Systematic KMTNet Planetary Anomaly Search, Paper VII: Complete Sample of $q<10^{-4}$ Planets from the First Four-Year Survey

Abstract

We present the analysis of seven microlensing planetary events with planet/host mass ratios $q<10^{-4}$: KMT-2017-BLG-1194, KMT-2017-BLG-0428, KMT-2019-BLG-1806, KMT-2017-BLG-1003, KMT-2019-BLG-1367, OGLE-2017-BLG-1806, and KMT-2016-BLG-1105. They were identified by applying the Korea Microlensing Telescope Network (KMTNet) AnomalyFinder algorithm to 2016--2019 KMTNet events. A Bayesian analysis indicates that all the lens systems consist of a cold super-Earth orbiting an M or K dwarf. Together with 17 previously published and three that will be published elsewhere, AnomalyFinder has found a total of 27 planets that have solutions with $q<10^{-4}$ from 2016--2019 KMTNet events, which lays the foundation for the first statistical analysis of the planetary mass-ratio function based on KMTNet data. By reviewing the 27 planets, we find that the missing planetary caustics problem in the KMTNet planetary sample has been solved by AnomalyFinder. We also find a desert of high-magnification planetary signals ($A\gtrsim 65$), and a follow-up project for KMTNet high-magnification events could detect at least two more $q<10^{-4}$ planets per year and form an independent statistical sample.

arXiv commentAJ in press

References in corpus (65)

• emcee: The MCMC Hammer
• 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
• 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
• 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
• Frequency of Solar-Like Systems and of Ice and Gas Giants Beyond the Snow Line from High-Magnification Microlensing Events in 2005-2008
• Microlens OGLE-2005-BLG-169 Implies Cool Neptune-Like Planets are Common
• A Low-Mass Planet with a Possible Sub-Stellar-Mass Host in Microlensing Event MOA-2007-BLG-192
• Predictions of the WFIRST Microlensing Survey I: Bound Planet Detection Rates
• 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
• A Natural Formalism for Microlensing
• Difference imaging photometry of blended gravitational microlensing events with a numerical kernel
• Resolution of the MACHO-LMC-5 Puzzle: The Jerk-Parallax Microlens Degeneracy
• The Luminosity Function and Mass Function in the Galactic Bulge
• A Cold Neptune-Mass Planet OGLE-2007-BLG-368Lb: Cold Neptunes Are Common
• 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
• The thermal structure and the location of the snow line in the protosolar nebula: axisymmetric models with full 3-D radiative transfer
• First microlens mass measurement: PLANET photometry of EROS BLG-2000-5
• MOA-cam3: a wide-field mosaic CCD camera for a gravitational microlensing survey in New Zealand
• Planet Parameters in Microlensing Events
• Systematic Analysis of 22 Microlensing Parallax Candidates
• Korea Microlensing Telescope Network Microlensing Events from 2015: Event-Finding Algorithm, Vetting, and Photometry
• Microlensing with advanced contour integration algorithm: Green's theorem to third order, error control, optimal sampling and limb darkening
• Interstellar Extinction Curve Variations Toward the Inner Milky Way: A Challenge to Observational Cosmology
• Discovery and Mass Measurements of a Cold, 10-Earth Mass Planet and Its Host Star
• Theory of Pixel Lensing
• An Earth-mass Planet in a 1-AU Orbit around an Ultracool Dwarf
• VBBinaryLensing: a public package for microlensing light curve computation
• Toward a Galactic Distribution of Planets. I. Methodology & Planet Sensitivities of the 2015 High-Cadence Spitzer Microlens Sample
• The Lowest Mass Ratio Planetary Microlens: OGLE 2016-BLG-1195Lb
• OGLE-2003-BLG-238: Microlensing Mass Estimate of an Isolated Star
• Predictions for Microlensing Planetary Events from Core Accretion Theory
• Optimal Survey Strategies and Predicted Planet Yields for the Korean Microlensing Telescope Network
• WFIRST Exoplanet Mass Measurement Method Finds a Planetary Mass of $39\pm 8M_{\oplus }$ for OGLE-2012-BLG-0950Lb
• Predicting Stellar Angular Diameters from $V$, $I_C$, $H$, $K$ Photometry
• 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
• 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
• Systematic KMTNet Planetary Anomaly Search. VI. Complete Sample of 2018 Sub-Prime-Field Planets
• OGLE-2017-BLG-0173Lb: Low Mass-Ratio Planet in a "Hollywood" Microlensing Event
• A Ubiquitous Unifying Degeneracy in Two-Body Microlensing Systems
• OGLE-2017-BLG-1434Lb: Eighth q < 1 * 10^-4 Mass-Ratio Microlens Planet Confirms Turnover in Planet Mass-Ratio Function
• Mass Production of 2021 KMTNet Microlensing Planets I
• Systematic KMTNet Planetary Anomaly Search, Paper III: One Wide-Orbit Planet And Two Stellar Binaries
• KMT-2021-BLG-0171Lb and KMT-2021-BLG-1689Lb: Two Microlensing Planets in the KMTNet High-cadence Fields with Followup Observations
• Binary Source Microlensing Event OGLE-2016-BLG-0733: Interpretation of A Long-term Asymmetric Perturbation
• OGLE-2018-BLG-0532Lb: Cold Neptune With Possible Jovian Sibling
• Measuring microlensing parallax via simultaneous observations from Chinese Space Station Telescope and Roman Telescope
• KMT-2019-BLG-0842Lb: A Cold Planet Below the Uranus/Sun Mass Ratio
• KMT-2018-BLG-1025Lb: microlensing super-Earth planet orbiting a low-mass star
• A Mathematical Treatment of the Offset Microlensing Degeneracy
• OGLE-2015-BLG-1670Lb: A Cold Neptune beyond the Snow Line in the Provisional WFIRST Microlensing Survey Field
• MOA-2006-BLG-074: recognizing xallarap contaminants in planetary microlensing
• Four sub-Jovian-mass planets detected by high-cadence microlensing surveys
• OGLE-2017-BLG-1130: The First Binary Gravitational Microlens Detected From Spitzer Only
• OGLE-2018-BLG-0799Lb: a $q\sim 2.7\times 10^{-3}$ Planet with Spitzer Parallax

