J/A+A/625/A150ivo://CDS.VizieR/J/A+A/625/A150doi:10.26093/cds/vizier.36250150CDSvon Boetticher A.Triaud A.H.M.J.Queloz D.Gill S.Maxted P.F.L.,Almleaky Y.Anderson D. R.Bouchy F.Burdanov A.Collier Cameron A.,Delrez L.Ducrot E.Faedi F.Gillon M.Gomez Maqueo Chew Y.Hebb L.,Hellier C.Jehin E.Lendl M.Marmier M.Martin D.V.McCormac J.,Pepe F.Pollacco D.Segransan D.Smalley B.Thompson S.Turner O.,Udry S.Van Grootel V.West R.2019-07-24T12:57:32Z2019-06-04T08:26:53ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsphotometryMeasurements of the physical properties of stars at the lower end of the main sequence are scarce. In this context we report masses, radii and surface gravities of ten very-low-mass stars in eclipsing binary systems, with orbital periods of the order of several days. The objects probe the stellar mass-radius relation in the fully convective regime, M*<0.35M_{sun}_, down to the hydrogen burning mass-limit, M_HB_~0.07M_{sun}_. The stars were detected by the WASP survey for transiting extra-solar planets, as low-mass, eclipsing companions orbiting more massive, F- and G-type host stars. We use eclipse observations of the host stars, performed with the TRAPPIST, Leonhard Euler and SPECULOOS telescopes, and radial velocities of the host stars obtained with the CORALIE spectrograph, to determine the physical properties of the low-mass companions. Surface gravities of the low-mass companions are derived from the eclipse and orbital parameters of each system. Spectroscopic measurements of the host star effective temperature and metallicity are used to infer the host star mass and age from stellar evolution models for solar-type stars. Masses and radii of the low-mass companions are then derived from the eclipse and orbital parameters of the binary systems. The objects are compared to stellar evolution models for low-mass stars, to test for an effect of the stellar metallicity and orbital period on the radius of low-mass stars in close binary systems. Measurements are found to be in good agreement with stellar evolution models; a systematic inflation of the radius of low-mass stars with respect to model predictions is limited to 1.6+/-1.2%, in the fully convective low-mass regime. The sample of ten objects indicates a scaling of the radius of low-mass stars with the host star metallicity. No correlation between stellar radii and the orbital periods of the binary systems is determined. A combined analysis with thirteen comparable objects from the literature is consistent with this result.2019A&A...625A.150Vhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/625/A150CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/625/A150https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/625/A150http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/625/A150https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/625/A150https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/625/A150http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/625/A150GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/625/A150/table1 (Coordinates, magnitudes, and parallax measurements of the host stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/625/A150/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/625/A150/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/625/A150/table1?GETtext/xml+votable180.050000true54.7901253.093750.0055555555555555566/23243 27252 30150 33861-33862 38351 38674 40222 43856 449391.9867573869263685e-19 3.916500758235022e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/625/A150?format=asciidefaultJ/A+A/625/A150/table1Coordinates, magnitudes, and parallax measurements of the host starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName (JHHMM+DDA)meta.id;meta.maincharRA_ICRSRight ascension (ICRS) at epoch 2015.5pos.eq.ra;meta.mainDE_ICRSDeclination (ICRS) at epoch 2015.5pos.eq.dec;meta.mainGmagGaia DR2 G magnitudemagphot.mag;em.optfloatn_Gmag[*] Note on Gmag (1)meta.notecharPlxGaia DR2 absolute parallaxmaspos.parallaxfloate_Plxrms uncertainty on Plxmasstat.error;pos.parallaxfloatRVShow the Coralie