J/A+A/630/A50ivo://CDS.VizieR/J/A+A/630/A50doi:10.26093/cds/vizier.36300050CDSBoehle A.Quanz S.P.Lovis C.Segransan D.Udry S.Apai D.2019-09-24T07:57:55Z2019-09-23T08:35:14ZCDS support team

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

cds-question@unistra.frradial-velocityNearby stars are prime targets for exoplanet searches and characterization using a variety of detection techniques. Combining constraints from the complementary detection methods of high-contrast imaging (HCI) and radial velocity (RV) can further constrain the planetary architectures of these systems because these methods place limits at different regions of the companion mass and semi-major axis parameter space. Compiling a census of the planet population in the solar neighborhood is important to inform target lists for future space missions that will specifically target nearby stars to search for Earth analogs. We aim to constrain the planetary architectures from the combination of HCI and RV data for six nearby stars within 6pc: tau Ceti, Kapteyn;s star, AX Mic, 40 Eri, HD 36395, and HD 42581. We explored where HCI adds information to constraints from the long-term RV monitoring data for these stars. We compiled the sample from stars with available archival VLT/NACO HCI data at L' band (3.8um), where we expect substellar companions to be brighter for the typically older ages of nearby field stars (>1Gyr). The NACO data were fully reanalyzed using the state-of-the-art direct imaging pipeline PynPoint and combined with RV data from HARPS, Keck/HIRES, and CORALIE. A Monte Carlo approach was used to assess the completeness in the companion mass and semi-major axis parameter space from the combination of the HCI and RV data sets. We find that the HCI data add significant information to the RV constraints, increasing the completeness for certain companions masses and semi-major axes by up to 68-99% for four of the six stars in our sample, and by up to 1-13% for the remaining stars. The improvements are strongest for intermediate semi-major axes (15-40AU), corresponding to the semi-major axes of the ice giants in our own solar system. The HCI mass limits reach 5-20M_Jup_ in the background-limited regime, depending on the age of the star. Through the combination of HCI and RV data, we find that stringent constraints can be placed on the possible substellar companions in these systems. Applying these methods systematically to nearby stars will quantify our current knowledge of the planet population in the solar neighborhood and inform future observations.2019A&A...630A..50Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/630/A50CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/630/A50https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/630/A50http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/630/A50https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/630/A50https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/630/A50http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/630/A50GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/630/A50/stars (List of studied stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/630/A50/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/630/A50/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/630/A50/stars?GETtext/xml+votable180.050000true63.818-7.65286110.0055555555555555566/17425 20896 22708 22807 34181 46776https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/630/A50?format=asciidefaultJ/A+A/630/A50/starsList of studied starsNameStar namemeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Simbad Hour of Right Ascension (J2000.0)pos.eq.ra;meta.mainDEJ2000Simbad Degree of Declination (J2000.0)pos.eq.dec;meta.mainNobsNumber of radial velocity measurements in table.datmeta.numberintVCShow the Radial Velocity curvesmeta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlcharJ/A+A/630/A50/tableRadial velocitiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.maincharMJDMJD date of radial velocity data pointdtime.epochdoubleRVCalibrated radial velocitym/sphys.veloc;pos.heliocentricdoublee_RVError in RVm/sstat.errordoubleInstInstrument used for RV measurement (1)instr.setupchar