J/A+A/558/A71ivo://CDS.VizieR/J/A+A/558/A71doi:10.26093/cds/vizier.35580071CDSLohr M.E.Norton A.J.Kolb U.C.Boyd D.R.S.2014-03-29T17:26:48Z2013-10-04T12:40:19ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsvariable-starsephemeridesWe report our investigation of 1SWASP J234401.81-212229.1, a variable with a 18461.6s period. After identification in a 2011 search of the SuperWASP archive for main-sequence eclipsing binary candidates near the distribution's short-period limit of ~0.20d, it was measured to be undergoing rapid period decrease in our earlier work, though later observations supported a cyclic variation in period length. Spectroscopic data obtained in 2012 with the Southern African Large Telescope did not, however, support the interpretation of the object as a normal eclipsing binary. Here, we consider three possible explanations consistent with the data: a single-star oblique rotator model in which variability results from stable cool spots on opposite magnetic poles; a two-star model in which the secondary is a brown dwarf; and a three-star model involving a low-mass eclipsing binary in a hierarchical triple system. We conclude that the latter is the most likely model.2013A&A...558A..71Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/558/A71CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/558/A71https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/558/A71http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/558/A71https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/558/A71https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/558/A71http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/558/A71GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/558/A71/minimaTimes of minimarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintE[-2461/8793] Cycle number (epoch) of minimummeta.id;meta.mainintHJDHeliocentric Julian date of minimumdtime.epochdoublee_HJDUncertainty in time of minimumdstat.error;time.epochdouble