Precision measurement of a brown dwarf mass in a binary system in the microlensing event OGLE-2019-BLG-0033/MOA-2019-BLG-035
arXiv:2203.04034 · doi:10.1051/0004-6361/202243490
Abstract
Context. Brown dwarfs are poorly understood transition objects between stars and planets, with several competing mechanisms having been proposed for their formation. Mass measurements are generally difficult for isolated objects but also for brown dwarfs orbiting low-mass stars, which are often too faint for spectroscopic follow-up. Aims. Microlensing provides an alternative tool for the discovery and investigation of such faint systems. Here we present the analysis of the microlensing event OGLE-2019-BLG-0033/MOA-2019-BLG-035, which is due to a binary system composed of a brown dwarf orbiting a red dwarf. Methods. Thanks to extensive ground observations and the availability of space observations from Spitzer, it has been possible to obtain accurate estimates of all microlensing parameters, including parallax, source radius and orbital motion of the binary lens. Results. After accurate modeling, we find that the lens is composed of a red dwarf with mass and a brown dwarf with mass , at a projected separation of au. The system has a peculiar velocity that is typical of old metal-poor populations in the thick disk. Percent precision in the mass measurement of brown dwarfs has been achieved only in a few microlensing events up to now, but will likely become common with the Roman space telescope.
arXiv comment13 pages, 6 figures
References in corpus (81)
- The Gaia mission
- A method for optimal image subtraction
- A Non-Gray Theory of Extrasolar Giant Planets and Brown Dwarfs
- Reddening and Extinction Toward the Galactic Bulge from OGLE-III: The Inner Milky Way's Rv ~ 2.5 Extinction Curve
- Real-Time Difference Imaging Analysis of MOA Galactic Bulge Observations During 2000
- The angular size of dwarf stars and subgiants - Surface brightness relations calibrated by interferometry
- OGLE-2003-BLG-262: Finite-Source Effects from a Point-Mass Lens
- How Dry is the Brown Dwarf Desert?: Quantifying the Relative Number of Planets, Brown Dwarfs and Stellar Companions around Nearby Sun-like Stars
- No large population of unbound or wide-orbit Jupiter-mass planets
- The NIRSPEC Brown Dwarf Spectroscopic Survey. I. Low-Resolution Near-Infrared Spectra
- The Gemini Deep Planet Survey -- GDPS
- The Deuterium-Burning Mass Limit for Brown Dwarfs and Giant Planets
- A Low-Mass Planet with a Possible Sub-Stellar-Mass Host in Microlensing Event MOA-2007-BLG-192
- Predictions of the WFIRST Microlensing Survey I: Bound Planet Detection Rates
- The Formation of Low-Mass Binary Star Systems Via Turbulent Fragmentation
- Expanding the Realm of Microlensing Surveys with Difference Image Photometry
- A Natural Formalism for Microlensing
- Microlensing optical depth towards the Galactic bulge from MOA observations during 2000 with Difference Image Analysis
- The Solar Neighborhood XXXVII: The Mass-Luminosity Relation for Main Sequence M Dwarfs
- Search for brown-dwarf companions of stars
- A New Algorithm For Difference Image Analysis
- Chemical evolution of the Galactic bulge as traced by microlensed dwarf and subgiant stars. IV. Two bulge populations
- Binary microlensing event OGLE-2009-BLG-020 gives a verifiable mass, distance and orbit predictions
- MOA-2009-BLG-387Lb: A massive planet orbiting an M dwarf
- First microlens mass measurement: PLANET photometry of EROS BLG-2000-5
- IAC-Star: a Code for Synthetic Color-Magnitude Diagram Computation
- The Extreme Microlensing Event OGLE-2007-BLG-224: Terrestrial Parallax Observation of a Thick-Disk Brown Dwarf
- The Substellar Mass Function in sigma Orionis
- 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
- The Wide Brown Dwarf Binary Oph 1622-2405 and Discovery of A Wide, Low Mass Binary in Ophiuchus (Oph 1623-2402): A New Class of Young Evaporating Wide Binaries?
