J/MNRAS/506/306ivo://CDS.VizieR/J/MNRAS/506/306doi:10.26093/cds/vizier.75060306CDSSwayne M.I.Maxted P.F.L.Triaud A.H.M.J.Sousa S.G.Broeg C.,Floren H.-G.Guterman P.Simon A.E.Boisse I.Bonfanti A.Martin D.,Santerne A.Salmon S.Standing M.R.Van Grootel V.Wilson T.G.,Alibert Y.Alonso R.Anglada Escude G.Asquier J.Barczy T.Barrado D.,Barros S.C.C.Battley M.Baumjohann W.Beck M.Beck T.Bekkelien A.,Benz W.Billot N.Bonfils X.Brandeker A.Busch M.-D.Cabrera J.,Charnoz S.Collier Cameron A.Csizmadia Sz.Davies M.B.Deleuil M.,Deline A.Delrez L.Demangeon O.D.S.Demory B.-O.Dransfield G.,Ehrenreich D.Erikson A.Fortier A.Fossati L.Fridlund M.Futyan D.,Gandolfi D.Gillon M.Guedel M.Hebrard G.Heidari N.Hellier C.,Heng K.Hobson M.Hoyer S.Isaak K.G.Kiss L.Kunovac Hodzic V.,Lalitha S.Laskar J.Lecavelier des Etangs A.Lendl M.Lovis C.,Magrin D.Marafatto L.McCormac J.Miller N.Nascimbeni V.Olofsson G.,Ottensamer R.Pagano I.Palle E.Peter G.Piotto G.Pollacco D.,Queloz D.Ragazzoni R.Rando N.Rauer H.Ribas I.Santos N.C.,Scandariato G.Segransan D.Smith A.M.S.Steinberger M.Steller M.,Szabo G.M.Thomas N.Udry S.Walter I.Walton N.A.Willett E.2024-08-21T20:18:15Z2021-07-16T10:21:54ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.freclipsing-binary-starsm-starsphotometryThe 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 ~24 new mass, radius and effective temperature measurements for very low mass stars within the next few years.2021MNRAS.506..306Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/506/306CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/506/306https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/506/306http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/506/306https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/506/306https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/506/306http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/506/306GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/506/306/list (List of fits files)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/506/306/list?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/506/306/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/506/306/list?GETtext/xml+votable180.050000true265.33862531.41536110.0055555555555555566/12334 32689 47528https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/506/306?format=asciidefaultJ/MNRAS/506/306/j1741Detrended CHEOPS light curve containing the transit and eclipse of EBLM J1741+31recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTimeTime of observation (JD-2450000)dtime.epochdoubleFluxDetrended fluxphot.flux;arith.ratiodoublee_FluxError on fluxstat.error;phot.fluxdoubleJ/MNRAS/506/306/j1934Detrended CHEOPS light curve containing the transit and eclipse of EBLM J1934-42recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTimeTime of observation (JD-2450000)dtime.epochdoubleFluxDetrended fluxphot.flux;arith.ratiodoublee_FluxError on fluxstat.error;phot.fluxdoubleJ/MNRAS/506/306/j2046Detrended CHEOPS light curve containing the transit and eclipse of EBLM J2046+06recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTimeTime of observation (JD-2450000)dtime.epochdoubleFluxDetrended fluxphot.flux;arith.ratiodoublee_FluxError on fluxstat.error;phot.fluxdoubleJ/MNRAS/506/306/listList of fits filesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension of center (J2000)pos.eq.ra;meta.mainDEJ2000Declination of center (J2000)pos.eq.dec;meta.mainNxNumber of observationsmeta.numberintObs.DateObservation Datestime.epoch;obsnullablesizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitschar