J/A+A/564/A33ivo://CDS.VizieR/J/A+A/564/A33doi:10.26093/cds/vizier.35640033CDSIoannidis P.Schmitt J.H.M.M.Avdellidou Ch.von Essen C.Agol E.2017-12-12T14:45:12Z2014-04-01T09:01:00ZCDS support team

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

cds-question@unistra.frmultiple-starssolar-system-planetsWe report the detection and characterization of two short-period, Neptune-sized planets around the active host star Kepler-210. The host star's parameters derived from those planets are (a) mutually inconsistent and (b) do not conform to the expected host star parameters. We furthermore report the detection of transit timing variations (TTVs) in the O-C diagrams for both planets. We explore various scenarios that explain and resolve those discrepancies. A simple scenario consistent with all data appears to be one that attributes substantial eccentricities to the inner short-period planets and that interprets the TTVs as due to the action of another, somewhat longer period planet. To substantiate our suggestions, we present the results of N-body simulations that modeled the TTVs and that checked the stability of the Kepler-210 system.2014A&A...564A..33Ihttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/564/A33CatalogResearchIsServedByTAP VizieR generic servicerelated-toV/133 : Kepler Input Catalog (Kepler Mission Team, 2009)J/AJ/142/19 : Speckle observations of KOI (Howell+, 2011)J/ApJ/736/19 : Kepler planetary candidates. II. (Borucki+, 2011)J/ApJS/197/2 : Transit timing observations from Kepler. I. (Ford+, 2011)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/564/A33https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/564/A33http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/564/A33https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/564/A33https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/564/A33http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/564/A33GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/564/A33/tt_bMid-transit times for planet brecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintttSimbad column added by the CDSmeta.idcharEp[1/466] Epochdmeta.number;time.periodintNObservations for this transit (1 or 2)meta.numberintnullableTr.OObserved mid-transit Barycentric Julian Date (JD-2454833)dtime.epochdoublee_Tr.O[0.0007/0.0013] Error of mid-transit timedstat.errordoubleTr.CEphemeris mid-transit Barycentric Julian Date (JD-2454833)dtime.epochdoubleJ/A+A/564/A33/tt_cMid-transit times for planet crecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintttSimbad column added by the CDSmeta.idcharEp[1/466] Epochdmeta.number;time.periodintNObservations for this transit (1 or 2)meta.numberintnullableTr.OObserved mid-transit Barycentric Julian Date (JD-2454833)dtime.epochdoublee_Tr.O[0.0007/0.0013] Error of mid-transit timedstat.errordoubleTr.CEphemeris mid-transit Barycentric Julian Date (JD-2454833)dtime.epochdouble