MOA-2019-BLG-008Lb: a new microlensing detection of an object at the planet/brown dwarf boundary
arXiv:2205.07522 · doi:10.3847/1538-3881/ac78ed
Abstract
We report on the observations, analysis and interpretation of the microlensing event MOA-2019- BLG-008. The observed anomaly in the photometric light curve is best described through a binary lens model. In this model, the source did not cross caustics and no finite source effects were observed. Therefore the angular Einstein ring radius cannot be measured from the light curve alone. However, the large event duration, t E about 80 days, allows a precise measurement of the microlensing parallax. In addition to the constraints on the angular radius and the apparent brightness I s of the source, we employ the Besancon and GalMod galactic models to estimate the physical properties of the lens. We find excellent agreement between the predictions of the two Galactic models: the companion is likely a resident of the brown dwarf desert with a mass Mp about 30 MJup and the host is a main sequence dwarf star. The lens lies along the line of sight to the Galactic Bulge, at a distance of less then4 kpc. We estimate that in about 10 years, the lens and source will be separated by 55 mas, and it will be possible to confirm the exact nature of the lensing system by using high-resolution imaging from ground or space-based observatories.
arXiv commentAccepted in AJ
References in corpus (134)
- emcee: The MCMC Hammer
- On the variation of the Initial Mass Function
- The Gaia mission
- Binary companions of evolved stars in APOGEE DR14: Search method and catalog of ~5,000 companions
- Intrinsic Colors, Temperatures, and Bolometric Corrections of Pre-Main Sequence Stars
- A method for optimal image subtraction
- The PLATO 2.0 Mission
- Las Cumbres Observatory Global Telescope Network
- Wide-Field InfrarRed Survey Telescope-Astrophysics Focused Telescope Assets WFIRST-AFTA 2015 Report
- Towards a Deterministic Model of Planetary Formation I: a Desert in the Mass and Semi Major Axis Distributions of Extra Solar Planets
- Gaia Early Data Release 3: Photometric content and validation
- Gaia Data Release 2: Photometric content and validation
- Planet-disk interaction and orbital evolution
- Global survey of star clusters in the Milky Way II. The catalogue of basic parameters
- Modelling the Galactic Interstellar Extinction Distribution in Three Dimensions
- Models of Giant Planet formation with migration and disc evolution
- The HARPS search for southern extra-solar planets XXXI. The M-dwarf sample
- Reddening and Extinction Toward the Galactic Bulge from OGLE-III: The Inner Milky Way's Rv ~ 2.5 Extinction Curve
- One or more bound planets per Milky Way star from microlensing observations
- Extrasolar planet population synthesis I: Method, formation tracks and mass-distance distribution
- Real-Time Difference Imaging Analysis of MOA Galactic Bulge Observations During 2000
- 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
- The Gemini Planet Imager Exoplanet Survey: Giant Planet and Brown Dwarf Demographics From 10-100 AU
- OGLE-2003-BLG-262: Finite-Source Effects from a Point-Mass Lens
- The Formation Mechanism of Brown Dwarfs
- How Dry is the Brown Dwarf Desert?: Quantifying the Relative Number of Planets, Brown Dwarfs and Stellar Companions around Nearby Sun-like Stars
- Frequency of Solar-Like Systems and of Ice and Gas Giants Beyond the Snow Line from High-Magnification Microlensing Events in 2005-2008
- Microlens OGLE-2005-BLG-169 Implies Cool Neptune-Like Planets are Common
- The Gemini Deep Planet Survey -- GDPS
- Predictions of the WFIRST Microlensing Survey I: Bound Planet Detection Rates
- Expanding the Realm of Microlensing Surveys with Difference Image Photometry
- A Natural Formalism for Microlensing
- Fundamental Properties of Stars using Asteroseismology from Kepler & CoRoT and Interferometry from the CHARA Array
- Stellar Diameters and Temperatures III. Main Sequence A, F, G, & K Stars: Additional high-precision measurements and empirical relations
- Difference imaging photometry of blended gravitational microlensing events with a numerical kernel
- Resolution of the MACHO-LMC-5 Puzzle: The Jerk-Parallax Microlens Degeneracy
- Stellar populations in the Milky Way bulge region : Towards solving the Galactic bulge and bar shapes using 2MASS data
- MOA-2011-BLG-293Lb: A test of pure survey microlensing planet detections
- The Formation and Early Evolution of Low-mass Stars and Brown Dwarfs
- Microlensing optical depth towards the Galactic bulge from MOA observations during 2000 with Difference Image Analysis
- The Palomar/Keck Adaptive Optics Survey of Young Solar Analogs: Evidence for a Universal Companion Mass Function
- Mapping the Shores of the Brown Dwarf Desert I.: Upper Scorpius
- Stellar Contribution to the Galactic Bulge Microlensing Optical Depth
- Stellar Diameters and Temperatures I. Main Sequence A, F, & G Stars
- A New Algorithm For Difference Image Analysis
- First Observation of Parallax in a Gravitational Microlensing Event
- OGLE-2005-BLG-071Lb, the Most Massive M-Dwarf Planetary Companion?
