Systematic KMTNet Planetary Anomaly Search. VI. Complete Sample of 2018 Sub-Prime-Field Planets

Abstract

We complete the analysis of all 2018 sub-prime-field microlensing planets identified by the KMTNet AnomalyFinder. Among the 9 previously unpublished events with clear planetary solutions, 6 are clearly planetary (KMT-2018-BLG-0030, KMT-2018-BLG-0087, KMT-2018-BLG-0247, OGLE-2018-BLG-0298, KMT-2018-BLG-2602, and OGLE-2018-BLG-1119), while the remaining 3 are ambiguous in nature. In addition, there are 8 previously published sub-prime field planets that were selected by the AnomalyFinder algorithm. Together with a companion paper (Gould et al. 2022) on 2018 prime-field planets, this work lays the basis for the first statistical analysis of the planet mass-ratio function based on planets identified in KMTNet data. As expected (Zhu et al. 2014), half (17/33) of the 2018 planets likely to enter the mass-ratio analysis have non-caustic-crossing anomalies. However, only 1 of the 5 non-caustic anomalies with planet-host mass ratio $q<10^{-3}$ was discovered by eye (compared to 7 of the 12 with $q>10^{-3}$), showing the importance of the semi-automated AnomalyFinder search.

arXiv comment56 pages, 13 tables, 14 figures, submitted to AAS Journals

References in corpus (43)

• Gaia Data Release 2. Summary of the contents and survey properties
• The Gaia mission
• A method for optimal image subtraction
• VISTA Variables in the Via Lactea (VVV): The public ESO near-IR variability survey of the Milky Way
• Reddening and Extinction Toward the Galactic Bulge from OGLE-III: The Inner Milky Way's Rv ~ 2.5 Extinction Curve
• 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
• Frequency of Solar-Like Systems and of Ice and Gas Giants Beyond the Snow Line from High-Magnification Microlensing Events in 2005-2008
• The Exoplanet Mass-Ratio Function from the MOA-II Survey: Discovery of a Break and Likely Peak at a Neptune Mass
• Expanding the Realm of Microlensing Surveys with Difference Image Photometry
• Difference imaging photometry of blended gravitational microlensing events with a numerical kernel
• The DECam Plane Survey: Optical photometry of two billion objects in the southern Galactic plane
• Planet Parameters in Microlensing Events
• 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
• A classifier for spurious astrometric solutions in Gaia EDR3
• Criteria for Sample Selection to Maximize Planet Sensitivity and Yield from Space-Based Microlens Parallax Surveys
• Predictions for Microlensing Planetary Events from Core Accretion Theory
• Optimal Survey Strategies and Predicted Planet Yields for the Korean Microlensing Telescope Network
• MOA 2003-BLG-37: A Bulge Jerk-Parallax Microlens Degeneracy
• Systematic KMTNet Planetary Anomaly Search, Paper I: OGLE-2019-BLG-1053Lb, A Buried Terrestrial Planet
• OGLE-2018-BLG-0567Lb and OGLE-2018-BLG-0962Lb: Two Microlensing Planets through Planetary-Caustic Channel
• 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. IV. Complete Sample of 2019 Prime-Field
• Masses for Free-Floating Planets and Dwarf Planets
• Mass Production of 2021 KMTNet Microlensing Planets I
• OGLE-2015-BLG-0479LA,B: Binary Gravitational Microlens Characterized by Simultaneous Ground-based and Space-based Observation
• Systematic KMTNet Planetary Anomaly Search, Paper III: One Wide-Orbit Planet And Two Stellar Binaries
• Spectroscopic Mass and Host-star Metallicity Measurements for Newly Discovered Microlensing Planet OGLE-2018-BLG-0740Lb
• Three microlensing planets with no caustic-crossing features
• $Spitzer$ Parallax of OGLE-2018-BLG-0596: A Low-mass-ratio Planet around an M-dwarf
• A Mathematical Treatment of the Offset Microlensing Degeneracy
• KMT-2019-BLG-0371 and the Limits of Bayesian Analysis
• KMT-2018-BLG-1743: Planetary Microlensing Event Occurring on Two Source Stars
• KMT-2018-BLG-1990Lb: A Nearby Jovian Planet From A Low-Cadence Microlensing Field
• KMT-2018-BLG-1292: A Super-Jovian Microlens Planet in the Galactic Plane
• OGLE-2018-BLG-1269Lb: A Jovian Planet With A Bright, $I=16$ Host
• Shortest Microlensing Event with a Bound Planet: KMT-2016-BLG-2605
• OGLE-2018-BLG-0799Lb: a $q\sim 2.7\times 10^{-3}$ Planet with Spitzer Parallax
• OGLE-2018-BLG-1428Lb: a Jupiter-mass planet beyond the snow line of a dwarf star

Cited by in corpus (3)

• Systematic KMTNet Planetary Anomaly Search, Paper VII: Complete Sample of $q<10^{-4}$ Planets from the First Four-Year Survey
• Mass Production of 2021 KMTNet Microlensing Planets II
• Simulations of Triple Microlensing Events I: Detectability of a scaled Sun-Jupiter-Saturn System