J/AJ/165/252ivo://CDS.VizieR/J/AJ/165/252doi:10.26093/cds/vizier/be-55-7wCDSKane S.R.Hill M.L.Dalba P.A.Fetherolf T.Henry G.W.,Fajardo-Acosta S.B.Gnilka C.L.Howard A.W.Howell S.B.Isaacson H.2026-07-02T11:44:29Z2023-10-27T06:51:02ZCDS support team

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

cds-question@unistra.frexoplanetshigh-velocity-starsvisible-astronomyspectroscopyradial-velocityFrom the thousands of known exoplanets, those that transit bright host stars provide the greatest accessibility toward detailed system characterization. The first known such planets were generally discovered using the radial velocity technique, then later found to transit. HD17156b is particularly notable among these initial discoveries because it diverged from the typical hot-Jupiter population, occupying a 21.2day eccentric (e=0.68) orbit, offering preliminary insights into the evolution of planets in extreme orbits. Here we present new data for this system, including ground- and space-based photometry, radial velocities, and speckle imaging, that further constrain the system properties and stellar/planetary multiplicity. These data include photometry from the Transiting Exoplanet Survey Satellite that cover five transits of the known planet. We show that the system does not harbor any additional giant planets interior to 10au. The lack of stellar companions and the age of the system indicate that the eccentricity of the known planet may have resulted from a previous planet-planet scattering event. We provide the results from dynamical simulations that suggest possible properties of an additional planet that culminated in ejection from the system, leaving a legacy of the observed high eccentricity for HD17156b.2023AJ....165..252Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/165/252CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/375/L27 : HD80606b, planet on an extremely elongated orbit (Naef+ 2001)J/A+A/485/871 : Transiting planet HD 17156b (Gillon+, 2008)J/A+A/503/601 : HD17156 transit photometry & radial velocity (Barbieri+, 2009)J/ApJ/693/794 : Transit of exoplanet HD 17156b (Winn+, 2009)J/AJ/142/19 : Speckle observations of KOI (Howell+, 2011)J/ApJ/754/37 : HD 192263 radial velocities and photometry (Dragomir+, 2012)J/ApJ/844/102 : KIC star parallaxes from asteroseismology/Gaia (Huber+, 2017)J/A+A/605/A72 : Planetary systems AMD-stability (Laskar+, 2017)J/A+A/614/A138 : HD 80606/80607 equivalent widths (Lui+, 2018)J/AJ/160/129 : HARPS, HIRES and AAT Radial Velocities HD136352 (Kane+, 2020)J/ApJS/259/62 : TESS transit timing of hot Jupiters (Ivshina+, 2022)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/165/252https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/165/252http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/165/252https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/165/252https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/165/252http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/165/252GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/AJ/165/252/table2HD 17156 radial velocitiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJD[2453746/2459858] Barycentric Julian Datedtime.epochdoubleRVel[-365/168] Radial velocitym/sspect.dopplerVelocdoublee_RVel[1/2] Uncertainty in RVelm/sstat.error;spect.dopplerVelocfloat