The HARPS search for southern extrasolar planets. XXIII. 8 planetary companions to low-activity solar-type stars

TL;DR

This study reports the detection of eight new low-mass planetary companions orbiting low-activity solar-type stars using HARPS radial-velocity data, expanding the known diversity of exoplanetary systems.

Contribution

First detection of eight low-mass planets around low-activity solar-type stars using HARPS, with diverse orbital characteristics.

Findings

Minimum masses range from 0.58 to 2.54 MJup

Orbital periods from less than one to nearly seven years

Eccentricities vary from 0.08 to above 0.8

Abstract

In this paper, we present our HARPS radial-velocity data for eight low-activity solar-type stars belonging to the HARPS volume-limited sample: HD6718, HD8535, HD28254, HD290327, HD43197, HD44219, HD148156, and HD156411. Keplerian fits to these data reveal the presence of low-mass companions around these targets. With minimum masses ranging from 0.58 to 2.54 MJup, these companions are in the planetary mass domain. The orbital periods of these planets range from slightly less than one to almost seven years. The eight orbits presented in this paper exhibit a wide variety of eccentricities: from 0.08 to above 0.8.