The multiplicity of exoplanet host stars - Spectroscopic confirmation of the companions GJ3021B and HD27442B, one new planet host triple-star system, and global statistics

TL;DR

This paper reports on a study of exoplanet host stars with multiple stellar companions, confirming several companions spectroscopically, discovering a new triple-star system hosting a planet, and analyzing the statistical properties of these systems.

Contribution

It provides a comprehensive list of 29 confirmed multiple-star systems hosting exoplanets and compares their properties with planets around single stars, including the discovery of a new triple-star system.

Findings

29 confirmed multiple-star exoplanet systems

Spectroscopic confirmation of companions GJ3021B and HD27442B

Identification of a new planet-hosting triple-star system

Abstract

We present new results from our ongoing multiplicity study of exoplanet host stars and present a list of 29 confirmed planet host multiple-star systems. Furthermore, we discuss the properties of these stellar systems and compare the properties of exoplanets detected in these systems with those of planets orbiting single stars.