- Binary microlensing event OGLE-2009-BLG-020 gives a verifiable mass, distance and orbit predictions
- Population-Level Eccentricity Distributions of Imaged Exoplanets and Brown Dwarf Companions: Dynamical Evidence for Distinct Formation Channels
- MOA-2009-BLG-387Lb: A massive planet orbiting an M dwarf
- 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
- Detection of Rotation in a Binary Microlens: PLANET Photometry of MACHO 97-BLG-41
- MOA-cam3: a wide-field mosaic CCD camera for a gravitational microlensing survey in New Zealand
- Constraining the thick disc formation scenario of the Milky Way
- Directly Determined Linear Radii and Effective Temperatures of Exoplanet Host Stars
- The Blue Tip of the Stellar Locus: Measuring Reddening with the SDSS
- The diameters of Alpha Centauri A and B - A comparison of the asteroseismic and VINCI/VLTI views
- The Substellar Mass Function in sigma Orionis
- Stellar Diameters and Temperatures IV. Predicting Stellar Angular Diameters
- The Besancon Galaxy model renewed I. Constraints on the local star formation history from Tycho data
- OGLE-IV: Fourth Phase of the Optical Gravitational Lensing Experiment
- Systematic Analysis of 22 Microlensing Parallax Candidates
- Microlensing with advanced contour integration algorithm: Green's theorem to third order, error control, optimal sampling and limb darkening
- Acceleration and Parallax Effects in Gravitational Microlensing
- Pathway to the Galactic Distribution of Planets: Combined Spitzer and Ground-Based Microlens Parallax Measurements of 21 Single-Lens Events
- Predictions of the Nancy Grace Roman Space Telescope Galactic Exoplanet Survey II: Free-Floating Planet Detection Rates
- Optical and Infrared Colors of Stars Observed by 2MASS and SDSS
- ExELS: an exoplanet legacy science proposal for the ESA Euclid mission I. Cold exoplanets
- CHARA Array Measurements of the Angular Diameters of Exoplanet Host Stars
- The Dynamical Mass and Three-Dimensional Orbit of HR7672B: A Benchmark Brown Dwarf with High Eccentricity
- Difference Image Analysis: Extension to a Spatially Varying Photometric Scale Factor and Other Considerations
- Microlensing optical depth and event rate toward the Galactic bulge from 8 yr of OGLE-IV observations
- Criteria for Sample Selection to Maximize Planet Sensitivity and Yield from Space-Based Microlens Parallax Surveys
- The radius and mass of the close solar twin 18 Sco derived from asteroseismology and interferometry
- VBBinaryLensing: a public package for microlensing light curve computation
- Synthesizing Exoplanet Demographics: A Single Population of Long-Period Planetary Companions to M Dwarfs Consistent with Microlensing, Radial Velocity, and Direct Imaging Surveys
- The CHARA Array Angular Diameter of HR 8799 Favors Planetary Masses for Its Imaged Companions
- The diameter and evolutionary state of Procyon A
- MOA-2011-BLG-293Lb: First Microlensing Planet possibly in the Habitable Zone
- Exploring the Local Milky Way: M Dwarfs as Tracers of Galactic Populations
- Empirical photometric calibration of the Gaia Red Clump: colours, effective temperature and absolute magnitude
- The Lowest Mass Ratio Planetary Microlens: OGLE 2016-BLG-1195Lb
- Evolution over time of the Milky Way's disc shape
- First Space-based Microlens Parallax Measurement of an Isolated Star: Spitzer Observations of OGLE-2014-BLG-0939
- MOA-2010-BLG-477Lb: constraining the mass of a microlensing planet from microlensing parallax, orbital motion and detection of blended light
- OGLE-2003-BLG-238: Microlensing Mass Estimate of an Isolated Star
- OGLE small amplitude red giant variables in the Galactic Bar
- Kinematics of the local disk from the RAVE survey and the Gaia first data release
- Stochastical distributions of lens and source properties for observed galactic microlensing events
- A terrestrial-mass rogue planet candidate detected in the shortest-timescale microlensing event
- Predicting Stellar Angular Diameters from , , , Photometry
- The interferometric diameter and internal structure of Sirius A
- VLTI/VINCI diameter constraints on the evolutionary status of delta Eri, xi Hya, eta Boo
- The detection and characterisation of 54 massive companions with the SOPHIE spectrograph -- 7 new brown dwarfs and constraints on the BD desert
- Interpretation of a Short-Term Anomaly in the Gravitational Microlensing Event MOA-2012-BLG-486
- Two intermediate-mass transiting brown dwarfs from the TESS mission
- Mass Measurements of Isolated Objects from Space-based Microlensing
- The VLT/NaCo large program to probe the occurrence of exoplanets and brown dwarfs at wide orbits. III. The frequency of brown dwarfs and giant planets as companions to solar-type stars
- Is the Galactic bulge devoid of planets?
