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

Mróz, P., Ryu, Y.-.-H., Skowron, J., Udalski, A., Gould, A., Szymański, M. K., et al. (2018). A Neptune-mass Free-floating Planet Candidate Discovered by Microlensing Surveys. The Astronomical Journal, 155.

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Mróz, Przemek1, Author
Ryu, Y. -H.1, Author
Skowron, J.1, Author
Udalski, A.1, Author
Gould, A.1, Author
Szymański, M. K.1, Author
Soszyński, I.1, Author
Poleski, R.1, Author
Pietrukowicz, P.1, Author
Kozłowski, S.1, Author
Pawlak, M.1, Author
Ulaczyk, K.1, Author
Collaboration, OGLE1, Author
Albrow, M. D.1, Author
Chung, S. -J.1, Author
Jung, Y. K.1, Author
Han, C.1, Author
Hwang, K. -H.1, Author
Shin, I. -G.1, Author
Yee, J. C.1, Author
Zhu, W.1, AuthorCha, S. -M.1, AuthorKim, D. -J.1, AuthorKim, H. -W.1, AuthorKim, S. -L.1, AuthorLee, C. -U.1, AuthorLee, D. -J.1, AuthorLee, Y.1, AuthorPark, B. -G.1, AuthorPogge, R. W.1, AuthorCollaboration, KMTNet1, Author more..
Affiliations:
1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

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Free keywords: gravitational lensing: micro planets and satellites: detection Astrophysics - Earth and Planetary Astrophysics
 Abstract: Current microlensing surveys are sensitive to free-floating planets down to Earth-mass objects. All published microlensing events attributed to unbound planets were identified based on their short timescale (below two days), but lacked an angular Einstein radius measurement (and hence lacked a significant constraint on the lens mass). Here, we present the discovery of a Neptune-mass free-floating planet candidate in the ultrashort (t E = 0.320 ± 0.003 days) microlensing event OGLE-2016-BLG-1540. The event exhibited strong finite-source effects, which allowed us to measure its angular Einstein radius of θ E = 9.2 ± 0.5 μas. There remains, however, a degeneracy between the lens mass and distance. The combination of the source proper motion and source-lens relative proper motion measurements favors a Neptune-mass lens located in the Galactic disk. However, we cannot rule out that the lens is a Saturn-mass object belonging to the bulge population. We exclude stellar companions up to ̃15 au.

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 Dates: 2018
 Publication Status: Issued
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Title: The Astronomical Journal
Source Genre: Journal
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Pages: - Volume / Issue: 155 Sequence Number: - Start / End Page: - Identifier: -