As of February 2025, there are around 5800 confirmed exoplanets detected in the Milky Way, and the number is constantly growing. In addition, the accuracy of determined planetary physical and orbital parameters is also improving.
Thanks to a large amount of available data about exoplanets and their stars it is now possible to investigate the distributions of various planetary physical and orbital parameters, as well as their correlations with the parameters of their stars and the chemical abundances of elements in their atmospheres. For example, in a study by Petigura et al., 2018 it has been found that while massive planets are usually found orbiting stars with higher metallicities, that correlation isn’t as prominent in terrestrial planets, indicating that stellar metallicity might play a role in determining the compositions of planets that form around a star.
A large amount of exoplanets have been detected around stars like the Sun. Solar twin and analogue stars have similar physical parameters (effective temperature, surface gravity) to the Sun and are assumed to have similar evolutionary histories. Because of this, they are useful when analysing various stellar chemical abundance trends.
Using spectra from the Vilnius University Echelle Spectrograph (VUES), I have determined the chemical abundances of alpha- and iron-group elements for 28 solar twins and analogues with confirmed exoplanets. I looked for potential correlations between the chemical compositions of planetary host stars and the parameters of the planets orbiting them. In this poster, I will present my findings.