.; Science and Operations Department - Science Division (SCI-SC), Directorate of Science, European Space Agency (ESA), European Space Research and Technology Centre (ESTEC), Keplerlaan 1, 2201-AZ Noordwijk, The Netherlands
Kiss, L. L.; Konkoly Observatory, -
Kopp, E.; Helmholtz Institute for Planetary Research, Berlin
Kunovac, V.; School of Physics, and Astronomy, University of Birmingham, Edgbaston, Birmimgham, B15 2TT, UK
Laskar, J.; Observatoire de Paris, Institut de Mecanique Celeste et de Calcul des Ephemerides
des Etangs, A. Lecavelier; Institut d'Astrophysique de Paris
Lendl, M.; Observatoire Astronomique de l'Université de Genéve, Chemin Pegasi 51, Versoix, Switzerland
Lovis, C.; Observatoire Astronomique de l'Université de Genéve, Chemin Pegasi 51, Versoix, Switzerland
Magrin, D.; Astronomical Observatory of Padua
McCormac, J.; University of Warwick, Department of Physics
Miller, N. J.; Keele University, Department of Physics and Astrophysics
Nascimbeni, V.; Astronomical Observatory of Padua
Ottensamer, R.; University of Vienna, Department of Astronomy
Pagano, I.; German Aerospace Center, Berlin
Pallé, E.; Astrophysical Institute of the Canaries
Pepe, F. A.; Observatoire Astronomique de l'Université de Genéve, Chemin Pegasi 51, Versoix, Switzerland
Peter, G.; Astronomical Observatory of Padua
Piotto, G.; Astronomical Observatory of Padua, -
Pollacco, D.; University of Warwick, Department of Physics
Queloz, D.; University of Cambridge, Institute of Astronomy, Technical University of Berlin, Center for Astronomy and Astrophysics
Ragazzoni, R.; Astronomical Observatory of Padua, -
Rando, N.; ESTEC, European Space Agency, 2201AZ, Noordwijk, NL
Rauer, H.; Helmholtz Institute for Planetary Research, Berlin, Free University of Berlin, Department of Geosciences, Eotvos Lorand University, Hungary
Ribas, I.; Institut de Ciencies de l'Espai (ICE, CSIC), Campus UAB, Can Magrans s/n, 08193 Bellaterra, Spain, Institut d'Estudis Espacials de Catalunya (IEEC), 08034 Barcelona, Spain
Lalitha, S.; School of Physics, and Astronomy, University of Birmingham, Edgbaston, Birmimgham, B15 2TT, UK
Santos, N. C.; University of Porto, Center for Astrophysics, -
Scandariato, G.; German Aerospace Center, Berlin
Ségransan, D.; Observatoire Astronomique de l'Université de Genéve, Chemin Pegasi 51, Versoix, Switzerland
Simon, A. E.; University of Bern, Physics Institute
Smith, A. M. S.; Helmholtz Institute for Planetary Research, Berlin
Steller, M.; Austrian Institute of Space Science Research
Szabó, Gy M.; Eotvos Lorand University, Hungary, University of Cambridge, Institute of Astronomy
Thomas, N.; University of Bern, Physics Institute
Udry, S.; Observatoire Astronomique de l'Université de Genéve, Chemin Pegasi 51, Versoix, Switzerland
Van Grootel, Valérie ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie
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1School of Physics & Astronomy, University of Birmingham, Edgbaston, Birmimgham B15 2TT, UK
2Astrophysics Group, Keele University, Staffordshire ST5 5BG, UK
3Instituto de Astrofisica e Ciencias do Espaco, Universidade do Porto, CAUP, Rua das Estrelas, P-4150-762 Porto, Portugal
4Department of Astronomy, Stockholm University, AlbaNova University Center, SE-10691 Stockholm, Sweden
5Observatoire Astronomique de l’Université de Genève, Chemin Pegasi 51, CH-1290 Versoix, Switzerland
6Aix Marseille University, CNRS, CNES, LAM, 38 rue Frédéric Joliot-Curie, F-13388 Marseille, France
7Department of Physics, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK
8Department of Astronomy, The Ohio State University, 4055 McPherson Laboratory, Columbus, OH 43210, USA
9Department of Space, Earth and Environment, Chalmers University of Technology, Onsala Space Observatory, SE-43992 Onsala, Sweden
