# KMT-2019-BLG-2073: Fourth Free-floating Planet Candidate with θ E < 10 μas

@article{Kim2021KMT2019BLG2073FF,
title={KMT-2019-BLG-2073: Fourth Free-floating Planet Candidate with $\theta$ E < 10 $\mu$as},
author={Hyoun-Woo Kim and Kyu-Ha Hwang and A. Gould and Jennifer C. Yee and Yoon-Hyun Ryu and Michael D. Albrow and Sun-Ju Chung and Cheongho Han and Youn Kil Jung and Chung-Uk Lee and In-Gu Shin and Yossi Shvartzvald and Weicheng Zang and Sang-Mok Cha and Dong-Jin Kim and Seung-Lee Kim and Dong-Joo Lee and Yongseok Lee and Byeong-Gon Park and Richard W. Pogge},
journal={The Astronomical Journal},
year={2021},
volume={162}
}
• Published 14 July 2020
• Physics, Geology
• The Astronomical Journal
We analyze the very short Einstein timescale (t E ≃ 7 hr) event KMT-2019-BLG-2073. Making use of the pronounced finite-source effects generated by the clump giant source, we measure the Einstein radius θ E ≃ 4.8 μas and so infer a mass M=59M⊕(πrel/16μas)−1 , where π rel is the lens-source relative parallax. We find no significant evidence for a host of this planetary-mass object, though one could be present at sufficiently wide separation. If so, it would be detectable after about 10 yr. This…
4 Citations
Free-Floating Planets, the Einstein Desert, and 'Oumuamua
• Physics, Geology
• 2022
: We complete the survey for ﬁnite-source/point-lens (FSPL) giant-source events in 2016-2019 KMTNet microlensing data. The 30 FSPL events show a clear gap in Einstein radius, 9 µ as < θ E < 26 µ as,
A Multiparameter Degeneracy in Microlensing Events with Extreme Finite Source Effects
• Physics, Geology
The Astrophysical Journal
• 2022
For microlenses with sufficiently low mass, the angular radius of the source star can be much larger than the angular Einstein ring radius of the lens. For such extreme finite source effect (EFSE)
Using Source Proper Motion to Validate Terrestrial Parallax: OGLE-2019-BLG-1058
• Physics
The Astronomical Journal
• 2021
We show that because the conditions for producing terrestrial microlens parallax (TPRX; i.e., a nearby disk lens) will also tend to produce a large lens-source relative proper motion (μ rel), source
The Demographics of Wide-Separation Planets
I begin this review by first defining what is meant by exoplanet demographics, and then motivating why we would like as broad a picture of exoplanet demographics as possible. I then outline the

## References

SHOWING 1-10 OF 42 REFERENCES
Gravitational microlensing by the galactic halo
A simple model of microlensing by massive objects that might be present in the halo of the Galaxy is presented. It is shown that in any nearby galaxy one star out of a million is strongly microlensed
Theory of Pixel Lensing
• A. Gould
• Physics, Environmental Science
• 1995
Pixel lensing, gravitational microlensing of unresolved stars, is potentially much more sensitive and much more widely applicable than is generally recognized. I give explicit expressions for the
Wide-orbit exoplanets are common. Analysis of nearly 20 years of OGLE microlensing survey data
• Geology, Physics
• 2021
We use nearly 20 years of photometry obtained by the OGLE survey to measure the occurrence rate of wide-orbit (or ice giant) microlensing planets, i.e., with separations from ≈ 5 AU to ≈ 15 AU and
KMT-2017-BLG-2820 and the Nature of the Free-floating Planet Population
• Physics, Geology
• 2020
We report a new free-floating planet (FFP) candidate, KMT-2017-BLG-2820, with Einstein radius θ E ≃ 6 μas, lens-source relative proper motion μ rel ≃ 8 mas yr−1, and Einstein timescale t E = 6.5 hr.
Predictions of the Nancy Grace Roman Space Telescope Galactic Exoplanet Survey. II. Free-floating Planet Detection Rates
• Physics, Geology
The Astronomical Journal
• 2020
The Nancy Grace Roman Space Telescope (Roman) will perform a Galactic Exoplanet Survey (RGES) to discover bound exoplanets with semi-major axes greater than 1 au using gravitational microlensing.
A Free-floating or Wide-orbit Planet in the Microlensing Event OGLE-2019-BLG-0551
• Physics, Geology
• 2020
High-cadence observations of the Galactic bulge by the microlensing surveys led to the discovery of a handful of extremely short-timescale microlensing events that can be attributed to free-floating
Candidate Brown-dwarf Microlensing Events with Very Short Timescales and Small Angular Einstein Radii
• Physics, Geology
The Astronomical Journal
• 2020
Short-timescale microlensing events are likely to be produced by substellar brown dwarfs (BDs), but it is difficult to securely identify BD lenses based on only event timescales $t_{\rm E}$ because
Osculating Versus Intersecting Circles in Space-Based Microlens Parallax Degeneracies
I investigate the origin of arc degeneracies in satellite microlens parallax pi_E measurements with only late time data, e.g., t > t0 + t_E as seen from the satellite. I show that these are due to
KMT-2018-BLG-1292: A Super-Jovian Microlens Planet in the Galactic Plane
• Physics, Geology
The Astronomical Journal
• 2020
We report the discovery of KMT-2018-BLG-1292Lb, a super-Jovian $M_{\rm planet} = 4.5\pm 1.3\,M_J$ planet orbiting an F or G dwarf $M_{\rm host} = 1.5\pm 0.4\,M_\odot$, which lies physically within
KMTNET: A NETWORK OF 1.6 M WIDE-FIELD OPTICAL TELESCOPES INSTALLED AT THREE SOUTHERN OBSERVATORIES
• Physics
• 2016
The Korea Microlensing Telescope Network (KMTNet) is a wide-field photometric system installed by the Korea Astronomy and Space Science Institute (KASI). Here, we present the overall technical