J/A+A/710/A394ivo://CDS.VizieR/J/A+A/710/A394CDSMarcadon F.Moharana A.Pawar T.B.Pawar G.Helminiak K.G.,Marques J.P.Konacki M.2026-07-01T07:45:26Z2026-07-01T08:45:07ZCDS support team

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

cds-question@unistra.freclipsing-binary-starsspectroscopic-binary-starspre-main-sequence-starsWe report the discovery of a new short-period pre-main-sequence eclipsing binary, RX Gru, orbited by a distant circumbinary companion. We characterized the system by analysing the photometric observations from the Solaris network, the Transiting Exoplanet Survey Satellite, and the Super Wide Angle Search for Planets survey, combined with the radial velocities from four high-resolution spectrographs: HARPS, FEROS, CHIRON, and HRS. We determined the age of the system from the observed parameters using two evolution codes, MESA and Cesam2k20. We obtained an age of ~28Myr, placing the two stars at the very end of the pre-main-sequence phase. We conclude that RX Gru consists of a tight inner binary composed of two twin components and an outer low-mass companion (a massive brown dwarf or a very low-mass star) in a relatively wide orbit, and we suggest that the system was formed via the dynamical unfolding mechanism coupled with the shared accretion of the circumbinary material by the binary components.2026A&A...710A.394Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/710/A394CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/710/A394https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/710/A394http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/710/A394https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/710/A394https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/710/A394http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/710/A394GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/710/A394/tableb1Times of minima of RX GrurecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTimeTime of minima (BJD-2430000)dtime.epochdoubleCycleCycle number (1)meta.id;meta.mainfloate_Time1{sigma} timing uncertaintydstat.error;time.epochdoubleDobsDobsstime;arith.difffloatO-CETV residualsstat.fit.residualfloatSurveySurvey, SWASP, Solaris, TESS S01 or TESS S28meta.notechar