Poster Open Access

Chemical imprints in atmospheric abundance of stars with massive planets

Mishenina Tamara; Basak Nina; Adibekyan Vardan; Soubiran Caroline; Kovtyukh Valery

Stellar parameters of 25 stars with detected massive planets and abundances of 25 elements from Li to  Eu,  were investigated based on homogeneous high resolution spectra. The iron abundance [Fe/H] and key  elements (Li, C, O, Mg, Si) indicative of the planet formation,  as well as the dependencies of [El/Fe] on the condensation temperature (Tcond), were analyzed. We found some interesting results:  the  mean values of C/O  and [C/O] are <C/O>  = 0.48 ±0.07 and <[C/O]> = -0.07 ±0.07, slightly lower than solar ones; the Mg/Si ratios range from 0.83 to 0.95 for four stars in our sample  and from 1.0 to 1.86 for the remaining 21 stars; various slopes of [El/Fe] versus Tcond. The dependencies of the planetary mass on metallicity, the lithium abundance, the C/O and Mg/Si ratios, and also on the [El/Fe]--Tcond slopes were considered.

 

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