Updated characterization of long-period single companion by combining radial velocity, relative astrometry, and absolute astrometry

Abstract

Context. Thanks to more than 20 years of monitoring, the radial velocity (RV) method has detected long-period companions (P > 10yr) around several dozens of stars. Yet, the true nature of these companions remains unclear because of the uncertainty as to the inclination of the companion orbital plane. Aims. We wish to constrain the orbital inclination and the true mass of long-period single companions. Methods. We used a Markov Chain Monte Carlo (MCMC) fitting algorithm to combine RV measurements with absolute astrometry and, when available, relative astrometry data. Results. We have lifted the sin(i) indetermination for 7 seven long-period companions. We find true masses in the planetary mass range for the candidate planets detected in the following systems: Epsilon Indi A, HD 13931, HD 115954, and HD 222155. The mass of HD 219077 b is close to the deuterium-burning limit and its nature is uncertain because of the imprecise mass of the host star. Using additional RV measurements, we refine the orbital parameters of HIP 70849 b and find a mass in the planetary range. By combining RV data with absolute and relative astrometry, we significantly improve the characterization of HD 211847 B and properly determine its mass, which appears to be in the low-mass star range. This work illustrates how Gaia and Hipparcos allow for the orbital properties and masses of long-period RV companions to be further constrained.

17 pages, 15 figures

References in corpus (22)

• The Gaia mission
• The Hipparcos-Gaia Catalog of Accelerations: Gaia EDR3 Edition
• Hints for a Turnover at the Snow Line in the Giant Planet Occurrence Rate
• Stellar and substellar companions from Gaia EDR3 -- Proper motion anomaly and resolved common proper motion pairs
• The Extrasolar Planet epsilon Eridani b - Orbit and Mass
• Cool Jupiters greatly outnumber their toasty siblings: Occurrence rates from the Anglo-Australian Planet Search
• orvara: An Efficient Code to Fit Orbits using Radial Velocity, Absolute, and/or Relative Astrometry
• 3-D selection of 167 sub-stellar companions to nearby stars
• The Mass of the Candidate Exoplanet Companion to HD 33636 from Hubble Space Telescope Astrometry and High-Precision Radial Velocities
• The CORALIE survey for southern extrasolar planets XVII. New and updated long period and massive planets
• Detection of the nearest Jupiter analog in radial velocity and astrometry data
• Improved Dynamical Masses for Six Brown Dwarf Companions Using Hipparcos and Gaia EDR3
• Precise Dynamical Masses and Orbital Fits for $\beta$ Pic b and $\beta$ Pic c
• A precise architecture characterization of the $\pi$ Men planetary system
• The Gemini Planet Imager Exoplanet Survey: Dynamical Mass of the Exoplanet beta Pictoris b from Combined Direct Imaging and Astrometry
• True masses of the long-period companions to HD 92987 and HD 221420 from Hipparcos-Gaia astrometry
• Detection of Planetary and Stellar Companions to Neighboring Stars via a Combination of Radial Velocity and Direct Imaging Techniques
• Truly eccentric. I. Revisiting eight single-eccentric planetary systems
• Dynamical masses for two M1 + mid-M dwarf binaries monitored during the SPHERE-SHINE survey
• The SOPHIE search for northern extrasolar planets. XVIII: Six new cold Jupiters, including one of the most eccentric exoplanet orbits
• The California Legacy Survey II. Occurrence of Giant Planets Beyond the Ice line
• The California Legacy Survey I. A Catalog of 178 Planets from Precision Radial Velocity Monitoring of 719 Nearby Stars over Three Decades

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• A temperate super-Jupiter imaged with JWST in the mid-infrared
• On the radial distribution of giant exoplanets at Solar System scales
• The SOPHIE search for northern extrasolar planets-XIX. A system including a cold sub-Neptune potentially transiting a V = 6.5 star HD88986
• The GAPS programme at TNG XLIV. Projected rotational velocities of 273 exoplanet-host stars observed with HARPS-N
• Multiplicity of stars with planets in the solar neighbourhood
• Detection and Characterisation of Giant Planets with Gaia Astrometry
• Multi techniques approach to identify and/or constrain radial velocity sub-stellar companions
• The COBREX archival survey: improved constraints on the occurrence rate of wide-orbit substellar companions. I. A uniform re-analysis of 400 stars from the GPIES survey
• HD 28185 Revisited: An Outer Planet, Instead of a Brown Dwarf, On a Saturn-like Orbit
• The SPHERE infrared survey for exoplanets (SHINE). V. Complete observations, data reduction and analysis, detection performances, and final results