OGLE-2016-BLG-0693LB: Probing the Brown Dwarf Desert with Microlensing

Abstract

We present an analysis of microlensing event OGLE-2016-BLG-0693, based on the survey-only microlensing observations by the OGLE and KMTNet groups. In order to analyze the light curve, we consider the effects of parallax, orbital motion, and baseline slope, and also refine the result using a Galactic model prior. From the microlensing analysis, we find that the event is a binary composed of a low-mass brown dwarf 49+-20 M_J companion and a K- or G-dwarf host, which lies at a distance 5.0+-0.6 kpc toward the Galactic bulge. The projected separation between the brown dwarf and its host star is less than 5 AU, and thus it is likely that the brown dwarf companion is located in the brown dwarf desert.

arXiv comment27 pages, 7 figures, 4 tables, Accepted for publication in AJ

References in corpus (39)

• A Survey of Stellar Families: Multiplicity of Solar-Type Stars
• The Galactic disk mass function: reconciliation of the HST and nearby determinations
• The Theory of Brown Dwarfs and Extrasolar Giant Planets
• 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
• 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 angular size of dwarf stars and subgiants - Surface brightness relations calibrated by interferometry
• 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
• The Exoplanet Mass-Ratio Function from the MOA-II Survey: Discovery of a Break and Likely Peak at a Neptune Mass
• Resolution of the MACHO-LMC-5 Puzzle: The Jerk-Parallax Microlens Degeneracy
• MOA-2011-BLG-293Lb: A test of pure survey microlensing planet detections
• Stellar Contribution to the Galactic Bulge Microlensing Optical Depth
• OGLE-2005-BLG-071Lb, the Most Massive M-Dwarf Planetary Companion?
• MOA-2009-BLG-387Lb: A massive planet orbiting an M dwarf
• Discovering Galactic Planets by Gravitational Microlensing: Magnification Patterns and Light Curves
• The Extreme Microlensing Event OGLE-2007-BLG-224: Terrestrial Parallax Observation of a Thick-Disk Brown Dwarf
• Systematic Analysis of 22 Microlensing Parallax Candidates
• Extended-Source Effect and Chromaticity in Two-Point-Mass Microlensing
• Hexadecapole Approximation in Planetary Microlensing
• The frequency of snowline-region planets from four-years of OGLE-MOA-Wise second-generation microlensing
• Limb-Darkening of a K Giant in the Galactic Bulge: PLANET Photometry of MACHO 97-BLG-28
• An Earth-mass Planet in a 1-AU Orbit around an Ultracool Dwarf
• M Dwarfs from Hubble Space Telescope Star Counts. IV
• Microlensing Discovery of a Tight, Low Mass-ratio Planetary-mass Object around an Old, Field Brown Dwarf
• OGLE-2013-BLG-0102LA,B: Microlensing binary with components at star/brown-dwarf and brown-dwarf/planet boundaries
• Mass Measurements of Isolated Objects from Space-based Microlensing
• Microlensing Discovery of a Population of Very Tight, Very Low-mass Binary Brown Dwarfs
• MOA-2007-BLG-197: Exploring the brown dwarf desert
• MOA-2010-BLG-073L: An M-Dwarf with a Substellar Companion at the Planet/Brown Dwarf Boundary
• OGLE-2015-BLG-1482L: the first isolated low-mass microlens in the Galactic bulge
• Gravitational Binary-lens Events with Prominent Effects of Lens Orbital Motion
• First simultaneous microlensing observations by two space telescopes: $Spitzer$ & $Swift$ reveal a brown dwarf in event OGLE-2015-BLG-1319
• OGLE-2015-BLG-0479LA,B: Binary Gravitational Microlens Characterized by Simultaneous Ground-based and Space-based Observation
• 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
• Microlensing Binaries Discovered through High-Magnification Channel
• OGLE-2013-BLG-0578L: Microlensing Binary Composed of A Brown Dwarf And An M Dwarf

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• Spitzer Microlensing of MOA-2016-BLG-231L : A Counter-Rotating Brown Dwarf Binary in the Galactic Disk
• The GAPS Programme at TNG LXVIII. Characterization of the outer substellar companion around HD 72659 with a multi-technique approach