J/MNRAS/460/3706ivo://CDS.VizieR/J/MNRAS/460/3706doi:10.26093/cds/vizier.74603706CDSRamm D.J.Nelson B.E.Endl M.Hearnshaw J.B.Wittenmyer R.A.Gunn F.,Bergmann C.Kilmartin P.Brogt E.2024-08-16T20:17:28Z2017-12-19T15:35:49ZCDS support team

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

cds-question@unistra.frspectroscopic-binary-starsradial-velocityWe report 1212 radial-velocity (RV) measurements obtained in the years 2009-2013 using an iodine cell for the spectroscopic binary {nu} Octantis (K1 III/IV). This system (a_bin_~2.6au, P~1050d) is conjectured to have a Jovian planet with a semimajor axis half that of the binary host. The extreme geometry only permits long-term stability if the planet is in a retrograde orbit. Whilst the reality of the planet (P~415d) remains uncertain, other scenarios (stellar variability or apsidal motion caused by a yet unobserved third star) continue to appear substantially less credible based on cross-correlation function bisectors, line-depth ratios and many other independent details. If this evidence is validated but the planet is disproved, the claims of other planets using RVs will be seriously challenged. We also describe a significant revision to the previously published RVs and the full set of 1437 RVs now encompasses nearly 13 yr. The sensitive orbital dynamics allow us to constrain the 3D architecture with a broad prior probability distribution on the mutual inclination, which with posterior samples obtained from an N-body Markov chain Monte Carlo is found to be 152.5^+0.7^_-0.6_{deg}. None of these samples are dynamically stable beyond 10^6^yr. However, a grid search around the best-fitting solution finds a region that has many models stable for 10^7^yr, and includes one model within 1{sigma} that is stable for at least 10^8^yr. The planet's exceptional nature demands robust independent verification and makes the theoretical understanding of its formation a worthy challenge.2016MNRAS.460.3706Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/460/3706CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/460/3706https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/460/3706http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/460/3706https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/460/3706https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/460/3706http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/460/3706GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/MNRAS/460/3706/table3List of the 1180 austral-processed I2 spectra acquired during 2009-2013 using the 4kx4k CCDrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJDBarycentric-corrected Julian date (JD-2450000)dtime.epochdoubleVI2Corrected I2 relative radial velocitykm/sphys.veloc;pos.heliocentricfloate_VI2Internal error on VI2 ({sigma}_i_)m/sstat.errorfloatbary.corrBarycentric correctionkm/sphys.veloc;arith.diffdoubleS/NSignal-to-noise ration in order n=110stat.snrintJ/MNRAS/460/3706/table4List of the relative velocity data of 32 4kx4k detector observations acquired 2006-2013 using CCF fittingrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJDBarycentric-corrected Julian date (JD-2450000)dtime.epochdoubleVI2Corrected I2 relative radial velocitykm/sphys.veloc;pos.heliocentricfloate_VI2Internal error on VI2 ({sigma}_i_)m/sstat.errorfloatbary.corrBarycentric correctionkm/sphys.veloc;arith.diffdoubleS/NSignal-to-noise ration in order n=110stat.snrintJ/MNRAS/460/3706/table5List of the 225 spectra acquired during 2001-2007 using the 1kx1k CCDrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJDBarycentric-corrected Julian date (JD-2450000)dtime.epochdoubleVI2Corrected I2 relative radial velocitykm/sphys.veloc;pos.heliocentricfloate_VI2Internal error on VI2 ({sigma}_i_)m/sstat.errorfloatbary.corrBarycentric correctionkm/sphys.veloc;arith.diffdoubleS/NSignal-to-noise ration in order n=110stat.snrint