J/ApJ/801/L10ivo://CDS.VizieR/J/ApJ/801/L10doi:10.26093/cds/vizier.18019010CDSTeske J.K.Ghezzi L.Cunha K.Smith V.V.Schuler S.C.Bergemann M.2017-11-10T11:15:06Z2015-08-07T15:05:33ZCDS support team

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

cds-question@unistra.frmultiple-starsline-intensitiesThe chemical composition of exoplanet host stars is an important factor in understanding the formation and characteristics of their orbiting planets. The best example of this to date is the planet-metallicity correlation. Other proposed correlations are thus far less robust, in part due to uncertainty in the chemical history of stars pre- and post-planet formation. Binary host stars of similar type present an opportunity to isolate the effects of planets on host star abundances. Here we present a differential elemental abundance analysis of the XO-2 stellar binary, in which both G9 stars host giant planets, one of which is transiting. Building on our previous work, we report 16 elemental abundances and compare the {Delta}(XO-2N-XO-2S) values to elemental condensation temperatures. The {Delta}(N-S) values and slopes with condensation temperature resulting from four different pairs of stellar parameters are compared to explore the effects of changing the relative temperature and gravity of the stars. We find that most of the abundance differences between the stars depend on the chosen stellar parameters, but that Fe, Si, and potentially Ni are consistently enhanced in XO-2N regardless of the chosen stellar parameters. This study emphasizes the power of binary host star abundance analysis for probing the effects of giant planet formation, but also illustrates the potentially large uncertainties in abundance differences and slopes induced by changes in stellar temperature and gravity.2015ApJ...801L..10Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/801/L10CatalogResearchIsServedByTAP VizieR generic servicerelated-toV/136 : Teff and metallicities for Tycho-2 stars (Ammons+, 2006)J/A+A/575/A111 : GAPS V: Global analysis of the XO-2 system (Damasso+, 2015)J/A+A/564/A133 : Gaia FGK benchmark stars: metallicity (Jofre+, 2014)J/A+A/561/A7 : Abundances for stars with planets (Ramirez+, 2014)J/A+A/558/A106 : Chemical abundances for 83 transit hosts (Mortier+, 2013)J/ApJ/770/36 : APOSTLE transits of XO-2 system (Kundurthy+, 2013)J/ApJ/768/L12 : Abundances in host stars XO-2S and XO-2N (Teske+, 2013)J/ApJ/757/161 : Spectroscopy of 56 exoplanet host stars (Torres+, 2012)J/ApJ/732/55 : Abundances of stars with planets (Schuler+, 2011)J/ApJ/720/1290 : Abundances of stars hosting planets (Ghezzi+, 2010)J/AJ/137/4911 : Six transits of the exoplanet XO-2b (Fernandez+, 2009)J/A+A/487/373 : Spectroscopic parameters of 451 HARPS-GTO stars (Sousa+, 2008)J/A+A/469/783 : Code for automatic determination of EW (ARES) (Sousa+, 2007)J/A+A/454/581 : Iron abundances of 33 wide binaries (Desidera+, 2006)J/ApJ/622/1102 : The planet-metallicity correlation. (Fischer+, 2005)J/A+A/420/683 : Equivalent widths of 23 wide binaries (Desidera+, 2004)J/A+A/415/1153 : [Fe/H] for 98 extra-solar planet-host stars (Santos+, 2004)J/A+A/377/123 : Equivalent widths of 6 binaries (Gratton+, 2001)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/801/L10https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/801/L10http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/801/L10https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/801/L10https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/801/L10http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/801/L10GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/ApJ/801/L10/table1Derived stellar parameters and {Delta}(N-S) abundancesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintParam"Orig" or "Alt" setmeta.idcharSet? Set number for "Alt" params (1)meta.id;meta.mainintnullableNameStar name (XO-2N or XO-2S)meta.idcharTeff[5343/5547] Effective temperatureKphys.temperature.effectiveinte_Teff[32/78] Teff uncertaintyKstat.error;phys.temperature.effectiveintlogg[4.2/4.5] Log of surface gravitylog(cm.s**-2)phys.gravityfloate_logg[0.08/0.3] logg uncertaintylog(cm.s**-2)stat.errorfloatxi[1/1.4] Microturbulent velocity {xi}km/sphys.velocfloate_xi[0.05/0.2] xi uncertaintykm/sstat.errorfloat[Fe/H][0.2/0.5] Metallicityphys.abund.Zfloate_[Fe/H][0.04/0.2] [Fe/H] uncertaintystat.error;phys.abund.FefloatN1[23/72] Number of FeI lines measuredmeta.numberintN2[8/10] Number of FeII lines measuredmeta.numberintSol?[yes no] Relative to solar?meta.codecharIRAF?[IRAF ARES] IRAF/ARES reductionmeta.notecharEWDisplay the equivalent widthd (table 2)meta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlcharJ/ApJ/801/L10/table2Lines and equivalent widths measuredrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIonIon designationphys.atmol.ionStagecharlambda[4465.8/7114.6] Wavelength, in Angstroms0.1nmem.wlfloatExPot[0/8] Excitation potentialeVphys.atmol.excitationfloatlog(gf)[-9.8/0.6] Log of oscillator strengthphys.atmol.oscStrengthfloatEW0[4/123]? Solar equivalent width (m{AA})1e-13mspect.line.eqWidthfloatnullableEW2S[11/170]? XO-2S equivalent width (m{AA})1e-13mspect.line.eqWidthfloatnullablef_EW2S[a-d] Flag on XO-2S (1) (for TiI only)meta.codechardA2S[0.03/0.1]? NLTE abundance correction for XO-2Sarith.factorfloatnullableEW2N[8.2/176.3]? XO-2N equivalent width (m{AA})1e-13mspect.line.eqWidthfloatnullablef_EW2N[b-d] Flag on XO2N (1) (for TiI only)meta.codechardA2N[0.02/0.1]? NLTE abundance correction for XO-2Narith.factorfloatnullable