OGLE-2017-BLG-1522: A giant planet around a brown dwarf located in the Galactic bulge

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dc.contributor.authorJung YK
dc.contributor.authorUdalski A
dc.contributor.authorGould A
dc.contributor.authorRyu Y-H
dc.contributor.authorYee JC
dc.contributor.authorHan C
dc.contributor.authorAlbrow MD
dc.contributor.authorLee C-U
dc.contributor.authorKim S-L
dc.contributor.authorHwang K-H
dc.contributor.authorChung S-J
dc.contributor.authorShin I-G
dc.contributor.authorZhu W
dc.contributor.authorCha S-M
dc.contributor.authorKim D-J
dc.contributor.authorLee Y
dc.contributor.authorPark B-G
dc.contributor.authorLee D-J
dc.contributor.authorKim H-W
dc.contributor.authorPogge RW
dc.contributor.authorSzymański MK
dc.contributor.authorMróz P
dc.contributor.authorPoleski R
dc.contributor.authorSkowron J
dc.contributor.authorPietrukowicz P
dc.contributor.authorSoszyński I
dc.contributor.authorKozłowski S
dc.contributor.authorUlaczyk K
dc.contributor.authorPawlak M
dc.contributor.authorRybicki K
dc.date.accessioned2018-04-23T02:36:56Z
dc.date.available2018-04-23T02:36:56Z
dc.date.issued2018en
dc.date.updated2018-04-05T23:36:17Z
dc.description.abstractWe report the discovery of a giant planet in the OGLE-2017-BLG-1522 microlensing event. The planetary perturbations were clearly identified by high-cadence survey experiments despite the relatively short event timescale of $t_{\rm E} \sim 7.5$ days. The Einstein radius is unusually small, $\theta_{\rm E} = 0.065\,$mas, implying that the lens system either has very low mass or lies much closer to the microlensed source than the Sun, or both. A Bayesian analysis yields component masses $(M_{\rm host}, M_{\rm planet})=(46_{-25}^{+79}, 0.75_{-0.40}^{+1.26})~M_{\rm J}$ and source-lens distance $D_{\rm LS} = 0.99_{-0.54}^{+0.91}~{\rm kpc}$, implying that this is a brown-dwarf/Jupiter system that probably lies in the Galactic bulge, a location that is also consistent with the relatively low lens-source relative proper motion $\mu = 3.2 \pm 0.5~{\rm mas}~{\rm yr^{-1}}$. The projected companion-host separation is $0.59_{-0.11}^{+0.12}~{\rm AU}$, indicating that the planet is placed beyond the snow line of the host, i.e., $a_{sl} \sim 0.12~{\rm AU}$. Planet formation scenarios combined with the small companion-host mass ratio $q \sim 0.016$ and separation suggest that the companion could be the first discovery of a giant planet that formed in a protoplanetary disk around a brown dwarf host.en
dc.identifier.urihttp://hdl.handle.net/10092/15190
dc.language.isoen
dc.subjectastro-ph.EPen
dc.subjectastro-ph.SRen
dc.subjectbinaries: generalen
dc.subjectgravitational lensing: microen
dc.subjectbrown dwarfen
dc.subjectplanetary systemsen
dc.subject.anzsrcField of Research::02 - Physical Sciences::0201 - Astronomical and Space Sciences::020108 - Planetary Science (excl. Extraterrestrial Geology)en
dc.subject.anzsrcFields of Research::51 - Physical sciences::5101 - Astronomical sciences::510109 - Stellar astronomy and planetary systemsen
dc.titleOGLE-2017-BLG-1522: A giant planet around a brown dwarf located in the Galactic bulgeen
dc.typeJournal Articleen
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