OGLE-2018-BLG-1700L: Microlensing Planet in Binary Stellar System

Abstract

We report the discovery of a planet in a binary that was discovered from the analysis of the microlensing event OGLE-2018-BLG-1700. We identify the triple nature of the lens from the fact that the complex anomaly pattern can be decomposed into two parts produced by two binary-lens events, in which one binary pair has a very low mass ratio of $\sim 0.01$ between the lens components and the other pair has a mass ratio of $\sim 0.3$. We find two sets of degenerate solutions, in which one solution has a projected separation between the primary and its stellar companion less than the angular Einstein radius $\thetae$ (close solution), while the other solution has a separation greater than $\thetae$ (wide solution). From the Bayesian analysis with the constraints of the event time scale and angular Einstein radius together with the location of the source lying in the far disk behind the bulge, we find that the planet is a super-Jupiter with a mass of $4.4_{-2.0}^{+3.0}{M}_{\mathrm{J}}$ and the stellar binary components are early and late M-type dwarfs with masses $0.42_{-0.19}^{+0.29}{M}_{\odot }$ and $0.12_{-0.05}^{+0.08}{M}_{\odot }$, respectively, and the planetary system is located at a distance of $D_{\mathrm{L}}=7.6_{-0.9}^{+1.2}\mathrm{kpc}$. The planet is a circumstellar planet according to the wide solution, while it is a circumbinary planet according to the close solution. The projected primary-planet separation is $2.8_{-2.5}^{+3.2}\mathrm{au}$ commonly for the close and wide solutions, but the primary-secondary binary separation of the close solution, $0.75_{-0.66}^{+0.87}\mathrm{au}$, is widely different from the separation, $10.5_{-9.2}^{+12.1}\mathrm{au}$, of the wide solution.

10 pages, 8 figures

References in corpus (38)

• A method for optimal image subtraction
• The Galactic disk mass function: reconciliation of the HST and nearby determinations
• 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
• The Use of High Magnification Microlensing Events in Discovering Extra-solar Planets
• Discovery of a Jupiter/Saturn Analog with Gravitational Microlensing
• MOA-2011-BLG-293Lb: A test of pure survey microlensing planet detections
• Microlensing optical depth towards the Galactic bulge from MOA observations during 2000 with Difference Image Analysis
• 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
• The Mass Spectrum Of Machos From Parallax Measurements
• Masses and Orbital Constraints for the OGLE-2006-BLG-109Lb,c Jupiter/Saturn Analog Planetary System
• Measuring the Remnant Mass Function of the Galactic Bulge
• 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
• A Terrestrial Planet in a ~1 AU Orbit Around One Member of a ~15 AU Binary
• Triple Microlens OGLE-2008-BLG-092L: Binary Stellar System with a Circumprimary Uranus-type Planet
• The second multiple-planet system discovered by microlensing: OGLE-2012-BLG-0026Lb, c, a pair of jovian planets beyond the snow line
• On the Feasibility of Detecting Satellites of Extrasolar Planets via Microlensing
• 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
• Microlensing Detections of Moons of Exoplanets
• Detectability of extrasolar moons as gravitational microlenses
• 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-2015-BLG-1459L: The Challenges of Exo-Moon Microlensing
• Microlensing Detections of Planets in Binary Stellar Systems
• Triple-lens Gravitational Microlensing: Critical Curves for Arbitrary Spatial Configuration
• A Likely Detection of a Two-Planet System in a Low Magnification Microlensing Event
• Spectroscopic Mass and Host-star Metallicity Measurements for Newly Discovered Microlensing Planet OGLE-2018-BLG-0740Lb
• Space-based Microlens Parallax Observation As a Way to Resolve the Severe Degeneracy between Microlens-parallax and Lens-orbital Effect

Cited by in corpus (21)

• Systematic KMTNet Planetary Anomaly Search, Paper II: Six New $q<2\times 10^{-4}$ Mass-ratio Planets
• Systematic KMTNet Planetary Anomaly Search. V. Complete Sample of 2018 Prime-Field
• Microlensing events indicate that super-Earth exoplanets are common in Jupiter-like orbits
• OGLE-2019-BLG-1470LABc: Another Microlensing Giant Planet in a Binary System?
• 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
• One Planet or Two Planets? The Ultra-sensitive Extreme-magnification Microlensing Event KMT-2019-BLG-1953
• KMT-2021-BLG-1898: Planetary microlensing event involved with binary source stars
• VBMicroLensing: three algorithms for multiple lensing with contour integration
• OGLE-2018-BLG-0584 and KMT-2018-BLG-2119: two microlensing events with two lens masses and two source stars
• KMT-2021-BLG-0240: Microlensing event with a deformed planetary signal
• KMT-2019-BLG-0371 and the Limits of Bayesian Analysis
• KMT-2018-BLG-1743: Planetary Microlensing Event Occurring on Two Source Stars
• KMT-2019-BLG-0797: binary-lensing event occurring on a binary stellar system
• Light Curve Calculations for Triple Microlensing Systems
• KMT-2016-BLG-1836Lb: A Super-Jovian Planet From A High-Cadence Microlensing Field
• KMT-2021-BLG-1122L: The first microlensing triple stellar system
• OGLE-2019-BLG-0304: Competing Interpretations between a Planet-binary Model and a Binary-source + Binary-lens model
• Simulations of Triple Microlensing Events I: Detectability of a scaled Sun-Jupiter-Saturn System
• KMT-2021-BLG-0322: Severe degeneracy between triple-lens and higher-order binary-lens interpretations
• OGLE-2019-BLG-0468Lb,c: two microlensing giant planets around a G-type star