MOA-bin-29b : A Microlensing Gas Giant Planet Orbiting a Low-mass Host Star

Abstract

We report the discovery of a gas giant planet orbiting a low-mass host star in the microlensing event MOA-bin-29 that occurred in 2006. We find five degenerate solutions with the planet/host-star mass ratio of $q\sim 10^{-2}$. The Einstein radius crossing time of all models are relatively short ($\sim 4-7$ days), which indicates that the mass of host star is likely low. The measured lens-source proper motion is $5-9$ $\mathrm{mas}{\mathrm{yr}}^{-1}$ depending on the models. Since only finite source effects are detected, we conduct a Bayesian analysis in order to obtain the posterior probability distribution of the lens physical properties. As a result, we find the lens system is likely to be a gas giant orbiting a brown dwarf or a very late M-dwarf in the Galactic bulge. The probability distributions of the physical parameters for the five degenerate models are consistent within the range of error. By combining these probability distributions, we conclude that the lens system is a gas giant with a mass of $M_{\mathrm{p}}=0.63_{-0.39}^{+1.13}{M}_{\mathrm{Jup}}$ orbiting a brown dwarf with a mass of $M_{\mathrm{h}}=0.06_{-0.04}^{+0.11}{M}_{\odot }$ at a projected star-planet separation of $r_{\perp }=0.53_{-0.18}^{+0.89}\mathrm{au}$. The lens distance is $D_{\mathrm{L}}=6.89_{-1.19}^{+1.19}\mathrm{kpc}$, i.e., likely within the Galactic bulge.

arXiv comment26 pages, 16 figures, 5 tables. Accepted for publication in AJ

References in corpus (70)