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• Systematic Reanalysis of KMTNet microlensing events, Paper I: Updates of the Photometry Pipeline and a New Planet Candidate
• Microlensing events indicate that super-Earth exoplanets are common in Jupiter-like orbits
• Prediction of Planet Yields by the PRime-focus Infrared Microlensing Experiment Microlensing Survey
• Systematic KMTNet Planetary Anomaly Search. VIII. Complete Sample of 2019 Subprime Field Planets
• On the suppression of giant planet formation around low-mass stars in clustered environments
• KMT-2022-BLG-0440Lb: A New $q<10^{-4}$ Microlensing Planet with the Central-Resonant Caustic Degeneracy Broken
• The Prime Focus Infrared Microlensing Experiment (PRIME): First Results
• Systematic KMTNet Planetary Anomaly Search. XII. Complete Sample of 2017 Subprime Field Planets
• Exoplanet Occurrence Rates from Microlensing Surveys
• MOA-2022-BLG-249Lb: Nearby microlensing super-Earth planet detected from high-cadence surveys
• Planet Mass Function around M stars at 1-10 au: A Plethora of sub-Earth mass objects
• OGLE-2015-BLG-1609Lb: Sub-jovian planet orbiting a low-mass stellar or brown dwarf host
• The Brown-dwarf Desert Persists as a Mass-ratio Desert around Low-mass Stars
• Binary-lens Microlensing Degeneracy: Impact on Planetary Sensitivity and Mass-ratio Function
• KMT-2021-BLG-1150Lb: Microlensing planet detected through a densely covered planetary-caustic signal