Parent Stars of Extrasolar Planets. XI. Trends with Condensation Temperature Revisited

TL;DR

This study compares elemental abundance trends with condensation temperature in stars with and without planets, revealing that stars with planets, especially metal-rich ones, tend to have more negative trends, confirming previous findings.

Contribution

It extends prior research by analyzing a broader sample of stars, demonstrating that stars with planets exhibit more negative abundance-condensation temperature trends, especially among metal-rich stars.

Findings

Stars with planets have more negative abundance-condensation temperature trends.

Metal-rich stars with planets show the most negative trends.

Differences between solar and meteoritic abundances correlate with condensation temperature.

Abstract

We report the results of abundance analyses of new samples of stars with planets and stars without detected planets. We employ these data to compare abundance-condensation temperature trends in both samples. We find that stars with planets have more negative trends. In addition, the more metal-rich stars with planets display the most negative trends. These results confirm and extend the findings of Ramirez et al. (2009) and Melendez et al. (2009), who restricted their studies to solar analogs. We also show that the differences between the solar photospheric and CI meteoritic abundances correlate with condensation temperature.