J/ApJ/824/15ivo://CDS.VizieR/J/ApJ/824/15doi:10.26093/cds/vizier.18240015CDSVan Eylen V.Winn J.N.Albrecht S.2017-07-05T06:59:47Z2016-09-26T08:48:59ZCDS support team

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

cds-question@unistra.freclipsing-binary-starseffective-temperatureThe rate of tidal circularization is predicted to be faster for relatively cool stars with convective outer layers, compared to hotter stars with radiative outer layers. Observing this effect is challenging because it requires large and well-characterized samples that include both hot and cool stars. Here we seek evidence of the predicted dependence of circularization upon stellar type, using a sample of 945 eclipsing binaries observed by Kepler. This sample complements earlier studies of this effect, which employed smaller samples of better-characterized stars. For each Kepler binary we measure e.cos.{omega} based on the relative timing of the primary and secondary eclipses. We examine the distribution of e.cos.{omega} as a function of period for binaries composed of hot stars, cool stars, and mixtures of the two types. At the shortest periods, hot-hot binaries are most likely to be eccentric; for periods shorter than four days, significant eccentricities occur frequently for hot-hot binaries, but not for hot-cool or cool-cool binaries. This is in qualitative agreement with theoretical expectations based on the slower dissipation rates of hot stars. However, the interpretation of our results is complicated by the largely unknown ages and evolutionary states of the stars in our sample.2016ApJ...824...15Vhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/824/15CatalogResearchIsServedByTAP VizieR generic servicerelated-toV/133 : Kepler Input Catalog (Kepler Mission Team, 2009)J/MNRAS/437/3473 : Temperatures of Kepler eclipsing binaries (Armstrong+, 2014)J/ApJ/757/18 : RVs for 16 hot Jupiter host stars (Albrecht+, 2012)J/AJ/142/160 : Kepler Mission. II. eclipsing binaries (Slawson+, 2011)J/AJ/141/83 : Eclipsing binaries in Kepler DR1 (Prsa+, 2011)J/AJ/141/78 : Low-mass eclipsing binaries in KIC (Coughlin+, 2011)J/other/A+ARV/18.67 : Accurate masses and radii of normal stars (Torres+, 2010)J/MNRAS/401/257 : Early-type binaries on main sequence (Khaliullin+, 2010)J/A+A/450/681 : Companions to close spectroscopic bin. (Tokovinin+, 2006)http://keplerebs.villanova.edu/ : Kepler eclipsing binaries online cataloghttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/824/15https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/824/15http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/824/15https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/824/15https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/824/15http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/824/15GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/ApJ/824/15/table1System parameters for Kepler eclipsing binaries with measured e.cos({omega}) valuesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintKICKepler Input Catalog identifiermeta.id;meta.mainintPer[1.5/50] Perioddtime.perioddoubleHJD[5500.4/55733.8] Heliocentric Julian Date (1)dtime.epochdoubleTeff1[3510/26640] Primary effective temperatureKphys.temperature.effectiveinte_Teff1[350/13408] Uncertainty in Teff1Kstat.errorintTeff2[3516/26819] Secondary effective temperatureKphys.temperature.effectiveinte_Teff2[540/13410] Uncertainty in Teff2Kstat.errorintecos(w)[-0.72/0.7] Eccentricity and cosine of argument of pericenter (2)src.orbital.eccentricityfloate_ecos(w)[0.0002/0.3] Uncertainty in ecos(w)stat.errorfloatKCatDisplay data from Slawson+, 2011, J/AJ/142/160 and Armstrong+, 2014, J/MNRAS/437/3473meta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlchar