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• W1617757843 abstract "We illuminate the connection between the chemical abundance ratios in stellar atmospheres and the presence of planets around the respective stars. In order to obtain reliable results, we consider only solar-type stars and conduct spectroscopic parameter and abundance analyzes in a strictly differential way relative to the Sun. Altogether, we examine exceptionally high quality spectra for almost 200 stars obtained with the most sophisticated telescopes available to us. The first sample of 117 solar analogs is used to examine a possible connection between the surface lithium abundance of a star, its age, and its likelihood to host a planet. We determine very precise fundamental stellar parameters for each star using a carefully chosen set of Fe i and Fe ii lines, up-to-date and well-tested model atmospheres, and state-of-the-art spectrum modeling routines. Masses and ages of the objects are determined using isochrone fits of the stellar parameters, resulting in solid relative parameters. For young stars, were isochrone ages are unreliable, we compare different alternative techniques. Lithium abundances are gained from spectral line synthesis of the lithium doublet at 6708 A. Based on our results, a correlation between lithium abundance and the presence of planets can be ruled out, while it can be shown, that earlier findings indicating such a connection are based on selection biases. To confirm the occurrence of some high-lithium subgiants detected in the solar analogs sample, we analyze a set of 76 evolved stars in the next step using the same techniques as before. We show, that most of the stars picked for this analysis really have evolved from the main sequence, and that their average lithium abundance is distinctly higher than in the main sequence case. The reason for this increase remains to be discussed, possible explanations are presented in the work. As a testing scenario for larger samples, we explore the condensation temperature trend in α Centauri A. In a very carefull analysis using different high-quality spectra for α Centauri A and the Sun, we determine abundances for 20 elements in the object’s photosphere. It has been suggested, that an underabundance in refractory elements relative to volatiles could be an indicator for the presence of rocky planets. α Centauri A does show an even stronger underabundance than the Sun, which is why we conclude that α Centauri A is a hot candidate in the search for extrasolar planets." @default.
• W1617757843 created "2016-06-24" @default.
• W1617757843 creator A5080527281 @default.
• W1617757843 date "2013-04-08" @default.
• W1617757843 modified "2023-09-27" @default.
• W1617757843 title "The chemical composition of solar-type stars and its impact on the presence of planets" @default.
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