Searching for substellar companion candidates with Gaia. II. A catalog of 9,698 planet candidate solar-type hosts
Flavien Kiefer, Anne-Marie Lagrange, Pascal Rubini, Florian Philipot

TL;DR
This paper introduces GaiaPMEX to identify 9,698 potential exoplanet host stars using Gaia DR3 data, focusing on companions with masses below 13.5 MJup within 1-3 au, aiding future follow-up observations.
Contribution
It presents a new catalog of planet candidates around solar-type stars based on GaiaPMEX, expanding the search for exoplanets using Gaia astrometric data.
Findings
Identified 9,698 candidate hosts with potential substellar companions.
Detected 8 companions previously characterized by RV and astrometry.
Confirmed 4 new planetary candidates using combined Gaia and Hipparcos data.
Abstract
In a previous paper, we introduced a new tool called GaiaPMEX. It characterizes the mass and semi-major axis relative to the central star (sma) of a possible companion around any source observed with Gaia. It uses the value of RUWE, or, with both Gaia and Hipparcos, the value of proper motion anomaly (PMa), alone or combined with the RUWE. Our goal is to exploit the large volume of sources in Gaia's DR3 and find new exoplanet candidates. We wish to create a new input catalog of planet-candidate hosting systems to the disposal of future follow-up projects. Beyond G=14, this catalog would prepare the arrival of powerful instruments on the ELTs, that could include RV follow-up of faint stars and direct imaging of planets around main sequence Gyr-old stars. We used the mass-sma degenerate set of solutions obtained by GaiaPMEX from any value of RUWE to select a sample of bright (G<16) Gaia…
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Taxonomy
TopicsStellar, planetary, and galactic studies · Astronomy and Astrophysical Research · Astro and Planetary Science