10Physikalisches Institut, University of Bern, Gesellsschaftstrasse 6, CH-3012 Bern, Switzerland
11Instituto de Astrofisica de Canarias, E-38200 La Laguna, Tenerife, Spain
12Departamento de Astrofisica, Universidad de La Laguna, E-38206 La Laguna, Tenerife, Spain
13Institut de Ciencies de l’Espai (ICE, CSIC), Campus UAB, Can Magrans s/n, E-08193 Bellaterra, Spain
14Institut d’Estudis Espacials de Catalunya (IEEC), E-08034 Barcelona, Spain
15ESTEC, European Space Agency, NL-2201AZ Noordwijk, the Netherlands
16Admatis, 5. Kandó Kálmán Street, 3534 Miskolc, Hungary
17Departamento de Astrofisica, Centro de Astrobiologia (CSIC-INTA), ESAC Campus, E-28692 Villanueva de la Cañada (Madrid), Spain
18Departamento de Fisica e Astronomia, Faculdade de Ciencias, Universidade do Porto, Rua do Campo Alegre, P-4169-007 Porto, Portugal
19Space Research Institute, Austrian Academy of Sciences, Schmiedlstrasse 6, A-8042 Graz, Austria
20Center for Space and Habitability, Gesellsschaftstrasse 6, CH-3012 Bern, Switzerland
22Université Grenoble Alpes, CNRS, IPAG, F-38000 Grenoble, France
23Institute of Planetary Research, German Aerospace Center (DLR), Rutherfordstrasse 2, D-12489 Berlin, Germany
24Université de Paris, Institut de physique du globe de Paris, CNRS, F-75005 Paris, France
25Centre for Exoplanet Science, SUPA School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews KY16 9SS, UK
26Centre for Mathematical Sciences, Lund University, Box 118, SE-221 00 Lund, Sweden
27Astrobiology Research Unit, Université de Liège, Allée du 6 Août 19C, B-4000 Liège, Belgium
28Space sciences, Technologies and Astrophysics Research (STAR) Institute, Université de Liège, Allée du 6 Août 19C, B-4000 Liège, Belgium
29Leiden Observatory, University of Leiden, PO Box 9513, NL-2300 RA Leiden, the Netherlands
30Dipartimento di Fisica, Universita degli Studi di Torino, via Pietro Giuria 1, I-10125 Torino, Italy
31University of Vienna, Department of Astrophysics, Türkenschanzstrasse 17, A-1180 Vienna, Austria
32Institut d’astrophysique de Paris, UMR7095 CNRS, Université Pierre & Marie Curie, 98bis blvd. Arago, F-75014 Paris, France
33Science and Operations Department - Science Division (SCI-SC), Directorate of Science, European Space Agency (ESA), European Space Research and Technology Centre (ESTEC), Keplerlaan 1, NL-2201-AZ Noordwijk, the Netherlands
34Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, 1121 Budapest, Konkoly Thege Miklós út 15-17, Hungary
35ELTE Eötvös Loránd University, Institute of Physics, Pázmány Péter sétány 1/A, 1117, Hungary
36IMCCE, UMR8028 CNRS, Observatoire de Paris, PSL Univ., Sorbonne Univ., 77 av. Denfert-Rochereau, F-75014 Paris, France
37INAF, Osservatorio Astrofisico di Catania, Via S. Sofia 78, I-95123 Catania, Italy
38Institute of Optical Sensor Systems, German Aerospace Center (DLR), Rutherfordstrasse 2, D-12489 Berlin, Germany
39Dipartimento di Fisica e Astronomia ‘Galileo Galilei’, Universita degli Studi di Padova, Vicolo dell’Osservatorio 3, I-35122 Padova, Italy
40ETH Zurich, Department of Physics, Wolfgang-Pauli-Strasse 2, CH-8093 Zurich, Switzerland
41Cavendish Laboratory, JJ Thomson Avenue, Cambridge CB3 0HE, UK
42Center for Astronomy and Astrophysics, Technical University Berlin, Hardenberstrasse 36, D-10623 Berlin, Germany
43Institut für Geologische Wissenschaften, Freie Universität Berlin, D-12249 Berlin, Germany
44ELTE Eötvös Loránd University, Gothard Astrophysical Observatory, 9700 Szombathely, Szent Imre h. u. 112, Hungary
45MTA-ELTE Exoplanet Research Group, 9700 Szombathely, Szent Imre h. u. 112, Hungary
46Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK
47Lowell Observatory, 1400 W. Mars Hill Rd., Flagstaff, AZ 86001, USA
