Low Mass Companions for Five Solar-Type Stars from the Magellan Planet Search Program

TL;DR

This paper reports the discovery of five low-mass companions orbiting solar-type stars, including planets and a brown dwarf, identified through the Magellan Doppler velocity survey, expanding knowledge of substellar objects around Sun-like stars.

Contribution

First report of five low-mass companions from the Magellan survey, including new planets and a brown dwarf, with detailed orbital characteristics.

Findings

Four planets with eccentric intermediate and long-period orbits.

One brown dwarf with a very eccentric long-period orbit.

Companions have masses from 1.2 to 25 Mjup.

Abstract

We report low mass companions orbiting five Solar-type stars that have emerged from the Magellan precision Doppler velocity survey, with minimum (Msini) masses ranging from 1.2 to 25 Mjup. These nearby target stars range from mildly metal-poor to metal-rich, and appear to have low chromospheric activity. The companions to the brightest two of these stars have previously been reported from the CORALIE survey. Four of these companions (HD 48265-b, HD 143361-b, HD 28185-b, HD 111232-b) are low-mass Jupiter-like planets in eccentric intermediate and long-period orbits. On the other hand, the companion to HD 43848 appears to be a long period brown dwarf in a very eccentric orbit.