The complementarity of astrometric and radial velocity exoplanet observations - Determining exoplanet mass with astrometric snapshots

Abstract

We obtain full information on the orbital parameters by combining radial velocity and astrometric measurements by means of Bayesian inference. We sample the parameter probability densities of orbital model parameters with a Markov chain Monte Carlo (McMC) method in simulated observational scenarios to test the detectability of planets with orbital periods longer than the observational timelines. We show that, when fitting model parameters simultaneously to measurements from both sources, it is possible to extract much more information from the measurements than when using either source alone. We demonstrate this by studying the orbit of recently found extra-solar planet HD 154345 b.

arXiv comment6 pages, 9 figures. Accepted to A&A

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• On the Orbital Inclination of Proxima Centauri b
• On the Inclination and Habitability of the HD 10180 System
• Detection and Characterisation of Giant Planets with Gaia Astrometry
• Radial velocity survey of spatially resolved young, low-mass binaries
• The NEID Earth Twin Survey. II. Dynamical Masses in Seven High-acceleration Star Systems
• Detection of eccentric close-binary supermassive black holes with incomplete interferometric data