UKIRT-2017-BLG-001Lb: A giant planet detected through the dust

Abstract

We report the discovery of a giant planet in event UKIRT-2017-BLG-001, detected by the UKIRT microlensing survey. The mass ratio between the planet and its host is $q=1.50_{-0.14}^{+0.17}\times 10^{-3}$, about 1.5 times the Jupiter/Sun mass ratio. The event lies 0.35${}^{\circ }$ from the Galactic center and suffers from high extinction of $A_K=1.68$. Therefore, it could be detected only by a near-infrared survey. The field also suffers from large spatial differential extinction, which makes it difficult to estimate the source properties required to derive the angular Einstein radius. Nevertheless, we find evidence suggesting that the source is located in the far disk. If correct, this would be the first source star of a microlensing event to be identified as belonging to the far disk. We estimate the lens mass and distance using a Bayesian analysis to find that the planet's mass is $1.28_{-0.44}^{+0.37}{M}_J$, and it orbits a $0.81_{-0.27}^{+0.21}{M}_{\odot }$ star at an instantaneous projected separation of $4.18_{-0.88}^{+0.96}$ AU. The system is at a distance of $6.3_{-2.1}^{+1.6}$ kpc, and so likely resides in the Galactic bulge. In addition, we find a non-standard extinction curve in this field, in agreement with previous results toward high-extinction fields near the Galactic center.

arXiv comment27 pages, 8 figures, 2 tables. Accepted for publication in ApJ Letters

References in corpus (57)

