KMT-2018-BLG-1292: A Super-Jovian Microlens Planet in the Galactic Plane

Abstract

We report the discovery of KMT-2018-BLG-1292Lb, a super-Jovian $M_{\mathrm{planet}}=4.5\pm 1.3M_J$ planet orbiting an F or G dwarf $M_{\mathrm{host}}=1.5\pm 0.4M_{\odot }$, which lies physically within ${\cal O}(10\,\pc)$ of the Galactic plane. The source star is a heavily extincted $A_I\sim 5.2$ luminous giant that has the lowest Galactic latitude, $b=-0.28^{\circ }$, of any planetary microlensing event. The relatively blue blended light is almost certainly either the host or its binary companion, with the first explanation being substantially more likely. This blend dominates the light at $I$ band and completely dominates at $R$ and $V$ bands. Hence, the lens system can be probed by follow-up observations immediately, i.e., long before the lens system and the source separate due to their relative proper motion. The system is well characterized despite the low cadence $\Gamma =0.15$--$0.20\mathrm{h}{\mathrm{r}}^{-1}$ of observations and short viewing windows near the end of the bulge season. This suggests that optical microlensing planet searches can be extended to the Galactic plane at relatively modest cost.

arXiv comment35 pages, 3 Tables, 8 figures

References in corpus (32)

• 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
• OGLE-2003-BLG-262: Finite-Source Effects from a Point-Mass Lens
• VVV DR1: The First Data Release of the Milky Way Bulge and Southern Plane from the Near-Infrared ESO Public Survey VISTA Variables in the Via Lactea
• Frequency of Solar-Like Systems and of Ice and Gas Giants Beyond the Snow Line from High-Magnification Microlensing Events in 2005-2008
• A Low-Mass Planet with a Possible Sub-Stellar-Mass Host in Microlensing Event MOA-2007-BLG-192
• 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
• 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
• Reddening and metallicity maps of the Milky Way bulge from VVV and 2MASS II. The complete high resolution extinction map and implications for Bulge studies
• 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
• Triple Microlens OGLE-2008-BLG-092L: Binary Stellar System with a Circumprimary Uranus-type Planet
• Planetary and Other Short Binary Microlensing Events from the MOA Short Event Analysis
• UKIRT microlensing surveys as a pathfinder for $WFIRST$: The detection of five highly extinguished low-$|b|$ events
• Improved Baade-Wesselink surface-brightness relations
• Microlens Mass Measurement using Triple-Peak Events
• VVV Survey Microlensing Events in the Galactic Center Region
• VVV Survey Microlensing: the Galactic Longitude Dependence
• OGLE-2008-BLG-355Lb: A Massive Planet around A Late type Star
• MOA-2008-BLG-379Lb: A Massive Planet from a High Magnification Event with a Faint Source
• K Band Microlensing of the Inner Galaxy
• UKIRT-2017-BLG-001Lb: A giant planet detected through the dust
• Empirical microlensing event rates predicted by a phenomenological model
• MOA-2010-BLG-353Lb A Possible Saturn Revealed
• OGLE-2016-BLG-1045: A Test of Cheap Space-Based Microlens Parallaxes
• OGLE-2015-BLG-1670Lb: A Cold Neptune beyond the Snow Line in the Provisional WFIRST Microlensing Survey Field
• Triaxiality Inhibitors in N-Body Simulations

Cited by in corpus (8)

• External photoevaporation of circumstellar disks constrains the timescale for planet formation
• Microlensing events indicate that super-Earth exoplanets are common in Jupiter-like orbits
• Systematic KMTNet Planetary Anomaly Search. VI. Complete Sample of 2018 Sub-Prime-Field Planets
• KMT-2019-BLG-2073: Fourth Free-Floating-Planet Candidate with $θ_\rm E < 10 \rmμas$
• Masses for Free-Floating Planets and Dwarf Planets
• OGLE-2018-BLG-1269Lb: A Jovian Planet With A Bright, $I=16$ Host
• KMT-2016-BLG-1836Lb: A Super-Jovian Planet From A High-Cadence Microlensing Field
• An Earth-mass Planet in a Time of Covid-19: KMT-2020-BLG-0414Lb