Wide-Orbit Exoplanet Demographics

Bennett, David P.; Akeson, Rachel; Alibert, Yann; Anderson, Jay; Bachelet, Etienne; Beaulieu, Jean-Phillipe; Bellini, Andrea; Bhattacharya, Aparna; Boss, Alan; Bozza, Valerio; Bryson, Stephen; Buzasi, Derek; Novati, Sebastiano Calchi; Christiansen, Jessie; Domagal-goldman, Shawn D.; Endl, Michael; Fulton, Benjamin J.; Henderson, Calen B.; Gaudi, B. Scott; Johnson, Samson A.; ... (2019). Wide-Orbit Exoplanet Demographics (arXiv). Cornell University

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The Kepler, K2 and TESS transit surveys are revolutionizing our understanding of planets orbiting close to their host stars and our understanding of exoplanet systems in general, but there remains a gap in our understanding of wide-orbit planets. This gap in our understanding must be filled if we are to understand planet formation and how it affects exoplanet habitability. We summarize current and planned exoplanet detection programs using a variety of methods: microlensing (including WFIRST), radial velocities, Gaia astrometry, and direct imaging. Finally, we discuss the prospects for joint analyses using results from multiple methods and obstacles that could hinder such analyses.
We endorse the findings and recommendations published in the 2018 National Academy report on Exoplanet Science Strategy. This white paper extends and complements the material presented therein.

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