J/ApJ/768/L12ivo://CDS.VizieR/J/ApJ/768/L12doi:10.26093/cds/vizier.17689012CDSTeske J.K.Schuler S.C.Cunha K.Smith V.V.Griffith C.A.2019-05-08T15:40:10Z2015-01-08T11:46:58ZCDS support team

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

cds-question@unistra.frchemical-abundancesline-intensitiesmultiple-starssolar-system-planetsWith the aim of connecting the compositions of stars and planets, we present the abundances of carbon and oxygen, as well as iron and nickel, for the transiting exoplanet host star XO-2N and its wide-separation binary companion XO-2S. Stellar parameters are derived from high-resolution, high signal-to-noise spectra, and the two stars are found to be similar in their T_eff_, log g, iron ([Fe/H]), and nickel ([Ni/H]) abundances. Their carbon ([C/H]) and oxygen ([O/H]) abundances also overlap within errors, although XO-2N may be slightly more C-rich and O-rich than XO-2S. The C/O ratios of both stars (~0.60+/-0.20) may also be somewhat larger than solar (C/O~0.50). The XO-2 system has a transiting hot Jupiter orbiting one binary component but not the other, allowing us to probe the potential effects planet formation might have on the host star composition. Additionally, with multiple observations of its atmosphere the transiting exoplanet XO-2b lends itself to compositional analysis, which can be compared to the natal chemical environment established by our binary star elemental abundances. This work sets the stage for determining how similar or different exoplanet and host star compositions are, and the implications for planet formation, by discussing the C/O ratio measurements in the unique environment of a visual binary system with one star hosting a transiting hot Jupiter.2013ApJ...768L..12Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/768/L12CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/146/76 : Astrometry and phot. of UCAC4 double stars (Hartkopf+, 2013)J/other/Nat/486.375 : Stellar parameters of KOI stars (Buchhave+, 2012)J/ApJ/757/161 : Spectroscopy of 56 exoplanet host stars (Torres+, 2012)J/ApJ/737/L32 : Abundances of 16 Cyg A and B (Schuler+, 2011)J/ApJ/735/41 : Carbon and oxygen abundances in FGK stars (Petigura+, 2011)J/ApJ/732/55 : Abundances of stars with planets (Schuler+, 2011)J/ApJ/725/2349 : C/O vs Mg/Si of planetary systems (Delgado Mena+, 2010)J/ApJ/720/1592 : Abundances of solar analogs with planets (Hernandez+, 2010)J/ApJ/720/1290 : Abundances of stars hosting planets (Ghezzi+, 2010)J/ApJ/715/1050 : Predicted abundances for extrasolar planets. I. (Bond+, 2010)J/A+A/508/L17 : Abundances in solar analogs (Ramirez+, 2009)J/PASJ/57/65 : CNO abundances of solar-type stars (Takeda+, 2005)J/ApJ/622/1102 : The planet-metallicity correlation. (Fischer+, 2005)J/A+A/415/1153 : [Fe/H] for 98 extra-solar planet-host stars (Santos+, 2004)J/A+A/402/343 : IR OI triplet, [O I] lines in F-K dwarfs/giants (Takeda, 2003)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/768/L12https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/768/L12http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/768/L12https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/768/L12https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/768/L12http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/768/L12GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/768/L12/stars (Derived stellar parameters (from table2))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/768/L12/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/768/L12/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/768/L12/stars?GETtext/xml+votable180.050000true117.031172550.21757170.0055555555555555566/6638https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/768/L12?format=asciidefaultJ/ApJ/768/L12/starsDerived stellar parameters (from table2)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.maincharTeff[5343/5547] Effective temperatureKphys.temperature.effectiveinte_TeffTeff uncertaintyKstat.error;phys.temperature.effectiveintTeff2Effective temperature from B07 (1)Kphys.temperature.effectiveinte_Teff2Teff2 uncertainty (1)Kstat.errorintlogg[4.2/4.5] Log of surface gravitylog(cm.s**-2)phys.gravityfloate_logglogg uncertaintylog(cm.s**-2)stat.errorfloatlogg2Surface gravity from B07 (1)log(cm.s**-2)phys.gravityfloate_logg2logg2 uncertainty (1)log(cm.s**-2)stat.errorfloatVt[1.2/1.3] Turbulent velocitykm/sphys.veloc.microTurbfloate_Vt[0.07/0.09] Vt uncertaintykm/sstat.errorfloat[Fe/H][0.2/0.4] Metallicitylog(Sun)phys.abundfloate_[Fe/H]Uncertainty of [Fe/H]log(Sun)phys.abundfloat[Fe/H]2Abundance of [Fe/H] from B07 (1)log(Sun)phys.abundfloate_[Fe/H]2Uncertainty of [Fe/H]2 (1)log(Sun)phys.abundfloat[C/H][0.2/0.5] Abundance of [C/H]log(Sun)phys.abundfloate_[C/H]Uncertainty of [C/H]log(Sun)phys.abundfloat[Ni/H][0.3/0.5] Abundance of [Ni/H]log(Sun)phys.abundfloate_[Ni/H]Uncertainty of [Ni/H]log(Sun)phys.abundfloat[Ni/H]2Abundance of [Ni/H] from B07 (1)log(Sun)phys.abundfloate_[Ni/H]2Uncertainty of [Ni/H]2 (1)log(Sun)phys.abundfloat[O/H][0.1/0.4] Abundance of [O/H]log(Sun)phys.abundfloate_[O/H]Uncertainty of [O/H]log(Sun)phys.abundfloatC/O[0.6] C/O abundance ratiolog(Sun)phys.abund;arith.ratiofloate_C/OC/O uncertaintylog(Sun)stat.error;phys.abundfloatEWDisplay the Equivalent Widths from table1meta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlchar_RAPositions from SIMBAD database (right ascension part)degpos.eq.ra;meta.main_DEPositions from SIMBAD database (declination part)degpos.eq.dec;meta.mainJ/ApJ/768/L12/table1Lines measured, equivalent widths, and abundancesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIonIonphys.atmol.ionStagecharlambda[4620.5/7114.6] Wavelength in Angstroms0.1nmem.wlfloatExPot[0/7.7] Excitation potentialeVphys.atmol.excitationfloatlog(gf)[-9.8/-0.2] Log of the oscillator strengthphys.atmol.oscStrengthfloatEWSEquivalent width in the solar spectrum (2)(1)1e-13mspect.line.eqWidthfloatlogNSLog of solar number abundance (2)phys.abundfloatEWXO-2S? Equivalent width in the XO-2S spectrum (1)1e-13mspect.line.eqWidthfloatnullablelogNXO-2S? Log of XO-2S number abundancephys.abundfloatnullableEWXO-2N? Equivalent width in the XO-2N spectrum (1)1e-13mspect.line.eqWidthfloatnullablelogNXO-2N? Log of XO-2N number abundancephys.abundfloatnullable