- MOA-2007-BLG-197: Exploring the brown dwarf desert
- A new interferometric study of four exoplanet host stars : θ Cygni, 14 Andromedae, {\upsilon} Andromedae and 42 Draconis
- Three-dimensional interferometric, spectrometric, and planetary views of Procyon
- The diameter of the CoRoT target HD 49933. Combining the 3D limb darkening, asteroseismology, and interferometry
- High precision microlensing maps of the Galactic bulge
- Quasi integral of motion for axisymmetric potentials
- A Parametric Galactic Model toward the Galactic Bulge Based on Gaia and Microlensing Data
- Besançon Galactic model analysis of MOA-II microlensing: evidence for a mass deficit in the inner bulge
- The VMC survey -- XXXVIII. Proper motion of the Magellanic Bridge
- Microlensing Parallax for OGLE-2017-BLG-0896 Reveals a Counter-Rotating Low-Mass Brown Dwarf
- A Short, Non-Planetary, Microlensing Anomaly: Observations and Lightcurve Analysis of MACHO 99-BLG-47
- Simulating JWST deep extragalactic imaging surveys and physical parameter recovery
- Combining Spitzer parallax and Keck II adaptive optics imaging to measure the mass of a solar-like star orbited by a cold gaseous planet discovered by microlensing
- Stellar populations in the CFHTLS. I. New constraints on the IMF at low mass
- OGLE-2008-BLG-510: first automated real-time detection of a weak microlensing anomaly - brown dwarf or stellar binary?
- A companion on the planet/brown dwarf mass boundary on a wide orbit discovered by gravitational microlensing
- Spiral arm kinematics for Milky Way stellar populations
- The OGLE-III planet detection efficiency from six years of microlensing observations (2003 to 2008)
- The 2L1S/1L2S Degeneracy for Two Microlensing Planet Candidates Discovered by the KMTNet Survey in 2017
- GalMod: a Galactic synthesis population model
- OGLE-2014-BLG-0257L: A Microlensing Brown Dwarf Orbiting a Low-mass M Dwarf
- ROME/REA: A gravitational microlensing search for exo-planets beyond the snow-line on a global network of robotic telescopes
- First assessment of the binary lens OGLE-2015_BLG-0232
- MaBlS-2: high-precision microlensing modelling for the large-scale survey era
- OGLE-2014-BLG-1186: gravitational microlensing providing evidence for a planet orbiting the foreground star or for a close binary source?
- OGLE-2018-BLG-0022: A Nearby M-dwarf Binary
- OGLE-2013-BLG-0911Lb: A Secondary on the Brown-Dwarf Planet Boundary around an M-dwarf
- OGLE-2014-BLG-0289: Precise Characterization of a Quintuple-Peak Gravitational Microlensing Event
- The California Legacy Survey II. Occurrence of Giant Planets Beyond the Ice line
- Comparing Observed Stellar Kinematics and Surface Densities in a Low Latitude Bulge Field to Galactic Population Synthesis Models
- Variability and stellar populations with deep optical-IR images of the Milky Way disk: matching VVV with VLT/VIMOS data
- Using binary statistics in Taurus-Auriga to distinguish between brown dwarf formation processes
- Long-Period High-Amplitude Red Variables in the KELT Survey
- Theory of multiple-stellar population synthesis in a non-Hamiltonian setting