OGLE-2019-BLG-1470LABc: Another Microlensing Giant Planet in a Binary System?

Abstract

We report the discovery and analysis of a candidate triple-lens single-source (3L1S) microlensing event, OGLE-2019-BLG-1470. This event was first classified as a normal binary-lens single-source (2L1S) event, but a careful 2L1S modelling showed that it needs an additional lens or source to fit the observed data. It is found that the 3L1S model provides the best fit, but the binary-lens binary-source (2L2S) model is only disfavoured by $\Delta {\chi }^2\simeq 18$. All of the feasible models include a planet with planet-to-host mass-ratios $10^{-3}\lesssim q\lesssim 10^{-2}$. A Bayesian analysis based on a Galactic model indicates that the planet is super-Jovian, and the projected host-planet separation is about 3 $\mathrm{au}$. Specifically, for the best-fit 3L1S model, the two stars have masses of $M_1=0.57_{-0.32}^{+0.43}{M}_{\odot }$, and $M_2=0.18_{-0.10}^{+0.15}{M}_{\odot }$, with projected separation of $1.3_{-0.5}^{+0.5}$ $\mathrm{au}$, and the planetary mass is $M_3=2.2_{-1.3}^{+1.8}{M}_{\mathrm{Jupiter}}$. For the 2L2S model, the masses of the host star and the planet are $0.55_{-0.31}^{+0.44}{M}_{\odot }$ and $4.6_{-2.6}^{+3.7}{M}_{\mathrm{Jupiter}}$, respectively. By investigating the properties of all known microlensing planets in binary systems, we find that all planets in binary systems published by the KMTNet survey are located inside the resonant caustics range with $q\gtrsim 2\times 10^{-3}$, indicating the incompleteness of the KMTNet sample for planets in binary systems. Thus, planets in binary systems cannot be included in the current study of the KMTNet mass-ratio function, and a systematic search for planetary anomalies in KMTNet microlensing light curves of binary systems is needed.

