Shortest Microlensing Event with a Bound Planet: KMT-2016-BLG-2605

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dc.contributor.authorRyu Y-H
dc.contributor.authorHwang K-H
dc.contributor.authorGould A
dc.contributor.authorYee JC
dc.contributor.authorChung S-J
dc.contributor.authorHan C
dc.contributor.authorJung YK
dc.contributor.authorKim H-W
dc.contributor.authorShin I-G
dc.contributor.authorShvartzvald Y
dc.contributor.authorZang W
dc.contributor.authorCha S-M
dc.contributor.authorKim D-J
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.contributor.authorAlbrow, Michael
dc.date.accessioned2021-11-02T20:48:26Z
dc.date.available2021-11-02T20:48:26Z
dc.date.issued2021en
dc.date.updated2021-06-17T03:03:14Z
dc.description.abstractKMT-2016-BLG-2605, with planet-host mass ratio $q=0.012\pm 0.001$, has the shortest Einstein timescale, $t_\e = 3.41\pm 0.13\,$days, of any planetary microlensing event to date. This prompts us to examine the full sample of 7 short ($t_\e<7\,$day) planetary events with good $q$ measurements. We find that six have clustered Einstein radii $\theta_\e = 115\pm 20\,\muas$ and lens-source relative proper motions $\mu_\rel\simeq 9.5\pm 2.5\,\masyr$. For the seventh, these two quantities could not be measured. These distributions are consistent with a Galactic-bulge population of very low-mass (VLM) hosts near the hydrogen-burning limit. This conjecture could be verified by imaging at first adaptive-optics light on next-generation (30m) telescopes. Based on a preliminary assessment of the sample, "planetary" companions (i.e., below the deuterium-burning limit) are divided into "genuine planets", formed in their disks by core accretion, and very low-mass brown dwarfs, which form like stars. We discuss techniques for expanding the sample, which include taking account of the peculiar "anomaly dominated" morphology of the KMT-2016-BLG-2605 light curve.en
dc.identifier.citationRyu Y-H, Hwang K-H, Gould A, Yee JC, Albrow MD, Chung S-J, Han C, Jung YK, Kim H-W, Shin I-G, Shvartzvald Y, Zang W, Cha S-M, Kim D-J, Kim S-L, Lee C-U, Lee D-J, Lee Y, Park B-G, Pogge RW Shortest Microlensing Event with a Bound Planet: KMT-2016-BLG-2605.en
dc.identifier.urihttps://hdl.handle.net/10092/102830
dc.language.isoen
dc.rightsAll rights reserved unless otherwise stateden
dc.rights.urihttp://hdl.handle.net/10092/17651en
dc.subjectastro-ph.EPen
dc.subjectastro-ph.GAen
dc.subjectgravitational lensing: microen
dc.subject.anzsrcFields of Research::51 - Physical sciences::5101 - Astronomical sciences::510107 - Planetary science (excl. solar system and planetary geology)en
dc.subject.anzsrcFields of Research::51 - Physical sciences::5101 - Astronomical sciences::510109 - Stellar astronomy and planetary systemsen
dc.titleShortest Microlensing Event with a Bound Planet: KMT-2016-BLG-2605en
dc.typeJournal Articleen
uc.collegeFaculty of Science
uc.departmentSchool of Physical & Chemical Sciences
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