The EBLM project : IX. Five fully convective M-dwarfs, precisely measured with CHEOPS and TESS light curves
Date
03/2023Author
Funder
Grant ID
ST/V000861/1
ST/R003203/1
ST/R00824/1
Keywords
Metadata
Show full item recordAltmetrics Handle Statistics
Altmetrics DOI Statistics
Abstract
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.
Citation
Sebastian , D , Swayne , M I , Maxted , P F L , Triaud , A H M J , Sousa , S G , Olofsson , G , Beck , M , Billot , N , Hoyer , S , Gill , S , Heidari , N , Martin , D V , Persson , C M , Standing , M R , Alibert , Y , Alonso , R , Anglada , G , Asquier , J , Bárczy , T , Barrado , D , Barros , S C C , Battley , M P , Baumjohann , W , Beck , T , Benz , W , Bergomi , M , Boisse , I , Bonfils , X , Brandeker , A , Broeg , C , Cabrera , J , Charnoz , S , Cameron , A C , Csizmadia , S , Davies , M B , Deleuil , M , Delrez , L , Demangeon , O D S , Demory , B-O , Dransfield , G , Ehrenreich , D , Erikson , A , Fortier , A , Fossati , L , Fridlund , M , Gandolfi , D , Gillon , M , Güdel , M , Hasiba , J , Hébrard , G , Heng , K , Isaak , K G , Kiss , L L , Kopp , E , Kunovac , V , Laskar , J , des Etangs , A L , Lendl , M , Lovis , C , Magrin , D , McCormac , J , Miller , N J , Nascimbeni , V , Ottensamer , R , Pagano , I , Pallé , E , Pepe , F A , Peter , G , Piotto , G , Pollacco , D , Queloz , D , Ragazzoni , R , Rando , N , Rauer , H , Ribas , I , Lalitha , S , Santerne , A , Santos , N C , Scandariato , G , Ségransan , D , Simon , A E , Smith , A M S , Steller , M , Szabó , G M , Thomas , N , Udry , S , Van Grootel , V & Walton , N A 2023 , ' The EBLM project : IX. Five fully convective M-dwarfs, precisely measured with CHEOPS and TESS light curves ' , Monthly Notices of the Royal Astronomical Society , vol. 519 , no. 3 , stac2565 . https://doi.org/10.1093/mnras/stac2565
Publication
Monthly Notices of the Royal Astronomical Society
Status
Peer reviewed
ISSN
0035-8711Type
Journal article
Rights
Copyright © The Author(s) 2022. Published by Oxford University Press on behalf of Royal Astronomical Society. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
Description
Funding information: ACC acknowledges support from STFC consolidated grant numbers ST/R000824/1 and ST/V000861/1, and UKSA grant number ST/R003203/1. This project was supported by the CNES.Collections
Items in the St Andrews Research Repository are protected by copyright, with all rights reserved, unless otherwise indicated.