A free-floating planet candidate from the OGLE and KMTNet surveys

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dc.contributor.authorMroz P
dc.contributor.authorRyu Y-H
dc.contributor.authorSkowron J
dc.contributor.authorUdalski A
dc.contributor.authorGould A
dc.contributor.authorSzymanski MK
dc.contributor.authorSoszynski I
dc.contributor.authorPoleski R
dc.contributor.authorPietrukowicz P
dc.contributor.authorKozlowski S
dc.contributor.authorPawlak M
dc.contributor.authorUlaczyk K
dc.contributor.authorAlbrow MD
dc.contributor.authorChung S-J
dc.contributor.authorJung YK
dc.contributor.authorHan C
dc.contributor.authorHwang K-H
dc.contributor.authorShin I-G
dc.contributor.authorYee JC
dc.contributor.authorZhu W
dc.contributor.authorCha S-M
dc.contributor.authorKim D-J
dc.contributor.authorKim H-W
dc.contributor.authorKim S-L
dc.contributor.authorLee C-U
dc.contributor.authorLee D-J
dc.contributor.authorLee Y
dc.contributor.authorPark B-G
dc.contributor.authorPogge RW
dc.date.accessioned2018-04-23T05:10:52Z
dc.date.available2018-04-23T05:10:52Z
dc.date.issued2017en
dc.date.updated2018-01-17T14:19:29Z
dc.description.abstractCurrent 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 2 d), 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 ($t_{\rm E}=0.320\pm0.003$ d) microlensing event OGLE-2016-BLG-1540. The event exhibited strong finite source effects, which allowed us to measure its angular Einstein radius of $\theta_{\rm E}=9.2\pm0.5$ uas. 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. Owing to the relatively large relative lens-source proper motion, any stellar companions should be detectable using the high-resolution imaging in the relatively near future.en
dc.identifier.urihttp://hdl.handle.net/10092/15193
dc.language.isoen
dc.subjectastro-ph.EPen
dc.subjectplanets and satellites: detectionen
dc.subjectgravitational lensing: microen
dc.subject.anzsrcFields of Research::51 - Physical sciences::5101 - Astronomical sciences::510109 - Stellar astronomy and planetary systemsen
dc.subject.anzsrcField of Research::02 - Physical Sciences::0201 - Astronomical and Space Sciences::020108 - Planetary Science (excl. Extraterrestrial Geology)en
dc.titleA free-floating planet candidate from the OGLE and KMTNet surveysen
dc.typeJournal Articleen
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