arXiv:1803.05095 [astro-ph.EP]AbstractReferencesReviewsResources
OGLE-2017-BLG-1522: A giant planet around a brown dwarf located in the Galactic bulge
Y. K. Jung, A. Udalski, A. Gould, Y. -H. Ryu, J. C. Yee, C. Han, M. D. Albrow, C. -U. Lee, S. -L. Kim, K. -H. Hwang, S. -J. Chung, I. -G. Shin, W. Zhu, S. -M. Cha, D. -J. Kim, Y. Lee, B. -G. Park, D. -J. Lee, H. -W. Kim, R. W. Pogge, M. K. Szymański, P. Mróz, R. Poleski, J. Skowron, P. Pietrukowicz, I. Soszyński, S. Kozłowski, K. Ulaczyk, M. Pawlak, K. Rybicki
Published 2018-03-14Version 1
We 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.