J/AJ/161/202ivo://CDS.VizieR/J/AJ/161/202doi:10.26093/cds/vizier.51610202CDSLiang Y.Robnik J.Seljak U.2021-12-08T20:04:56Z2021-09-07T07:32:34ZCDS support team

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

cds-question@unistra.frexoplanetsmultiple-starsExoplanet transit-timing variations (TTVs) caused by gravitational forces between planets can be used to determine planetary masses and orbital parameters. Most of the observed TTVs are small and sinusoidal in time, leading to degeneracies between the masses and orbital parameters. Here we report a TTV analysis of Kepler-90g and Kepler-90h, which exhibit large TTVs up to 25hr. With optimization, we find a unique solution that allows us to constrain all of the orbital parameters. The best-fit masses for Kepler-90g and 90h are 15.0_-0.8_^+0.9^M{Earth} (Earth mass) and 203_-5_^+5^M_{Earth}, respectively, with Kepler-90g having an unusually low apparent density of 0.15{+/-}0.05g/cm^3^. The uniqueness of orbital parameter solution enables a long-term dynamical integration, which reveals that although their periods are close to 2:3 orbital resonance, they are not locked in resonance, and the configuration is stable over billions of years. The dynamical history of the system suggests that planet interactions are able to raise the eccentricities and break the resonant lock after the initial formation.2021AJ....161..202Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/161/202CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/790/146 : Planets in Kepler's multi-transiting systems (Fabrycky+, 2014)J/ApJ/785/15 : Transit times Kepler-79's known planets (Jontof-Hutter+, 2014)J/ApJS/225/9 : Kepler TTVs IX. The full long-cadence data set (Holczer+, 2016)J/A+A/587/A64 : Physical properties of giant exoplanets (Santerne+, 2016)J/AJ/154/5 : Transit timing variations of 145 Kepler planets (Hadden+, 2017)J/ApJS/234/9 : A spectral approach to transit timing variations (Ofir+, 2018)J/AJ/156/89 : RVs & predicted transit-times for K2-24 system (Petigura+,2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/161/202https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/161/202http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/161/202https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/161/202https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/161/202http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/161/202GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/161/202/fig1 (Raw transit timings and durations of Kepler 90g & h)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/161/202/fig1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/161/202/fig1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/161/202/fig1?GETtext/xml+votable180.050000true284.433493149.30513780.0055555555555555566/15150https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/161/202?format=asciidefaultJ/AJ/161/202/fig1Raw transit timings and durations of Kepler 90g & hSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintPlanetPlanet observedmeta.id;meta.maincharHJD[140/1467] Absolute transit time; HJD-2454833dtime.epochdoublee_HJD[0.001/0.003] Error in HJDdstat.error;time.epochdoubleDur[0.47/0.59] Transit Durationdtime.durationdoublee_Dur[0.001/0.006] Error in Durdstat.errordouble_RAPosition from SIMBAD (right ascension part)degpos.eq.ra;meta.mainnullable_DEPosition from SIMBAD (declination part)degpos.eq.dec;meta.mainnullable