J/MNRAS/451/2263ivo://CDS.VizieR/J/MNRAS/451/2263doi:10.26093/cds/vizier.74512263CDSZhou G.Bayliss D.Hartman J.D.Rabus M.Bakos G.A.Jordan A.,Brahm R.Penev K.Csubry Z.Mancini L.Espinoza N.de Val-Borro M.,Bhatti W.Ciceri S.Henning T.Schmidt B.Murphy S.J.Butler R.P.,Arriagada P.Shectman S.Crane J.Thompson I.Suc V.Noyes R.W.2024-08-14T20:22:14Z2017-12-18T12:28:37ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsdwarf-starsm-starsvisible-astronomysloan-photometryWe report the discovery and characterization of a new M-dwarf binary, with component masses and radii of M_1_=0.244_-0.003_^+0.003^M_{sun}_, R_1_=0.261_-0.009_^+0.006^R_{sun}_, M_2_=0.179_-0.001_^+0.002^M_{sun}_, R_2_=0.218_-0.011_^+0.007^R_{sun}_, and orbital period of ~4.1 d. The M-dwarf binary HATS551-027 (LP 837-20) was identified as an eclipsing binary by the HATSouth survey, and characterized by a series of high-precision photometric observations of the eclipse events, and spectroscopic determinations of the atmospheric parameters and radial velocity orbits. HATS551-027 is one of few systems with both stellar components lying in the fully convective regime of very low mass stars, and can serve as a test for stellar interior models. The radius of HATS551-027A is consistent with models to 1{sigma}, whilst HATS551-027B is inflated by 9 percent at 2{sigma} significance. We measure the effective temperatures for the two stellar components to be T_eff,1_=3190+/-100K and T_eff,2_=2990+/-110K; both are slightly cooler than theoretical models predict, but consistent with other M-dwarfs of similar masses that have previously been studied. We also measure significant H{alpha} emission from both components of the binary system, and discuss this in the context of the correlation between stellar activity and the discrepancies between the observed and model temperatures.2015MNRAS.451.2263Zhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/451/2263CatalogResearchIsServedByTAP VizieR generic servicerelated-toV/118 : Catalog of eclipsing binaries parameters (Perevozkina+, 1999)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/451/2263https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/451/2263http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/451/2263https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/451/2263https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/451/2263http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/451/2263GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/MNRAS/451/2263/table2HATS551-027 differential photometryFluxFlux in filterphot.fluxdoublee_FluxUncertainty in Fluxstat.error;phot.fluxdoubleInstInstrument (HATSouth, FTS, SWOPE) (1)meta.id;instrcharFilt[r'i'] Filtermeta.id;instr.filtercharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric Julian Datedtime.epochdouble