J/A+A/655/A99ivo://CDS.VizieR/J/A+A/655/A99doi:10.26093/cds/vizier.36550099CDSDelgado Mena E.Adibekyan V.Zh.Santos N.C.Tsantaki M.,Gonzalez Hernandez J.I.Sousa S.G.Bertran de Lis S.2022-09-21T09:33:59Z2021-11-26T12:47:24ZCDS support team

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

cds-question@unistra.frmilky-way-galaxyexoplanetschemical-abundancesTo understand the formation and composition of planetary systems, it is essential to have insights into the chemical composition of their host stars. In particular, C/O elemental ratios are useful for constraining the density and bulk composition of terrestrial planets. We study the carbon abundances with a twofold objective. On the one hand, we want to evaluate the behaviour of carbon in the context of Galactic chemical evolution. On the other hand, we focus on the possible dependence of carbon abundances on the presence of planets and on the impact of various factors (such as different oxygen lines) on the determination of C/O elemental ratios. We derived chemical abundances of carbon from two atomic lines for 757 FGK stars in the HARPS-GTO sample, observed with high-resolution (R~115000) and high-quality spectra. The abundances were derived using a standard Local Thermodinamyc Equilibrium analysis with automatically measured Equivalent Widths injected into the code MOOG and a grid of Kurucz ATLAS9 atmospheres. Oxygen abundances, derived using different lines, were taken from previous papers in this series and updated with the new stellar parameters. We find that thick- and thin-disk stars are chemically disjunct for [C/Fe] across the full metallicity range that they have in common. Moreover, the population of high-{alpha} metal-rich stars also presents higher and clearly separated [C/Fe] ratios than thin-disk stars up to [Fe/H]~0.2dex. The [C/O] ratios present a general flat trend as a function of [O/H] but becomes negative at [O/H]>~0dex. This trend is more clear when considering stars of similar metallicity. We find tentative evidence that stars with low-mass planets at lower metallicities have higher [C/Fe] ratios than stars without planets at the same metallicity, in the same way as has previously been found for {alpha} elements. Finally, the elemental C/O ratios for the vast majority of our stars are below 0.8 when using the oxygen line at 6158{AA} however, the forbidden oxygen line at 6300{AA} provides systematically higher C/O values (going above 1.2 in a few cases) which also show a dependence on Teff. Moreover, by using different atmosphere models the C/O ratios can have a non negligible difference for cool stars. Therefore, C/O ratios should be scaled to a common solar reference in order to correctly evaluate its behaviour. We find no significant differences in the distribution of C/O ratios for the different populations of planet hosts, except when comparing the stars without detected planets with the stars hosting Jupiter-type planets. However, we note that this difference might be caused by the different metallicity distributions of both populations. The derivation of homogeneous abundances from high-resolution spectra in samples that are modest in size is of great utility in constraining models of Galactic chemical evolution. The combination of these high-quality data with the long-term study of planetary presence in our sample is crucial for achieving an accurate understanding of the impact of stellar chemical composition on planetary formation mechanisms.2021A&A...655A..99Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/655/A99CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/545/A32 : Chemical abundances of 1111 FGK stars (Adibekyan+, 2012)J/A+A/606/A94 : Chemical abundances of 1059 FGK stars (Delgado Mena+, 2017)J/A+A/634/A136 : Chemical sulfur abundances of 719 FGK starshttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/655/A99https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/655/A99http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/655/A99https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/655/A99https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/655/A99http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/655/A99GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/655/A99/table (Abundance ratios, errors, planet presence)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/655/A99/table?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/655/A99/table?