and Harps Radial Velocity curvemeta.ref.urlcharCoralieIndicates coralie observations in coralie.dat filemeta.codecharHarpsIndicates Harps observations in coralie.dat filemeta.codecharFTShow the Trappist flux curvemeta.ref.urlcharTrappistIndicates Trappist observations in trap1.dat or trap2.dat filesmeta.codecharFEShow the Euler flux curvemeta.ref.urlcharEulerIndicates Euler observations in euler.dat filemeta.codecharFSShow the Speculoos flux curvemeta.ref.urlcharSpeculoosIndicates Speculoos observations in trap1.dat filemeta.codecharLCShow the Wasp light curvemeta.ref.urlcharWASPIndicates WASP observations in J1115-36-wasp.dat and J2017+02-wasp.dat filesmeta.codechar_RA.icrsRight ascension (ICRS) at Epoch=J2015.5 (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)pos.eq.ranullableindexed_DE.icrsDeclination (ICRS) at Epoch=J2015.5 (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)pos.eq.decnullableindexedJ/A+A/625/A150/coralieCoralie and HARPS radial velocitiesComCommentsmeta.notecharFWHMFWHMkm/sphys.angSizedoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar name (JHHMM+DD)meta.id;meta.maincharInstInstrumentmeta.id;instrcharBJDBarycentric Julian date (BJD-240000)dtime.epochdoubleRVRadial velocitykm/sphys.veloc;pos.heliocentricdoublee_RVrms uncertainty on RVkm/sstat.errordoubleContrastContrast of the cross-correlation functionkm/sphys.velocfloatBISBisector spankm/sphys.velocdoubleNoiseNoisekm/sinstr.det.noisedoublesn10Signal-to-noise ratio 10stat.snrfloatsn50Signal-to-noise ratio 50stat.snrfloatsn60Signal-to-noise ratio 60stat.snrfloatJ/A+A/625/A150/trap1Trappist eclipse observations for J0543-57, J0555-57, J0954-23, J1013+01 and J1431-11SkySkyctphot.mag.sbdoubleAirmassAirmassobs.airMassdoubleFWHMyFWHM on y axispixphys.angSize.sminAxisdoubleFWHMFWHMpixphys.angSizedoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar name (JHHMM+DD), EBLM JHHMM+DDmeta.id;meta.maincharInstInstrumentmeta.id;instrcharJDJulian date (JD-2450000), UTCdtime.epochdoubleFluxFluxctphot.flux.density;em.optdoublee_Fluxrms uncertainty on Fluxctstat.error;phot.fluxdoublexshiftCentroid x_shift on detectorpixinstr.paramdoubleyshiftCentroid y_shift on detectorpixinstr.paramdoubleFWHMxFWHM on x axispixphys.angSize.smajAxisdoubleExptimeExposure timestime.duration;obs.exposuredoubleJ/A+A/625/A150/trap2Trappist eclipse observations for J0339+03, J1115-36 and J2017+02 and Euler J0555-57, J1038-37 and J1403-32recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar name (JHHMM+DD)meta.id;meta.maincharInstInstrumentmeta.id;instrcharHJDHeliocentric Julian date (HJD-2400000)dtime.epochdoubleFluxFluxctphot.flux.density;em.optdoublee_Fluxrms uncertainty on Fluxctstat.error;phot.fluxdoubledXCentroid x_shift on detectorpixinstr.paramdoubledYCentroid x_shift on detectorpixinstr.paramdoubleAirmassAirmassobs.airMassdoubleFWHMFWHMpixphys.angSizedoubleSkySkyctphot.mag.sbdoubleTexpExposure timestime.duration;obs.exposuredoubleJ/A+A/625/A150/eulerEuler eclipse observations for J0555-57, J1038-37 and J1403-32recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar name (JHHMM+DD)meta.id;meta.maincharInstInstrumentmeta.id;instrcharHJDHeilocentric Julian date (HJD-2400000)dtime.epochdoubleFluxFluxctphot.flux.density;em.optdoublee_Fluxrms uncertainty on Fluxctstat.error;phot.fluxdoubledXCentroid x_shift on detectorpixinstr.paramfloatdYCentroid y_shift on detectorpixinstr.paramfloatAirmassAirmassobs.airMassfloatFWHMFWHMpixphys.angSizefloatSkySkyctphot.mag.sbfloatSkyMax? Maximum value for skyctphot.mag.sbdoublenullableTexpExposure timestime.duration;obs.exposurefloatJ/A+A/625/A150/j1115wasJ1115-36 WASP light curverecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian date (HJD-2450000)dtime.epochdoubledmagTamuz-corrected magnitudemagphot.mag;arith.diffdoublee_dmagrms uncertainty on dmagmagstat.error;phot.magdoubleJ/A+A/625/A150/j2017wasJ2017+02 WASP light curverecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian date (HJD-2450000)dtime.epochdoubledmagTamuz-corrected magnitudemagphot.mag;arith.diffdoublee_dmagrms uncertainty on dmagmagstat.error;phot.magdouble