Chemical imprints in atmospheric abundance of stars with massive planets
Abstract
<strong>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.</strong>
- Publication:
-
The 20.5th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun (CS20.5)
- Pub Date:
- March 2021
- DOI:
- 10.5281/zenodo.4558086
- Bibcode:
- 2021csss.confE..14M
- Keywords:
-
- Stellar Systems