2020/04/30 by Yuki Hirao, David P. Bennett, Yoon-Hyun Ryu +102
Physics and Astronomy · #Astro and Planetary Science #Astronomy and Astrophysical Research #Exoplanet #Gravitational microlensing #Parallax #Planet #Planetary system #Population #Proper motion #Solar System #Stellar, planetary, and galactic studies #astro-ph.EP #astro-ph.GA #astro-ph.SR
paper · pdf · doi:10.3847/1538-3881/ab9ac3
40 pages, 12 figures, 10 tables, accepted for publication in The Astronomical Journal
openalex created_date 2020/04/24 · arxiv created 2020/06/06 · openalex publication_date 2020/07/23 · arxiv updated 2020/07/29 · openalex updated_date 2026/08/06
Abstract We report the discovery and analysis of the planetary microlensing event OGLE-2017-BLG-0406, which was observed both from the ground and by the Spitzer satellite in a solar orbit. At high magnification, the anomaly in the light curve was densely observed by ground-based-survey and follow-up groups, and it was found to be explained by a planetary lens with a planet/host mass ratio of from the light-curve modeling. The ground-only and Spitzer-“only” data each provide very strong one-dimensional (1D) constraints on the 2D microlens parallax vector . When combined, these yield a precise measurement of and of the masses of the host and planet M planet = 0.41 ± 0.05 M Jup . The system lies at a distance D L = 5.2 ± 0.5 kpc from the Sun toward the Galactic bulge, and the host is more likely to be a disk population star according to the kinematics of the lens. The projected separation of the planet from the host is (i.e., just over twice the snow line). The Galactic-disk kinematics are established in part from a precise measurement of the source proper motion based on OGLE-IV data. By contrast, the Gaia proper-motion measurement of the source suffers from a catastrophic 10 σ error.