• The James Webb Space Telescope
• Evolutionary models for cool brown dwarfs and extrasolar giant planets. The case of HD 20945
• Detection of Planetary Transits Across a Sun-like Star
• Planetary Candidates Observed by Kepler, III: Analysis of the First 16 Months of Data
• Characteristics of planetary candidates observed by Kepler, II: Analysis of the first four months of data
• Catalog of Nearby Exoplanets
• Discovery of a Cool Planet of 5.5 Earth Masses Through Gravitational Microlensing
• Reddening and Extinction Toward the Galactic Bulge from OGLE-III: The Inner Milky Way's Rv ~ 2.5 Extinction Curve
• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Parameter Estimation Methodology
• The formation and retention of gas giant planets around stars with a range of metallicities
• Real-Time Difference Imaging Analysis of MOA Galactic Bulge Observations During 2000
• Unbound or Distant Planetary Mass Population Detected by Gravitational Microlensing
• Chemical evolution of the Galactic bulge as traced by microlensed dwarf and subgiant stars. V. Evidence for a wide age distribution and a complex MDF
• Core-Accretion Model Predicts Few Jovian-Mass Planets Orbiting Red Dwarfs
• OGLE-2003-BLG-262: Finite-Source Effects from a Point-Mass Lens
• A new implementation of the infrared flux method using the 2MASS catalogue
• The Use of High Magnification Microlensing Events in Discovering Extra-solar Planets
• OGLE 2003-BLG-235/MOA 2003-BLG-53: A planetary microlensing event
• Microlens OGLE-2005-BLG-169 Implies Cool Neptune-Like Planets are Common
• Detecting Earth-Mass Planets with Gravitational Microlensing
• The HARPS search for Earth-like planets in the habitable zone: I -- Very low-mass planets around HD20794, HD85512 and HD192310
• A Low-Mass Planet with a Possible Sub-Stellar-Mass Host in Microlensing Event MOA-2007-BLG-192
• The Exoplanet Mass-Ratio Function from the MOA-II Survey: Discovery of a Break and Likely Peak at a Neptune Mass
• The Luminosity Function and Mass Function in the Galactic Bulge
• Microlensing optical depth towards the Galactic bulge from MOA observations during 2000 with Difference Image Analysis
• A Cold Neptune-Mass Planet OGLE-2007-BLG-368Lb: Cold Neptunes Are Common
• Stellar Contribution to the Galactic Bulge Microlensing Optical Depth
• The Mass Spectrum Of Machos From Parallax Measurements
• A Sub-Earth-Mass Moon Orbiting a Gas Giant Primary or a High Velocity Planetary System in the Galactic Bulge
• MOA-cam3: a wide-field mosaic CCD camera for a gravitational microlensing survey in New Zealand
• Rapid Formation of Gas Giant Planets around M Dwarf Stars
• Stellar Diameters and Temperatures IV. Predicting Stellar Angular Diameters
• Identification of the OGLE-2003-BLG-235/MOA-2003-BLG-53 Planetary Host Star
• Microlensing with advanced contour integration algorithm: Green's theorem to third order, error control, optimal sampling and limb darkening
• Characterization of Gravitational Microlensing Planetary Host Stars
• Sub-Saturn Planet MOA-2008-BLG-310Lb: Likely To Be In The Galactic Bulge
• Discovery and Mass Measurements of a Cold, 10-Earth Mass Planet and Its Host Star
• Spitzer Parallax of OGLE-2015-BLG-0966: A Cold Neptune in the Galactic Disk
• An Efficient Method for Modeling High Magnification Planetary Microlensing Events
• Observations of the Binary Microlens Event MACHO-98-SMC-1 by the Microlensing Planet Search Collaboration
• Criteria for Sample Selection to Maximize Planet Sensitivity and Yield from Space-Based Microlens Parallax Surveys
• Planetary and Other Short Binary Microlensing Events from the MOA Short Event Analysis
• An Earth-mass Planet in a 1-AU Orbit around an Ultracool Dwarf
• Planetary Microlensing at High Magnification
• MOA-2011-BLG-293Lb: First Microlensing Planet possibly in the Habitable Zone
• OGLE-2012-BLG-0563Lb: a Saturn-mass Planet around an M Dwarf with the Mass Constrained by Subaru AO imaging
• Planet formation around low mass stars: the moving snow line and super-Earths
• The Lowest Mass Ratio Planetary Microlens: OGLE 2016-BLG-1195Lb
• A frozen super-Earth orbiting a star at the bottom of the Main Sequence
• Microlensing Discovery of a Tight, Low Mass-ratio Planetary-mass Object around an Old, Field Brown Dwarf
• Campaign 9 of the $K2$ Mission: Observational Parameters, Scientific Drivers, and Community Involvement for a Simultaneous Space- and Ground-based Microlensing Survey
• Optimal Survey Strategies and Predicted Planet Yields for the Korean Microlensing Telescope Network
• WFIRST Exoplanet Mass Measurement Method Finds a Planetary Mass of $39\pm 8M_{\oplus }$ for OGLE-2012-BLG-0950Lb
• MOA-2011-BLG-322Lb: a "second generation survey" microlensing planet
• OGLE-2017-BLG-1522: A giant planet around a brown dwarf located in the Galactic bulge
• Is the Galactic bulge devoid of planets?
• MOA-2010-BLG-073L: An M-Dwarf with a Substellar Companion at the Planet/Brown Dwarf Boundary
• MOA-2016-BLG-227Lb: A Massive Planet Characterized by Combining Lightcurve Analysis and Keck AO Imaging
• The Star Blended with the MOA-2008-BLG-310 Source Is Not the Exoplanet Host Star
• OGLE-2011-BLG-0265Lb: a Jovian Microlensing Planet Orbiting an M Dwarf
• Characterizing Lenses and Lensed Stars of High-Magnification Single-lens Gravitational Microlensing Events With Lenses Passing Over Source Stars
• MOA 2011-BLG-028Lb: a Neptune-mass Microlensing Planet in the Galactic Bulge
• OGLE-2015-BLG-0051/KMT-2015-BLG-0048Lb: a Giant Planet Orbiting a Low-mass Bulge Star Discovered by High-cadence Microlensing Surveys
• KMT-2016-BLG-1820 and KMT-2016-BLG-2142: Two Microlensing Binaries Composed of Planetary-mass Companions and Very-Low-Mass Primaries
• An ice giant exoplanet interpretation of the anomaly in microlensing event OGLE-2011-BLG-0173
• Spitzer Microlensing of MOA-2016-BLG-231L : A Counter-Rotating Brown Dwarf Binary in the Galactic Disk
• Kmt-2016-blg-1397b: Kmtnet-only discovery of a microlens giant planet
• OGLE-2016-BLG-1266: A Probable Brown-Dwarf/Planet Binary at the Deuterium Fusion Limit
• MOA Data Reveal a New Mass, Distance, and Relative Proper Motion for Planetary System OGLE-2015-BLG-0954L
• MOA-2012-BLG-505Lb: A super-Earth mass planet probably in the Galactic bulge

Cited by in corpus (9)

• OGLE-2015-BLG-1771Lb: A Microlens Planet Orbiting an Ultracool Dwarf?
• A Gas Giant Planet in the OGLE-2006-BLG-284L Stellar Binary System
• KMT-2019-BLG-0371 and the Limits of Bayesian Analysis
• MOA-2006-BLG-074: recognizing xallarap contaminants in planetary microlensing
• Giant planet swaps during close stellar encounters
• Shortest Microlensing Event with a Bound Planet: KMT-2016-BLG-2605
• KMT-2022-BLG-2397: Brown Dwarf at the Upper Shore of the Einstein Desert
• Binary-lens Microlensing Degeneracy: Impact on Planetary Sensitivity and Mass-ratio Function
• New Giant Planet beyond the Snow Line for an Extended MOA Exoplanet Microlens Sample