A Neptune-mass Free-floating Planet Candidate Discovered by Microlensing Surveys

Mróz, P.; Ryu, Yoon-Hyun; Skowron, J.; Udalski, A.; Gould, Andrew; Szymański, M. K.; Soszyński, I.; Poleski, R.; Pietrukowicz, P.; Kozłowski, S.; Pawlak, M.; Ulaczyk, K.; Albrow, M. D.; Chung, Sun-Ju; Jung, Youn Kil; Han, Cheongho; Hwang, Kyu-Ha; Shin, In-Gu; Yee, Jennifer C.; Zhu, Wei; Cha, Sang-Mok; Kim, Dong-Jin; Kim, H.-W.; Kim, S.-L.; Lee, C.-U.; Lee, D.-J.; Lee, Y.; Park, B.-G.; Pogge, Richard W.

doi:10.3847/1538-3881/aaaae9

Cited by 107 publications

(111 citation statements)

References 51 publications

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“…From detailed investigation, it is found that the event is produced by a wide-separation planet and the analyses will be presented in a separate paper. Mróz et al (2018Mróz et al ( , 2019, respectively. They pointed out that the lens of OGLE-2016-BLG-1540 was likely to be a Neptunemass free-floating planet in the Galactic disk and the lens of OGLE-2017-BLG-0560 is either a Jupiter-mass free-floating planet in the disk or a BD in the bulge.…”

Section: Event Selectionmentioning

confidence: 99%

Candidate Brown-dwarf Microlensing Events with Very Short Timescales and Small Angular Einstein Radii

Han

Lee

Udalski

et al. 2020

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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 E because short-timescale events can also be produced by stellar lenses with high relative lens-source proper motions. In this paper, we report three strong candidate BD-lens events found from the search for lensing events not only with short timescales (  t 6 days E ) but also with very small angular Einstein radii (q  0.05 mas E ) among the events that have been found in the

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Section: Event Selectionmentioning

confidence: 99%

Candidate Brown-dwarf Microlensing Events with Very Short Timescales and Small Angular Einstein Radii

Han

Lee

Udalski

et al. 2020

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“…Uniquely, microlensing requires no light from the lens, enabling it to detect objects otherwise too dark to measure, including free-floating planets [FFPs]. The effectiveness of this technique has now been demonstrated by the discovery of three candidate FFP events [5,6] (Fig 1). A survey of the Galactic Bulge region where the rate of microlensing events is highest is one of the main goals of NASA's WFIRST Mission [7].…”

Section: Scientific Motivationmentioning

confidence: 99%

Unique Science from a Coordinated LSST-WFIRST Survey of the Galactic Bulge

Street¹,

Golovich

Dawson

2018

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NASA's WFIRST mission will perform a wide-field, NIR survey of the Galactic Bulge to search for exoplanets via the microlensing techniques. As the mission is due to launch in the mid-2020s, around half-way through the LSST Main Survey, we have a unique opportunity to explore synergistic science from two landmark programs. LSST can survey the entire footprint of the WFIRST microlensing survey in a single Deep Drilling Field. Here we explore the great scientific potential of this proposal and recommend the most effective observing strategies.

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“…The deformation can occur when the angular source radius θ * is comparable to θ E for FFP event, in which case the light curve is very likely to be affected by severe finite-source effects. Recently, three candidates of FFPs were reported by Mróz et al (2018) and Mróz et al (2019) from the analyses of the lensing events with these characteristics.…”

Section: Introductionmentioning

confidence: 99%

OGLE-2016-BLG-1227L: A Wide-separation Planet from a Very Short-timescale Microlensing Event

Han

Udalski²,

Gould³

et al. 2020

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We present the analysis of the microlensing event OGLE-2016-BLG-1227. The light curve of this shortduration event appears to be a single-lens event affected by severe finite-source effects. Analysis of the light curve based on single-lens single-source (1L1S) modeling yields very small values of the event timescale, t E ∼ 3.5 days, and the angular Einstein radius, θ E ∼ 0.009 mas, making the lens a candidate of a free-floating planet. Close inspection reveals that the 1L1S solution leaves small residuals with amplitude ∆I 0.03 mag. We find that the residuals are explained by the existence of an additional widely-separated heavier lens component, indicating that the lens is a wide-separation planetary system rather than a free-floating planet. From Bayesian analysis, it is estimated that the planet has a mass of M p = 0.79 +1.30 −0.39 M J and it is orbiting a low-mass host star with a mass of M host = 0.10 +0.17 −0.05 M ⊙ located with a projected separation of a ⊥ = 3.4 +2.1 −1.0 au. The planetary system is located in the Galactic bulge with a line-of-sight separation from the source star of D LS = 1.21 +0.96 −0.63 kpc. The event shows that there are a range of deviations in the signatures of host stars for apparently isolated planetary lensing events and that it is possible to identify a host even when a deviation is subtle.

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A Neptune-mass Free-floating Planet Candidate Discovered by Microlensing Surveys

Cited by 107 publications

References 51 publications

Candidate Brown-dwarf Microlensing Events with Very Short Timescales and Small Angular Einstein Radii

Candidate Brown-dwarf Microlensing Events with Very Short Timescales and Small Angular Einstein Radii

Unique Science from a Coordinated LSST-WFIRST Survey of the Galactic Bulge

OGLE-2016-BLG-1227L: A Wide-separation Planet from a Very Short-timescale Microlensing Event

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