ASTROMETRIC EXOPLANET DETECTION WITH GAIA

By M. Perryman, Joel D. Hartman, Gáspár Á. Bakos, L. Lindegren. 2014

207 citations recorded by the source corpus.

We provide a revised assessment of the number of exoplanets that should be discovered by Gaia astrometry, extending previous studies to a broader range of spectral types, distances, and magnitudes. Our assessment is based on a large representative sample of host stars from the TRILEGAL Galaxy population synthesis model, recent estimates of the exoplanet frequency distributions as a function of stellar type, and detailed simulation of the Gaia observations using the updated instrument performance and scanning law. We use two approaches to estimate detectable planetary systems: one based on the signal-to-noise ratio of the astrometric signature per field crossing, easily reproducible and allowing comparisons with previous estimates, and a new and more robust metric based on orbit fitting to the simulated satellite data. With some plausible assumptions on planet occurrences, we find that some 21,000 (±6000) high-mass (∼1–15MJ) long-period planets should be discovered out to distances of ∼500 pc for the nominal 5 yr mission (including at least 1000–1500 around M dwarfs out to 100 pc), rising to some 70,000 (±20, 000) for a 10 yr mission. We indicate some of the expected features of this exoplanet population, amongst them ∼25–50 intermediate-period (P ∼ 2–3 yr) transiting systems.

Subfields: Astronomy and Astrophysics, Instrumentation, Statistical and Nonlinear Physics

View Paper: https://www.semanticscholar.org/paper/969f2d5e41087706291f3e241b36c98ddd1365a2

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Citations in the corpus

Unresolved stellar companions with Gaia DR2 astrometry (2020, background): “…stellar companions that are tricky to observe otherwise such as exosolar planets (Lattanzi et al. 1997; Sozzetti et al. 2001; Casertano et al. 2008; Perryman et al. 2014) and dark remnants such as black holes (Breivik, Chatterjee & E-mail: vasily@ast.cam.ac.uk Larson 2017; Mashian & Loeb 2017;…”
Imaging Extrasolar Giant Planets (2016, background): “This will be particularly relevant in the near-future with Gaia as thousands of planets are expected to be found from the orbital reflex motion of their host stars (Sozzetti et al. 2013; Perryman et al. 2014).”
Predictions of the WFIRST Microlensing Survey. I. Bound Planet Detection Rates (2018, methodology): “Astrometry from Gaia can be used to discover a large sample of giant planets in similar orbits, but it will not have the sensitivity to probe below ∼30M⊕ (Perryman et al. 2014).”