arXiv comment17 pages, 14 figures, published in MNRAS

References in corpus (101)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• emcee: The MCMC Hammer
• On the variation of the Initial Mass Function
• A method for optimal image subtraction
• Stellar Multiplicity
• Mind your Ps and Qs: the Interrelation between Period (P) and Mass-ratio (Q) Distributions of Binary Stars
• Wide-Field InfrarRed Survey Telescope-Astrophysics Focused Telescope Assets WFIRST-AFTA 2015 Report
• Long-Term Stability of Planets in Binary Systems
• Kepler-16: A Transiting Circumbinary Planet
• 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
• 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
• OGLE-2003-BLG-262: Finite-Source Effects from a Point-Mass Lens
• Kepler-47: A Transiting Circumbinary Multi-Planet System
• Discovery of a Jupiter/Saturn Analog with Gravitational Microlensing
• Frequency of Solar-Like Systems and of Ice and Gas Giants Beyond the Snow Line from High-Magnification Microlensing Events in 2005-2008
• A Planetary Companion to gamma Cephei A
• Data analysis recipes: Using Markov Chain Monte Carlo
• Detecting Earth-Mass Planets with Gravitational Microlensing
• The Exoplanet Mass-Ratio Function from the MOA-II Survey: Discovery of a Break and Likely Peak at a Neptune Mass
• Predictions of the WFIRST Microlensing Survey I: Bound Planet Detection Rates
• Expanding the Realm of Microlensing Surveys with Difference Image Photometry
• A Natural Formalism for Microlensing
• The CORALIE survey for southern extra-solar planets. XII. Orbital solutions for 16 extra-solar planets discovered with CORALIE
• The Impact of Stellar Multiplicity on Planetary Systems, I.: The Ruinous Influence of Close Binary Companions
• Difference imaging photometry of blended gravitational microlensing events with a numerical kernel
• MOA-2011-BLG-293Lb: A test of pure survey microlensing planet detections
• A New Algorithm For Difference Image Analysis
• OGLE-2005-BLG-071Lb, the Most Massive M-Dwarf Planetary Companion?
• 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
• Planetary Detection Efficiency of the Magnification 3000 Microlensing Event OGLE-2004-BLG-343
• Masses and Orbital Constraints for the OGLE-2006-BLG-109Lb,c Jupiter/Saturn Analog Planetary System
• Extrasolar planets in stellar multiple systems
• Finite Source Sizes and the Information Content of MACHO-Type Lens Search Light Curves
• Microlensing Event MOA-2007-BLG-400: Exhuming the Buried Signature of a Cool, Jovian-Mass Planet
• Planet formation is unlikely in equal mass binary systems with a ~ 50 AU
• Systematic Analysis of 22 Microlensing Parallax Candidates
• Korea Microlensing Telescope Network Microlensing Events from 2015: Event-Finding Algorithm, Vetting, and Photometry
• Extended-Source Effect and Chromaticity in Two-Point-Mass Microlensing
• Microlensing with advanced contour integration algorithm: Green's theorem to third order, error control, optimal sampling and limb darkening
• Hexadecapole Approximation in Planetary Microlensing
• On the Abundance of Circumbinary Planets
• The Degree of Alignment Between Circumbinary Disks and Their Binary Hosts
• The First Circumbinary Planet Found by Microlensing: OGLE-2007-BLG-349L(AB)c
• A Terrestrial Planet in a ~1 AU Orbit Around One Member of a ~15 AU Binary
• Properties of Central Caustics in Planetary Microlensing
• Simulations of eccentric disks in close binary systems
• Triple Microlens OGLE-2008-BLG-092L: Binary Stellar System with a Circumprimary Uranus-type Planet
• An M Dwarf Companion and Its Induced Spiral Arms in the HD 100453 Protoplanetary Disk
• VBBinaryLensing: a public package for microlensing light curve computation
• Planetary Microlensing at High Magnification
• Inclination Evolution of Protoplanetary Disks Around Eccentric Binaries
• Toward a Galactic Distribution of Planets. I. Methodology & Planet Sensitivities of the 2015 High-Cadence Spitzer Microlens Sample
• Direct detection of exoplanet host star companion gamma Cep B and revised masses for both stars and the sub-stellar object
• Planet formation in Alpha Centauri A revisited: not so accretion-friendly after all
• The ELODIE survey for northern extra-solar planets IV. HD196885, a close binary star with a 3.7-year planet
• The second multiple-planet system discovered by microlensing: OGLE-2012-BLG-0026Lb, c, a pair of jovian planets beyond the snow line
• A Substellar Companion to the Intermediate-Mass Giant 11 Com
• On the Likelihood of Planet Formation in Close Binaries
• OGLE-2003-BLG-238: Microlensing Mass Estimate of an Isolated Star
• Properties of Microlensing Light Curve Anomalies Induced by Multiple Planets
• Planet formation in binaries: dynamics of planetesimals perturbed by the eccentric protoplanetary disk and the secondary
• Predicting Stellar Angular Diameters from $V$, $I_C$, $H$, $K$ Photometry
• Planet formation in Binaries
• Planet formation in stellar binaries I: planetesimal dynamics in massive protoplanetary disks
• Systematic KMTNet Planetary Anomaly Search, Paper I: OGLE-2019-BLG-1053Lb, A Buried Terrestrial Planet
• Interpretation of a Short-Term Anomaly in the Gravitational Microlensing Event MOA-2012-BLG-486
• Planet formation in small separation binaries: not so excited after all
• The First Neptune Analog or Super-Earth with Neptune-like Orbit: MOA-2013-BLG-605Lb
• Influence of the circumbinary disk gravity on planetesimal accumulation in the Kepler 16 system
• Systematic KMTNet Planetary Anomaly Search, Paper II: Six New $q<2\times 10^{-4}$ Mass-ratio Planets
• MOA-2016-BLG-227Lb: A Massive Planet Characterized by Combining Lightcurve Analysis and Keck AO Imaging
• Systematic KMTNet Planetary Anomaly Search. V. Complete Sample of 2018 Prime-Field
• Systematic KMTNet Planetary Anomaly Search. IV. Complete Sample of 2019 Prime-Field
• The first stages of planet formation in binary systems: How far can dust coagulation proceed?
• OGLE-2016-BLG-0613LABb: A Microlensing Planet in a Binary System
• Analysis of Microlensing Light Curves Induced by Multiple-Planet Systems
• Caustic Structures and Detectability of Circumbinary Planets in Microlensing
• OGLE-2018-BLG-1700L: Microlensing Planet in Binary Stellar System
• Transiting Planets near the Snow Line from Kepler. I. Catalog
• Detection Probability of a Low-Mass Planet for Triple Lens Events: Implication of Properties of Binary-Lens Superposition
• Dynamics of Circumstellar Disks III: The case of GG Tau A
• Systematic KMTNet Planetary Anomaly Search, Paper III: One Wide-Orbit Planet And Two Stellar Binaries
• Effect of a wide binary companion to the lens on the astrometric behavior of gravitational microlensing events
• Planet formation in stellar binaries: Global simulations of planetesimal growth
• OGLE-2015-BLG-1771Lb: A Microlens Planet Orbiting an Ultracool Dwarf?
• Near-Infrared Imaging Polarimetry of Inner Region of GG Tau A Disk
• Searching for Small Circumbinary Planets I. The STANLEY Automated Algorithm and No New Planets in Existing Systems
• A Likely Detection of a Two-Planet System in a Low Magnification Microlensing Event
• Microlensing Predictions: Impact of Galactic Disc Dynamical Models
• 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-0842Lb: A Cold Planet Below the Uranus/Sun Mass Ratio
• KMT-2019-BLG-1715: planetary microlensing event with three lens masses and two source stars
• Long-term stability of planets in and around binary stars
• Light Curve Calculations for Triple Microlensing Systems
• A Pair of Planets Likely in Mean-motion Resonance From Gravitational Microlensing
• OGLE-2019-BLG-0304: Competing Interpretations between a Planet-binary Model and a Binary-source + Binary-lens model
• High-Resolution Near-Infrared Polarimetry and Sub-Millimeter Imaging of FS Tau A: Possible Streamers in Misaligned Circumbinary Disk System

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• KMT-2021-BLG-1122L: The first microlensing triple stellar system
• Apparently ultra-long period radio sources from self-lensed pulsar-black hole binaries
• Simulations of Triple Microlensing Events I: Detectability of a scaled Sun-Jupiter-Saturn System