The SOPHIE search for northern extrasolar planets - XII. Three giant planets suitable for astrometric mass determination with Gaia

TL;DR

This paper reports the discovery of three giant exoplanets around low-metallicity stars using radial velocity measurements, highlighting their suitability for future astrometric mass determination with Gaia.

Contribution

It presents new radial velocity data leading to the detection of three giant planets and discusses their potential for astrometric mass measurement with Gaia.

Findings

Three new giant exoplanets detected with periods of 1.7 to 3.7 years.

Planets have minimum masses between 0.9 and 2.5 Jupiter masses.

Targets are suitable for astrometric mass determination with Gaia.

Abstract

We present new radial velocity measurements for three low-metallicity solar-like stars observed with the SOPHIE spectrograph and its predecessor ELODIE, both installed at the 193 cm telescope of the Haute-Provence Observatory, allowing the detection and characterization of three new giant extrasolar planets in intermediate periods of 1.7 to 3.7 years. All three stars, HD17674, HD42012 and HD29021 present single giant planetary companions with minimum masses between 0.9 and 2.5 MJup. The range of periods and masses of these companions, along with the distance of their host stars, make them good targets to look for astrometric signals over the lifetime of the new astrometry satellite Gaia. We discuss the preliminary astrometric solutions obtained from the first Gaia data release.