- Acceleration and Parallax Effects in Gravitational Microlensing
- Constraining the masses of microlensing black holes and the mass gap with Gaia DR2
- Predictions of the Nancy Grace Roman Space Telescope Galactic Exoplanet Survey II: Free-Floating Planet Detection Rates
- LHS6343C: A Transiting Field Brown Dwarf Discovered by the Kepler Mission
- Difference Image Analysis: Extension to a Spatially Varying Photometric Scale Factor and Other Considerations
- A rich population of free-floating planets in the Upper Scorpius young stellar association
- 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
- VBBinaryLensing: a public package for microlensing light curve computation
- Chemical evolution of the Galactic bulge as traced by microlensed dwarf and subgiant stars. II. Ages, metallicities, detailed elemental abundances, and connections to the Galactic thick disc
- The Lowest Mass Ratio Planetary Microlens: OGLE 2016-BLG-1195Lb
- A Jovian analogue orbiting a white dwarf star
- A high binary fraction for the most massive close-in giant planets and brown dwarf desert members
- High Precision Astrometry with MICADO at the European Extremely Large Telescope
- Microlensing Discovery of a Tight, Low Mass-ratio Planetary-mass Object around an Old, Field Brown Dwarf
- Stochastical distributions of lens and source properties for observed galactic microlensing events
- WFIRST Exoplanet Mass Measurement Method Finds a Planetary Mass of for OGLE-2012-BLG-0950Lb
- A terrestrial-mass rogue planet candidate detected in the shortest-timescale microlensing event
- NLTT 41135: a field M-dwarf + brown dwarf eclipsing binary in a triple system, discovered by the MEarth observatory
- Deuterium burning in objects forming via the core accretion scenario - Brown dwarfs or planets?
- First Resolution of Microlensed Images
- Spitzer Follow-up of Extremely Cold Brown Dwarfs Discovered by the Backyard Worlds: Planet 9 Citizen Science Project
- The Two-Colour EMCCD Instrument for the Danish 1.54m Telescope and SONG
- Microlensing Discovery of a Population of Very Tight, Very Low-mass Binary Brown Dwarfs
- MOA-2007-BLG-197: Exploring the brown dwarf desert
- A sub-Saturn Mass Planet, MOA-2009-BLG-319Lb
- A Parametric Galactic Model toward the Galactic Bulge Based on Gaia and Microlensing Data
- Direct radio discovery of a cold brown dwarf
- The asymmetric drift, the local standard of rest, and implications from RAVE data
- Analytic Models of Brown Dwarfs and The Substellar Mass Limit
- KMT-2019-BLG-2073: Fourth Free-Floating-Planet Candidate with $θ_\rm E < 10 \rmμas$
- The Surface Densities of Disk Brown Dwarfs in JWST Surveys
- First simultaneous microlensing observations by two space telescopes: & reveal a brown dwarf in event OGLE-2015-BLG-1319
- OGLE-2008-BLG-510: first automated real-time detection of a weak microlensing anomaly - brown dwarf or stellar binary?
- Microlensig Binaries with Candidate Brown Dwarf Companions
- Cheap Space-Based Microlens Parallaxes for High-Magnification Events
- Measurement of Source Star Colors with the K2C9-CFHT Multi-color Microlensing Survey
- MOA-2010-BLG-311: A planetary candidate below the threshold of reliable detection
- Expectations on the mass determination using astrometric microlensing by Gaia
- A public code for astrometric microlensing with contour integration
- Detection of brown dwarf-like objects in the core of NGC3603
- OGLE-2016-BLG-1045: A Test of Cheap Space-Based Microlens Parallaxes
- Direct Lens Imaging of Galactic Bulge Microlensing Events
- Evidence of Systematic Errors in Microlens Parallax Measurements
- OGLE-2016-BLG-1266: A Probable Brown-Dwarf/Planet Binary at the Deuterium Fusion Limit
- Chemical evolution of the Galactic bulge as traced by microlensed dwarf and subgiant stars. VIII. Carbon and oxygen
- Revealing Short-period Exoplanets and Brown Dwarfs in the Galactic Bulge using the Microlensing Xallarap Effect with the \textit{Nancy Grace Roman Space Telescope}
- Shortest Microlensing Event with a Bound Planet: KMT-2016-BLG-2605
- OGLE-2016-BLG-1093Lb: A Sub-Jupiter-mass Spitzer Planet Located in Galactic Bulge
- Identification of stellar-mass black hole binaries and the validity of linear orbital motion approximation in microlensing