techniques: photometric; techniques: spectroscopic; binaries:; eclipsing; stars: fundamental parameters; stars: low-mass; Astrophysics; - Solar and Stellar Astrophysics; Astrophysics - Earth and Planetary
Abstract :
[en] 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.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
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Sousa, S. G.; University of Porto, Center for Astrophysics
Deline, A.; University of Geneva, Astronomical Observatory
Ehrenreich, D.; University of Geneva, Astronomical Observatory, University of Geneva, Switzerland
Hoyer, S.; Aix Marseille Univ, CNRS, CNES, LAM, 38 rue Frédéric Joliot-Curie, FR-13388 Marseille, France
Olofsson, G.; AlbaNova University Center
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Duck, A.; Tufts University, Department of Physics and Astronomy
Gill, S.; University of Warwick, Department of Physics
Martin, D.; Tufts University, Department of Physics and Astronomy
McCormac, J.; University of Warwick, Department of Physics
Persson, C. M.; Onsala Space Observatory
Santerne, A.; Aix Marseille Univ, CNRS, CNES, LAM, 38 rue Frédéric Joliot-Curie, FR-13388 Marseille, France
Sebastian, D.; University of Birmingham, School of Physics and Astronomy
Standing, M. R.; Open University, Department of Physical Sciences
Acuña, L.; Aix Marseille Univ, CNRS, CNES, LAM, 38 rue Frédéric Joliot-Curie, FR-13388 Marseille, France
Alibert, Y.; University of Bern, Switzerland, -
Alonso, R.; Instituto de Astrofisica de Canarias, Via Lactea s/n, ES-38200 La Laguna, Tenerife, Spain, Departamento de Astrofisica, Universidad de La Laguna, Astrofísico Francisco Sanchez s/n, ES-38206 La Laguna, Tenerife, Spain
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Baycroft, T. A.; University of Birmingham, School of Physics and Astronomy
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