Abundances in the atmosphere of the metal-rich planet-host star HD 77338

TL;DR

This study determines the elemental abundances in the atmosphere of the metal-rich star HD 77338, which hosts a hot Uranus-like planet, revealing over-abundances of some iron peak elements using a self-consistent iterative approach.

Contribution

It applies a self-consistent iterative method to accurately measure elemental abundances in a metal-rich planet-host star, highlighting over-abundances of certain elements.

Findings

Most elements follow iron abundance trends.

Some iron peak elements are over-abundant.

HD 77338 is the most metal-rich star known to host a planet.

Abstract

Abundances of Fe, Si, Ni, Ti, Na, Mg, Cu, Zn, Mn, Cr and Ca in the atmosphere of the K-dwarf HD 77338 are determined and discussed. HD 77338 hosts a hot Uranus-like planet and is currently the most metal-rich single star to host any planet. Determination of abundances was carried out in the framework of a self-consistent approach developed by Pavlenko et al. (2012). Abundances were computed iteratively by the program ABEL8, and the process converged after 4 iterations. We find that most elements follow the iron abundance, however some of the iron peak elements are found to be over-abundant in this star.