The HARPS search for southern extra-solar planets XII. A giant planet orbiting the metal-poor star HD171028

TL;DR

This paper reports the discovery of a giant planet orbiting a metal-poor star, providing new insights into planet formation around such stars through a HARPS survey.

Contribution

It presents the first planet detection in a HARPS survey targeting metal-poor stars, expanding understanding of planet occurrence in low-metallicity environments.

Findings

Detected a 1.8 M_Jup planet with a 538-day orbit

First planet discovery in a HARPS metal-poor star survey

Supports models of planet formation around metal-poor stars

Abstract

In this paper we present the detection of a 1.8 M_Jup planet in a 538 day period trajectory orbiting the metal-poor star HD171028 ([Fe/H]=-0.49). This planet is the first to be discovered in the context of a HARPS program searching for planets around metal-poor stars. Interestingly, HD171028 is one of the least metal-poor stars in the sample. This discovery is placed in the context of the models of planet formation and evolution.