The Solar Twin Planet Search I. Fundamental Parameters Of The Stellar Sample

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dc.contributor.utaustinauthorI. Ramírezen_US
dc.creatorRamirez, I.en_US
dc.creatorMelendez, J.en_US
dc.creatorBean, J.en_US
dc.creatorAsplund, M.en_US
dc.creatorBedell, M.en_US
dc.creatorMonroe, T.en_US
dc.creatorCasagrande, L.en_US
dc.creatorSchirbel, L.en_US
dc.creatorDreizler, S.en_US
dc.creatorTeske, J.en_US
dc.creatorMaia, M. T.en_US
dc.creatorAlves-Brito, A.en_US
dc.creatorBaumann, P.en_US
dc.date.accessioned2016-04-22T19:46:17Z
dc.date.available2016-04-22T19:46:17Z
dc.date.issued2014-12en
dc.description.abstractContext. We are carrying out a search for planets around a sample of solar twin stars using the HARPS spectrograph. The goal of this project is to exploit the advantage offered by solar twins to obtain chemical abundances of unmatched precision. This survey will enable new studies of the stellar composition - planet connection. Aims. We determine the fundamental parameters of the 88 solar twin stars that have been chosen as targets for our experiment. Methods. We used the MIKE spectrograph on the Magellan Clay Telescope to acquire high resolution, high signal-to-noise ratio spectra of our sample stars. We measured the equivalent widths of iron lines and used strict differential excitation/ionization balance analysis to determine atmospheric parameters of unprecedented internal precision: sigma(T-eff) = 7K, sigma(log g) = 0.019, sigma([Fe/H]) = 0.006 dex, sigma(v(t)) = 0.016 km s(-1). Reliable relative ages and highly precise masses were then estimated using theoretical isochrones. Results. The spectroscopic parameters we derived are in good agreement with those measured using other independent techniques. There is even better agreement if the sample is restricted to those stars with the most internally precise determinations of stellar parameters in every technique involved. The root-mean-square scatter of the differences seen is fully compatible with the observational errors, demonstrating, as assumed thus far, that systematic uncertainties in the stellar parameters are negligible in the study of solar twins. We find a tight activity-age relation for our sample stars, which validates the internal precision of our dating method. Furthermore, we find that the solar cycle is perfectly consistent both with this trend and its star-to-star scatter. Conclusions. We present the largest sample of solar twins analyzed homogeneously using high quality spectra. The fundamental parameters derived from this work will be employed in subsequent work that aims to explore the connections between planet formation and stellar chemical composition.en_US
dc.description.departmentAstronomyen_US
dc.description.sponsorshipNASA's Sagan Fellowship ProgramFAPESP 2012/24392-2, 2013/25008-4en_US
dc.description.sponsorshipCNPq (Bolsa de Produtividade)en_US
dc.description.sponsorshipNational Science Foundation (NSF) AST-1313119, DGE-1144082en_US
dc.identifierdoi:10.15781/T2KF7G
dc.identifier.citationRamírez, I., J. Meléndez, J. Bean, M. Asplund, M. Bedell, T. Monroe, L. Casagrande et al. >The Solar Twin Planet Search-I. Fundamental parameters of the stellar sample.> Astronomy & Astrophysics, Vol. 572 (Dec., 2014): A48.en_US
dc.identifier.doi10.1051/0004-6361/201424244en_US
dc.identifier.issn0004-6361en_US
dc.identifier.urihttp://hdl.handle.net/2152/34435
dc.language.isoEnglishen_US
dc.relation.ispartofserialAstronomy & Astrophysicsen_US
dc.rightsAdministrative deposit of works to Texas ScholarWorks: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University.en_US
dc.subjectstars: abundancesen_US
dc.subjectstars: fundamental parametersen_US
dc.subjectplanetary systemsen_US
dc.subjectinfrared flux methoden_US
dc.subjectlate-type starsen_US
dc.subjectca-ii hen_US
dc.subjecthigh-precisionen_US
dc.subjectabundancesen_US
dc.subjectvelocity standard starsen_US
dc.subjectmain-sequence starsen_US
dc.subjectcool dwarfen_US
dc.subjectstarsen_US
dc.subjectcondensation temperatureen_US
dc.subjectelemental abundanceen_US
dc.subjectmodel atmospheresen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleThe Solar Twin Planet Search I. Fundamental Parameters Of The Stellar Sampleen_US
dc.typeArticleen_US

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