J/AJ/158/100ivo://CDS.VizieR/J/AJ/158/100doi:10.26093/cds/vizier.51580100CDSHorner J.Wittenmyer R.A.Wright D.J.Hinse T.C.Marshall J.P.,Kane S.R.Clark J.T.Mengel M.Agnew M.T.Johns D.2019-10-21T12:33:56Z2019-10-21T13:31:45ZCDS support team

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

cds-question@unistra.frk-starsradial-velocityexoplanetsWe present a detailed analysis of the orbital stability of the HD 181433 planetary system, finding it to exhibit strong dynamical instability across a wide range of orbital eccentricities, semimajor axes, and mutual inclinations. We also analyze the behavior of an alternative system architecture, proposed by Campanella, and find that it offers greater stability than the original solution, as a result of the planets being trapped in strong mutual resonance. We take advantage of more recent observations to perform a full refit of the system, producing a new planetary solution. The best-fit orbit for HD 181433 d now places the planet at a semimajor axis of 6.60+/-0.22 au, with an eccentricity of 0.469+/-0.013. Extensive simulations of this new system architecture reveal it to be dynamically stable across a broad range of potential orbital parameter space, increasing our confidence that the new solution represents the ground truth of the system. Our work highlights the advantage of performing dynamical simulations of candidate planetary systems in concert with the orbital fitting process, as well as supporting the continuing monitoring of radial velocity planet search targets.2019AJ....158..100Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/158/100CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/496/527 : Radial velocity curves of HD 47186 and HD 181433https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/158/100https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/158/100http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/158/100https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/158/100https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/158/100http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/158/100GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/AJ/158/100/table5HARPS radial velocities for HD 181433recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJD[52942.5/57971.6] Barycentric Julian Date (BJD-2400000)dtime.epochdoubleRV[-26.51/29.4] Radial velocitym/sphys.veloc;pos.heliocentricfloate_RV[0.23/2.52] Uncertainty in RVm/sstat.errorfloat