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/655/A99/table?GETtext/xml+votable180.050000true86.1329933-70.14357140.0055555555555555566/8235 8296 12424 12644 16408 16511 16518 16533 16543 16639 16649 16652 16776 16841 16874 16883 16931 16986 17035 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27661 27741 28703 28719 28763-28764 28854 28874 28887 28894 28919 28961 29146 29236 29238 29289 29349 29410 29513 29515 29521 29596 29598 29675 29688 29833 29842 29900 29928 29974 30233 30720 30825 30848 30878 30890 30919 30939 30943 30951 31015 31027 31029 31380 31480 31503 31650 31813 32787 32838 32848 32912 32915 32930 32986 32998 33063 33082 33086 33091 33122 33160 33182 33204 33219 33273 33357 33361 33400 33430 33456 33510 33552 33555 33590 33608 33630 33649 33685 33709 33717 33782 33871 33879 33890 33923 33945 33949 33974 34060 34102 34119 34128 34164 34173 34192 34199 34204 34219 34290 34306 34308 34336 34350 34372 34442 34446 34497 34515-34516 34530 34564 34638 34674 34684 34695 34744 34807 34817 34856 34864 34905 34947 34951 34983 35036 35121 35152 35174 35214 35230 35339 35347 35362 35392 35415 35440 35468 35502 35533 35590 35691 35733 35779 35781 35784 35790 35811 35855 35858 35885 35928 35954 35966 35968-35969 35985 35994 36014 36019 36089 36115 36285 36360 36453 36540 36590 36635 36723 36784 36800 36813 36825 36926 36971 36977 37049 37074 37094 37130 37134 37164 37208 37222 37232 37252 37306 37383 37397 37419 37422 37449 37501 37573 37583 37595 37660 37668 37679 37789 37807-37808 37831-37832 37944 37954 37995 38055 38099 38138 38162 38216 38238 38279 38283 38288 38311 38339 38349 38378 38433-38434 38462 38545 38562 38566 38605 38698 38734 38738 38742 38788 38792 38807 38813 38834 38837 38905 38936 38955 38960 38971 38975 38986 38998 39006 39030 39034 39074 39110 39149 39176 39219 39257 39282-39283 39298 39314 39316 39321 39364 39377 39422 39461 39576 39584 39600 39733 39767 39775 39854 39859 39877 39888 39915 39984 40019 40066 40078 40101 40105 40197 40317 40442 40453 40480 40514 40590 40662 40687 40692 40722 40749 40802 40853 40921 40931-40932 40938 40965 40970-40971 40985 40988 41023 41058 41094 41107 41112 41127 41143 41167 41175 41204 41212 41255 41355 41443 41459 41521 41524 41533 41564 41590-41591 41607 41671 41724 41752 41755 41853 41861 41899 41912 41941 41949 41969 42003 42006 42146 42157 42166 42171 42179 42200 42221 42248 42281 42318 42326 42386 42448 42460 42479 42486 42501 42602 42632 42662 42700 42759-42760 42769 42828 42845 42860 42891-42892 42906 42918 42928 42934 43001 43012 43067-43068 43171 43177 43228 43258 43267 43280 43287 43290 43306 43310 43315 43544 43558 43567 43577 43612 43639 43641 43649 43670 43672 43680 43724 43760 43781 43813 43818 43911 43944 43977 44054 44115 44131 44150 44208 44243 44260 44315 44340 44359 44374 44398 44600 44608 44637-44638 44653 44683 44740 44887 44910 44951 45034 45121 45143 45168 45182 45204 45228 45237 45265 45299 45309 45337 45378 45420 45422 45430 45446 45457 45502 45627 45640-45641 45656 45668-45669 45682 45687 45721 45752 45758 45837 45865 45892 45907 45924 45948 46053 46076 46080 46084 46111-46112 46135 46170-46172 46193 46234 46247-46248 46274 46287 46297 46306 46333 46352 46355 46494 46511 46526 46558-46559 46639-46640 46681 46685 46713 46734 46768 46776 46800 46805 46829 46874 46944 46967 46971 47022 47030 47045 47073 47137 47157 47253 47308 47364 47407 47510 47590 47600 47629 47647 47655 47674 47712 47740 47795 47858 47903 47930 48014 48022 48105 48172 48182 48260 48335 48345 48350 48361-48362 48402 48490 48519 48545 48581 48583 48607 48664 48679 48705 48707 48731 48736 48821 48846 48865 48870 48943 48980 49028 49036 49042 49060 49097 49114 49128https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/655/A99?format=asciidefaultJ/A+A/655/A99/tableAbundance ratios, errors, planet presenceS/NSignal to noise ratiostat.snrintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarStar's identifiermeta.id;meta.maincharTeffEffective TemperatureKphys.temperature.effectiveintloggSurface gravitylog(cm.s**-2)phys.gravityfloat[Fe/H]Iron abundancephys.abund.Fefloat[C/Fe]? Abundance [C/Fe]log(Sun)phys.abundfloatnullablee_[C/Fe]? Error of [C/Fe]log(Sun)stat.error;phys.abundfloatnullable[O1/Fe]? Abundance [O/Fe] from 6158{AA} linelog(Sun)phys.abundfloatnullablee_[O1/Fe]? Error of [O/Fe] from 6158{AA} linelog(Sun)stat.error;phys.abundfloatnullable[O2/Fe]? Abundance [O/Fe] from 6300{AA} linelog(Sun)phys.abundfloatnullablee_[O2/Fe]? Error of [O/Fe] from 6300{AA} linelog(Sun)stat.error;phys.abundfloatnullable[C/O1]? Ratio [C/O] using 6158{AA} linelog(Sun)phys.abundfloatnullable[C/O2]? Ratio [C/O] using 6300{AA} linelog(Sun)phys.abundfloatnullableplanetType of the most massive planet present (jup, nept or non)src.classcharpopGalactic population (thick, thin, halo or hamr)meta.codecharSimbadNameSimbad column added by the CDSmeta.idcharnullable_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.main