OGLE-2018-BLG-0567Lb and OGLE-2018-BLG-0962Lb: Two Microlensing Planets through Planetary-Caustic Channel

Abstract

We present the analyses of two microlensing events, OGLE-2018-BLG-0567 and OGLE-2018-BLG-0962. In both events, the short-lasting anomalies were densely and continuously covered by two high-cadence surveys. The light-curve modeling indicates that the anomalies are generated by source crossings over the planetary caustics induced by planetary companions to the hosts. The estimated planet/host separation (scaled to the angular Einstein radius ${\theta }_{\mathrm{E}}$) and mass ratio are $(s,q)=(1.81,1.24\times 10^{-3})$ and $(s,q)=(1.25,2.38\times 10^{-3})$, respectively. From Bayesian analyses, we estimate the host and planet masses as $(M_{\mathrm{h}},M_{\mathrm{p}})=(0.24_{-0.13}^{+0.16}{M}_{\odot },0.32_{-0.16}^{+0.34}{M}_{\mathrm{J}})$ and $(M_{\mathrm{h}},M_{\mathrm{p}})=(0.55_{-0.29}^{+0.32}{M}_{\odot },1.37_{-0.72}^{+0.80}{M}_{\mathrm{J}})$, respectively. These planetary systems are located at a distance of $7.07_{-1.15}^{+0.93}\mathrm{kpc}$ for OGLE-2018-BLG-0567 and $6.47_{-1.73}^{+1.04}\mathrm{kpc}$ for OGLE-2018-BLG-0962, suggesting that they are likely to be near the Galactic bulge. The two events prove the capability of current high-cadence surveys for finding planets through the planetary-caustic channel. We find that most published planetary-caustic planets are found in Hollywood events in which the source size strongly contributes to the anomaly cross section relative to the size of the caustic.

arXiv comment25 pages, 8 figures, 4 tables, submitted to AAS journal

References in corpus (50)

• Gaia Data Release 2. Summary of the contents and survey properties
• The Gaia mission
• Intrinsic Colors, Temperatures, and Bolometric Corrections of Pre-Main Sequence Stars
• A method for optimal image subtraction
• Discovery of a Cool Planet of 5.5 Earth Masses Through Gravitational Microlensing
• Reddening and Extinction Toward the Galactic Bulge from OGLE-III: The Inner Milky Way's Rv ~ 2.5 Extinction Curve
• The formation and retention of gas giant planets around stars with a range of metallicities
• Real-Time Difference Imaging Analysis of MOA Galactic Bulge Observations During 2000
• Planet formation around stars of various masses: The snow line and the frequency of giant planets
• 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
• OGLE 2003-BLG-235/MOA 2003-BLG-53: A planetary microlensing event
• 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 Jovian-mass Planet in Microlensing Event OGLE-2005-BLG-071
• Expanding the Realm of Microlensing Surveys with Difference Image Photometry
• 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
• OGLE-2005-BLG-071Lb, the Most Massive M-Dwarf Planetary Companion?
• 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
• Korea Microlensing Telescope Network Microlensing Events from 2015: Event-Finding Algorithm, Vetting, and Photometry
• Properties of Planetary Caustics in Gravitational Microlensing
• 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
• On Planetary Companions to the MACHO-98-BLG-35 Microlens Star
• Planetary and Other Short Binary Microlensing Events from the MOA Short Event Analysis
• The Microlensing Event Rate and Optical Depth Toward the Galactic Bulge from MOA-II
• Probable Gravitational Microlensing towards the Galatic Bulge
• OGLE-2017-BLG-1522: A giant planet around a brown dwarf located in the Galactic bulge
• OGLE-2013-BLG-0102LA,B: Microlensing binary with components at star/brown-dwarf and brown-dwarf/planet boundaries
• The First Neptune Analog or Super-Earth with Neptune-like Orbit: MOA-2013-BLG-605Lb
• OGLE-2017-BLG-0173Lb: Low Mass-Ratio Planet in a "Hollywood" Microlensing Event
• A companion on the planet/brown dwarf mass boundary on a wide orbit discovered by gravitational microlensing
• A Likely Detection of a Two-Planet System in a Low Magnification Microlensing Event
• MOA-2010-BLG-353Lb A Possible Saturn Revealed
• MOA 2011-BLG-028Lb: a Neptune-mass Microlensing Planet in the Galactic Bulge
• Binary Source Microlensing Event OGLE-2016-BLG-0733: Interpretation of A Long-term Asymmetric Perturbation
• $Spitzer$ Parallax of OGLE-2018-BLG-0596: A Low-mass-ratio Planet around an M-dwarf
• OGLE-2016-BLG-1227L: A Wide-separation Planet from a Very Short-timescale Microlensing Event
• OGLE-2016-BLG-0263L\lowercase{b}: Microlensing Detection of a Very Low-mass Binary Companion Through a Repeating Event Channel
• KMT-2016-BLG-1107: A New Hollywood-Planet Close/Wide Degeneracy
• OGLE-2019-BLG-0960Lb: The Smallest Microlensing Planet
• A Wide Orbit Exoplanet OGLE-2012-BLG-0838Lb

Cited by in corpus (25)

• 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
• Systematic KMTNet Planetary Anomaly Search. VI. Complete Sample of 2018 Sub-Prime-Field Planets
• Microlensing events indicate that super-Earth exoplanets are common in Jupiter-like orbits
• Mass Production of 2021 KMTNet Microlensing Planets I
• KMT-2021-BLG-1077L: The fifth confirmed multiplanetary system detected by microlensing
• KMT-2021-BLG-1898: Planetary microlensing event involved with binary source stars
• 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
• Four sub-Jovian-mass planets detected by high-cadence microlensing surveys
• KMT-2021-BLG-0912Lb: A microlensing super Earth around a K-type star
• KMT-2018-BLG-1743: Planetary Microlensing Event Occurring on Two Source Stars
• Brown-dwarf companions in microlensing binaries detected during the 2016--2018 seasons
• Shortest Microlensing Event with a Bound Planet: KMT-2016-BLG-2605
• KMT-2021-BLG-2010Lb, KMT-2022-BLG-0371Lb, and KMT-2022-BLG-1013Lb: Three microlensing planets detected via partially covered signals
• KMT-2017-BLG-0673Lb and KMT-2019-BLG-0414Lb: Two microlensing planets detected in peripheral fields of KMTNet survey
• KMT-2021-BLG-1122L: The first microlensing triple stellar system
• Probable brown dwarf companions detected in binary microlensing events during the 2018-2020 seasons of the KMTNet survey
• MOA-2022-BLG-249Lb: Nearby microlensing super-Earth planet detected from high-cadence surveys
• Mass Production of 2021 KMTNet Microlensing Planets II
• KMT-2021-BLG-1150Lb: Microlensing planet detected through a densely covered planetary-caustic signal
• "Industrial-Scale" Black Hole Selection without a Satellite
• Three faint-source microlensing planets detected via resonant-caustic channel
• KMT-2018-BLG-1988Lb: microlensing super-Earth orbiting a low-mass disk dwarf
• OGLE-2019-BLG-0468Lb,c: two microlensing giant planets around a G-type star