OGLE-2014-BLG-0319: A Sub-Jupiter-mass Planetary Event Encountered Degeneracy with Different Mass Ratios and Lens-source Relative Proper Motions - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles The Astronomical Journal Year : 2022

OGLE-2014-BLG-0319: A Sub-Jupiter-mass Planetary Event Encountered Degeneracy with Different Mass Ratios and Lens-source Relative Proper Motions

Shota Miyazaki
  • Function : Author
Daisuke Suzuki
  • Function : Author
Andrzej Udalski
  • Function : Author
Naoki Koshimoto
  • Function : Author
David P. Bennett
  • Function : Author
Takahiro Sumi
  • Function : Author
Nicholas Rattenbury
  • Function : Author
Han Cheongho
  • Function : Author
Fumio Abe
  • Function : Author
Richard K. Barry
  • Function : Author
Aparna Bhattacharya
  • Function : Author
Ian A. Bond
  • Function : Author
Akihiko Fukui
  • Function : Author
Hirosane Fujii
  • Function : Author
Yuki Hirao
  • Function : Author
Stela Ishitani Silva
  • Function : Author
Yoshitaka Itow
  • Function : Author
Rintaro Kirikawa
  • Function : Author
Iona Kondo
  • Function : Author
Brandon Munford
  • Function : Author
Yutaka Matsubara
  • Function : Author
Sho Matsumoto
  • Function : Author
Yasushi Muraki
  • Function : Author
Arisa Okamura
  • Function : Author
Greg Olmschenk
  • Function : Author
Clément Ranc
  • Function : Author
  • PersonId : 1181264
  • IdHAL : cr
Yuki K. Satoh
  • Function : Author
Taiga Toda
  • Function : Author
Paul J. Tristram
  • Function : Author
Hibiki Yama
  • Function : Author
Atsunori Yonehara
  • Function : Author
Radek Poleski
  • Function : Author
Przemek Mróz
  • Function : Author
Jan Skowron
  • Function : Author
Michal K. Szymański
  • Function : Author
Igor Soszyński
  • Function : Author
Pawel Pietrukowicz
  • Function : Author
Syzmon Kozłowski
  • Function : Author
Krzysztof Ulaczyk
  • Function : Author
Łukasz Wyrzykowski
  • Function : Author

Abstract

We report the discovery of a sub-Jovian-mass planet, OGLE-2014-BLG-0319Lb. The characteristics of this planet will be added into a future extended statistical analysis of the Microlensing Observations in Astrophysics (MOA) collaboration. The planetary anomaly of the light curve is characterized by MOA and OGLE survey observations and results in three degenerate models with different planetary-mass ratios of q = (10.3, 6.6, 4.5) × 10-4. We find that the last two models require unreasonably small lens-source relative proper motions of μ rel ~ 1 mas yr-1. Considering Galactic prior probabilities, we rule out these two models from the final result. We conduct a Bayesian analysis to estimate physical properties of the lens system using a Galactic model and find that the lens system is composed of a ${0.49}_{-0.27}^{+0.35}\ {M}_{\mathrm{Jup}}$ sub-Jovian planet orbiting a ${0.47}_{-0.25}^{+0.33}\ {M}_{\odot }$ M dwarf near the Galactic Bulge. This analysis demonstrates that Galactic priors are useful to resolve this type of model degeneracy. This is important for estimating the mass-ratio function statistically. However, this method would be unlikely successful in shorter timescale events, which are mostly due to low-mass objects, like brown dwarfs or free-floating planets. Therefore, careful treatment is needed for estimating the mass-ratio function of the companions around such low-mass hosts, which only the microlensing can probe.
Fichier principal
Vignette du fichier
Miyazaki_2022_AJ_163_123.pdf (2.29 Mo) Télécharger le fichier
Origin Publisher files allowed on an open archive

Dates and versions

insu-03748293 , version 1 (09-08-2022)

Licence

Identifiers

Cite

Shota Miyazaki, Daisuke Suzuki, Andrzej Udalski, Naoki Koshimoto, David P. Bennett, et al.. OGLE-2014-BLG-0319: A Sub-Jupiter-mass Planetary Event Encountered Degeneracy with Different Mass Ratios and Lens-source Relative Proper Motions. The Astronomical Journal, 2022, 163, ⟨10.3847/1538-3881/ac4960⟩. ⟨insu-03748293⟩
8 View
19 Download

Altmetric

Share

Gmail Mastodon Facebook X LinkedIn More