OGLE-2018-BLG-0584 and KMT-2018-BLG-2119: two microlensing events with two lens masses and two source stars
arXiv:2212.13019 · doi:10.1051/0004-6361/202245525
Abstract
We conduct a systematic investigation of the microlensing data collected during the previous observation seasons for the purpose of reanalyzing anomalous lensing events with no suggested plausible models. We find that two anomalous lensing events OGLE-2018-BLG-0584 and KMT-2018-BLG-2119 cannot be explained with the usual models based on either a binary-lens single-source (2L1S) or a single-lens binary-source (1L2S) interpretation. We test the feasibility of explaining the light curves with more sophisticated models by adding an extra lens (3L1S model) or a source (2L2S model) component to the 2L1S lens-system configuration. We find that a 2L2S interpretation well explains the light curves of both events, for each of which there are a pair of solutions resulting from the close and wide degeneracy. For the event OGLE-2018-BLG-0584, the source is a binary composed of two K-type stars, and the lens is a binary composed of two M dwarfs. For KMT-2018-BLG-2119, the source is a binary composed of two dwarfs of G and K spectral types, and the lens is a binary composed of a low-mass M dwarf and a brown dwarf.
arXiv comment9 pages, 9 figures
References in corpus (39)
- Possible Gravitational Microlensing of a Star in the Large Magellanic Cloud
- 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
- Discovery of a Jupiter/Saturn Analog with Gravitational Microlensing
- Detecting Earth-Mass Planets with Gravitational Microlensing
- Difference imaging photometry of blended gravitational microlensing events with a numerical kernel
- MOA-2011-BLG-293Lb: A test of pure survey microlensing planet detections
- Stellar Contribution to the Galactic Bulge Microlensing Optical Depth
- Masses and Orbital Constraints for the OGLE-2006-BLG-109Lb,c Jupiter/Saturn Analog Planetary System
- Korea Microlensing Telescope Network Microlensing Events from 2015: Event-Finding Algorithm, Vetting, and Photometry
- The First Circumbinary Planet Found by Microlensing: OGLE-2007-BLG-349L(AB)c
- Microlensing by Multiple Planets in High Magnification Events
- Triple Microlens OGLE-2008-BLG-092L: Binary Stellar System with a Circumprimary Uranus-type Planet
- Gravitational lens under perturbations: Symmetry of perturbing potentials with invariant caustics
- The second multiple-planet system discovered by microlensing: OGLE-2012-BLG-0026Lb, c, a pair of jovian planets beyond the snow line
- Einstein Radii from Binary Lensing Events
- Revisiting the microlensing event OGLE 2012-BLG-0026: A solar mass star with two cold giant planets
- Properties of Microlensing Light Curve Anomalies Induced by Multiple Planets
- Interpretation of a Short-Term Anomaly in the Gravitational Microlensing Event MOA-2012-BLG-486
- OGLE-2018-BLG-0567Lb and OGLE-2018-BLG-0962Lb: Two Microlensing Planets through Planetary-Caustic Channel
- Critical Curves and Caustics of Triple-lens Models
- OGLE-2016-BLG-0613LABb: A Microlensing Planet in a Binary System
- OGLE-2018-BLG-1011L\lowercase{b,c}: Microlensing Planetary System with Two Giant Planets Orbiting a Low-mass Star
- OGLE-2018-BLG-1700L: Microlensing Planet in Binary Stellar System
- The First Planetary Microlensing Event with Two Microlensed Source Stars
- Triple-lens Gravitational Microlensing: Critical Curves for Arbitrary Spatial Configuration
- Image-plane Analysis of n-point-mass Lens Critical Curves and Caustics
- KMT-2021-BLG-1077L: The fifth confirmed multiplanetary system detected by microlensing
- OGLE-2016-BLG-1003: First Resolved Caustic-crossing Binary-source Event Discovered by Second-generation Microlensing Surveys
- A Gas Giant Planet in the OGLE-2006-BLG-284L Stellar Binary System
- KMT-2019-BLG-1715: planetary microlensing event with three lens masses and two source stars
- KMT-2021-BLG-1898: Planetary microlensing event involved with binary source stars
- KMT-2019-BLG-0797: binary-lensing event occurring on a binary stellar system
- KMT-2018-BLG-1743: Planetary Microlensing Event Occurring on Two Source Stars
- Brown-dwarf companions in microlensing binaries detected during the 2016--2018 seasons
- KMT-2021-BLG-1122L: The first microlensing triple stellar system