New giant planet beyond the snow line for an extended MOA exoplanet microlens sample. Issue 1 (26th June 2021)

• Record Type: Journal Article
• Authors: Ranc, Clément; Bennett, David P; Barry, Richard K; Koshimoto, Naoki; Skowron, Jan; Hirao, Yuki; Bond, Ian A; Sumi, Takahiro; Bathe-Peters, Lars; Abe, Fumio; Bhattacharya, Aparna; Donachie, Martin; Fujii, Hirosane; Fukui, Akihiko; Ishitani Silva, Stela; Itow, Yoshitaka; Kirikawa, Rintaro; Kondo, Iona; Alex Li, Man Cheung; Matsubara, Yutaka; Muraki, Yasushi; Miyazaki, Shota; Olmschenk, Greg; Rattenbury, Nicholas J; Satoh, Yuki; Shoji, Hikaru; Suzuki, Daisuke; Tanaka, Yuzuru; Tristram, Paul J; Yamawaki, Tsubasa; Yonehara, Atsunori;
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 506:Issue 1(2021)
• Page Start: 1498
• Page End: 1506
• Publication Date: 2021-06-26
• Subjects: gravitational lensing: micro -- planets and satellites: detection; Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/stab1787
• Languages: English
• ISSNs: 0035-8711

Abstract

ABSTRACT: Characterizing a planet detected by microlensing is hard if the planetary signal is weak or the lens-source relative trajectory is far from caustics. However, statistical analyses of planet demography must include those planets to accurately determine occurrence rates. As part of a systematic modelling effort in the context of a >10-yr retrospective analysis of MOA's survey observations to build an extended MOA statistical sample, we analyse the light curve of the planetary microlensing event MOA-2014-BLG-472. This event provides weak constraints on the physical parameters of the lens, as a result of a planetary anomaly occurring at low magnification in the light curve. We use a Bayesian analysis to estimate the properties of the planet, based on a refined Galactic model and the assumption that all Milky Way's stars have an equal planet-hosting probability. We find that a lens consisting of a $1.9^{+2.2}_{-1.2}\, \mathrm{M}_\mathrm{J}$ giant planet orbiting a $0.31^{+0.36}_{-0.19}\, \mathrm{M}_\odot$ host at a projected separation of $0.75\pm 0.24\, \mathrm{au}$ is consistent with the observations and is most likely, based on the Galactic priors. The lens most probably lies in the Galactic bulge, at $7.2^{+0.6}_{-1.7}\, \mathrm{kpc}$ from Earth. The accurate measurement of the measured planet-to-host star mass ratio will be included in the next statistical analysis of cold planet demography detected by microlensing.