Probable brown dwarf companions detected in binary microlensing events during the 2018-2020 seasons of the KMTNet survey
arXiv:2305.06605 · doi:10.1051/0004-6361/202245455
Abstract
We inspect the microlensing data of the KMTNet survey collected during the 2018--2020 seasons in order to find lensing events produced by binaries with brown-dwarf companions. In order to pick out binary-lens events with candidate BD lens companions, we conduct systematic analyses of all anomalous lensing events observed during the seasons. By applying the selection criterion with mass ratio between the lens components of , we identify four binary-lens events with candidate BD companions, including KMT-2018-BLG-0321, KMT-2018-BLG-0885, KMT-2019-BLG-0297, and KMT-2019-BLG-0335. For the individual events, we present the interpretations of the lens systems and measure the observables that can constrain the physical lens parameters. The masses of the lens companions estimated from the Bayesian analyses based on the measured observables indicate that the probabilities for the lens companions to be in the brown-dwarf mass regime are high: 59\%, 68\%, 66\%, and 66\% for the four events respectively.
10 pages, 8 figures
References in corpus (25)
- 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
- 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
- OGLE-2003-BLG-262: Finite-Source Effects from a Point-Mass Lens
- The Use of High Magnification Microlensing Events in Discovering Extra-solar Planets
- How Dry is the Brown Dwarf Desert?: Quantifying the Relative Number of Planets, Brown Dwarfs and Stellar Companions around Nearby Sun-like Stars
- A Jovian-mass Planet in Microlensing Event OGLE-2005-BLG-071
- A Natural Formalism for Microlensing
- Difference imaging photometry of blended gravitational microlensing events with a numerical kernel
- The Luminosity Function and Mass Function in the Galactic Bulge
- MOA-2011-BLG-293Lb: A test of pure survey microlensing planet detections
- Stellar Contribution to the Galactic Bulge Microlensing Optical Depth
- 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
- Korea Microlensing Telescope Network Microlensing Events from 2015: Event-Finding Algorithm, Vetting, and Photometry
- The frequency of snowline-region planets from four-years of OGLE-MOA-Wise second-generation microlensing
- Gravitational lens under perturbations: Symmetry of perturbing potentials with invariant caustics
- OGLE-2018-BLG-0567Lb and OGLE-2018-BLG-0962Lb: Two Microlensing Planets through Planetary-Caustic Channel
- Systematic KMTNet Planetary Anomaly Search. V. Complete Sample of 2018 Prime-Field
- An alternative parameterisation for binary-lens caustic-crossing events
- Microlensing Parallax for OGLE-2017-BLG-0896 Reveals a Counter-Rotating Low-Mass Brown Dwarf
- Candidate Brown-dwarf Microlensing Events with Very Short Timescales and Small Angular Einstein Radii
- ROME/REA: A gravitational microlensing search for exo-planets beyond the snow-line on a global network of robotic telescopes
- Brown-dwarf companions in microlensing binaries detected during the 2016--2018 seasons