Searching for substellar companion candidates with Gaia. II. A catalog of 9,698 planet candidate solar-type hosts
arXiv:2409.16993 · doi:10.1051/0004-6361/202451745
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 sources whose companions could be planetary, with a mass <13.5 MJup. It led us to identify a sample of 9,698 planet candidate hosting sources, whose companion may have a mass <13.5 MJup in the range of 1-3-au sma. We identified 19 systems that are also reported in the Nasa exoplanet archive. We detected 8 substellar companions with a 1-3-au sma, initially discovered and characterised with RV and astrometry. Moreover, we found 6 transiting-planet systems and 2 wide-orbit systems for whom we predict the existence of supplementary companions. Focusing on the subsample of sources observed with Hipparcos, combining RUWE and PMa, we confirmed the identification of 4 new planetary candidate systems HD 187129, HD 81697, CD-42 883, and HD 105330. Given the degeneracy of mass-sma, many of the candidates in this 9,698 sources catalog might have a larger mass, in the brown-dwarf and stellar domain, if their sma departs from the 1-3-au range. The vetting of this large catalog will be the subject of future studies.
13 pages, 14 figures + appendix; accepted for publication in A&A on 03/09/2024
References in corpus (28)
- Gaia Early Data Release 3: The astrometric solution
- Gaia Early Data Release 3 -- Catalogue validation
- Astrometric exoplanet detection with Gaia
- The Hipparcos-Gaia Catalog of Accelerations: Gaia EDR3 Edition
- Gaia Data Release 3: Stellar multiplicity, a teaser for the hidden treasure
- Stellar and substellar companions from Gaia EDR3 -- Proper motion anomaly and resolved common proper motion pairs
- Gaia Data Release 3: Astrophysical parameters inference system (Apsis) I -- methods and content overview
- Gaia DR3 astrometric orbit determination with Markov Chain Monte Carlo and Genetic Algorithms. Systems with stellar, substellar, and planetary mass companions
- New planetary and EB candidates from Campaigns 1-6 of the K2 mission
- 3-D selection of 167 sub-stellar companions to nearby stars
- AF Lep b: the lowest mass planet detected coupling astrometric and direct imaging data
- Direct imaging discovery of a super-Jovian around the young Sun-like star AF Leporis
- Astrometric Accelerations as Dynamical Beacons: A Giant Planet Imaged Inside the Debris Disk of the Young Star AF Lep
- Gaia's potential for the discovery of circumbinary planets
- Determining the true mass of radial-velocity exoplanets with Gaia: 9 planet candidates in the brown-dwarf/stellar regime and 27 confirmed planets
- The HARPS search for southern extra-solar planets. IX. Exoplanets orbiting HD 100777, HD 190647, and HD 221287
- Joint Constraints on Exoplanetary Orbits from Gaia DR3 and Doppler Data
- The Masses of a Sample of Radial-Velocity Exoplanets with Astrometric Measurements
- The HARPS search for southern extra-solar planets XLV. Two Neptune mass planets orbiting HD 13808: a study of stellar activity modelling's impact on planet detection
- Spitzer transit follow-up of planet candidates from the K2 mission
- Determining the mass of the planetary candidate HD 114762 b using Gaia
- Spectroscopic follow-up of Gaia exoplanet candidates: Impostor binary stars invade the Gaia DR3 astrometric exoplanet candidates
- Planetary candidates transiting cool dwarf stars from Campaigns 12 to 15 of K2
- USco1621 B and USco1556 B: Two wide companions at the deuterium-burning mass limit in Upper Scorpius
- Gaia predicted brown dwarf detection rates around FGK stars in astrometry, radial velocity, and photometric transits
- Multi techniques approach to identify and/or constrain radial velocity sub-stellar companions
- Zodiacal Exoplanets in Time (ZEIT) XII: A Directly-Imaged Planetary-Mass Companion to a Young Taurus M Dwarf Star
- The HARPS search for southern extra-solar planets. XLVII. Five Jupiter-mass planets in long-period orbits, one highly irradiated Neptune, one brown dwarf, and five stellar binaries