• PARSEC: stellar tracks and isochrones with the PAdova and TRieste Stellar Evolution Code
• Correcting for the Effects of Interstellar Extinction
• MESA Isochrones and Stellar Tracks (MIST). I: Solar-Scaled Models
• MESA Isochrones and Stellar Tracks (MIST) 0: Methods for the construction of stellar isochrones
• The Milky Way Tomography with SDSS: I. Stellar Number Density Distribution
• Color Transformations for the 2MASS Second Incremental Data Release
• A new generation of PARSEC-COLIBRI stellar isochrones including the TP-AGB phase
• VISTA Variables in the Via Lactea (VVV): The public ESO near-IR variability survey of the Milky Way
• Modelling the Galactic Interstellar Extinction Distribution in Three Dimensions
• 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
• Unbound or Distant Planetary Mass Population Detected by Gravitational Microlensing
• Towards a deterministic model of planetary formation. III. Mass distribution of short-period planets around stars of various masses
• The angular size of dwarf stars and subgiants - Surface brightness relations calibrated by interferometry
• A Three-Dimensional Map of Milky-Way Dust
• The UKIRT Wide Field Camera ZYJHK Photometric System: Calibration from 2MASS
• 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
• Interstellar Extinction Law toward the Galactic Center III: J, H, Ks bands in the 2MASS and the MKO systems, and 3.6, 4.5, 5.8, 8.0 micron in the Spitzer/IRAC system
• No large population of unbound or wide-orbit Jupiter-mass planets
• The Exoplanet Mass-Ratio Function from the MOA-II Survey: Discovery of a Break and Likely Peak at a Neptune Mass
• MOA-2011-BLG-293Lb: A test of pure survey microlensing planet detections
• Stellar Contribution to the Galactic Bulge Microlensing Optical Depth
• Lifting the Dusty Veil With Near- and Mid-Infrared Photometry: I. Description and Applications of the Rayleigh-Jeans Color Excess Method
• Simulation of a Space-Based Microlensing Survey for Terrestrial Extra-Solar Planets
• 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
• The DECam Plane Survey: Optical photometry of two billion objects in the southern Galactic plane
• Spitzer as Microlens Parallax Satellite: Mass Measurement for the OGLE-2014-BLG-0124L Planet and its Host Star
• Korea Microlensing Telescope Network Microlensing Events from 2015: Event-Finding Algorithm, Vetting, and Photometry
• Extended-Source Effect and Chromaticity in Two-Point-Mass Microlensing
• Hexadecapole Approximation in Planetary Microlensing
• Interstellar Extinction Curve Variations Toward the Inner Milky Way: A Challenge to Observational Cosmology
• Pathway to the Galactic Distribution of Planets: Combined Spitzer and Ground-Based Microlens Parallax Measurements of 21 Single-Lens Events
• A New Photometric Model of the Galactic Bar using Red Clump Giants
• Kinematics at the Edge of the Galactic Bulge: Evidence for Cylindrical Rotation
• The frequency of snowline-region planets from four-years of OGLE-MOA-Wise second-generation microlensing
• ExELS: an exoplanet legacy science proposal for the ESA Euclid mission I. Cold exoplanets
• Statistics Of Microlensing Optical Depth
• Extinction ratios in the inner Galaxy as revealed by the VVV survey
• Toward a Galactic Distribution of Planets. I. Methodology & Planet Sensitivities of the 2015 High-Cadence Spitzer Microlens Sample
• Point Sources from a Spitzer IRAC Survey of the Galactic Center
• The second multiple-planet system discovered by microlensing: OGLE-2012-BLG-0026Lb, c, a pair of jovian planets beyond the snow line
• Red clump stars and Gaia: Calibration of the standard candle using a hierarchical probabilistic model
• Optimal Survey Strategies and Predicted Planet Yields for the Korean Microlensing Telescope Network
• A Second Method to Photometrically Align Multi-Site Microlensing Light Curves: Source Color in Planetary Event MOA-2007-BLG-192
• Constraints on Planetary Companions in the Magnification A=256 Microlensing Event: OGLE-2003-BLG-423
• MOA-2011-BLG-322Lb: a "second generation survey" microlensing planet
• Using M Dwarf Spectra to Map Extinction in the Local Galaxy
• Is the Galactic bulge devoid of planets?
• MOA-2016-BLG-227Lb: A Massive Planet Characterized by Combining Lightcurve Analysis and Keck AO Imaging
• Lifting the Dusty Veil With Near- and Mid-Infrared Photometry: III. Two-Dimensional Extinction Maps of the Galactic Midplane Using the Rayleigh-Jeans Color Excess Method
• UKIRT microlensing surveys as a pathfinder for $WFIRST$: The detection of five highly extinguished low-$|b|$ events
• The Star Blended with the MOA-2008-BLG-310 Source Is Not the Exoplanet Host Star
• Besançon Galactic model analysis of MOA-II microlensing: evidence for a mass deficit in the inner bulge
• Combining Spitzer parallax and Keck II adaptive optics imaging to measure the mass of a solar-like star orbited by a cold gaseous planet discovered by microlensing
• K Band Microlensing of the Inner Galaxy

Cited by in corpus (15)

• Predictions of the WFIRST Microlensing Survey I: Bound Planet Detection Rates
• Prediction of Planet Yields by the PRime-focus Infrared Microlensing Experiment Microlensing Survey
• A Planetary Microlensing Event with an Unusually Red Source Star: MOA-2011-BLG-291
• VVV WIN 1733$-$3349: a low extinction window to probe the far side of the Milky Way bulge
• OGLE-2017-BLG-1186: first application of asteroseismology and Gaussian processes to microlensing
• Optical Alignment Method for the PRIME Telescope
• VVV Survey Microlensing: the Galactic Latitude Dependence
• OGLE-2015-BLG-1670Lb: A Cold Neptune beyond the Snow Line in the Provisional WFIRST Microlensing Survey Field
• VVV Survey Microlensing: Catalog of Best and Forsaken Events
• KMT-2018-BLG-1292: A Super-Jovian Microlens Planet in the Galactic Plane
• The Prime Focus Infrared Microlensing Experiment (PRIME): First Results
• VVV survey microlensing: candidate events with source in the far disk
• White Paper: Exoplanetary Microlensing from the Ground in the 2020s
• A Near-Infrared Extinction and Reddening Map Towards the Galactic Bulge Using UKIRT
• The Galactic Center with Roman