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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 742689.0, MPI für Astronomie / Publikationen_mpia
OGLE-2016-BLG-0263Lb: Microlensing detection of a very low-mass binary companion through a repeating event channel
Authors:Han, C.; Udalski, A.; Gould, A.; Bond, I. A.; Albrow, M. D.; Chung, S. -. J.; Jung, Y. K.; Ryu, Y. -. H.; Shin, I. -. G.; Yee, J. C.; Zhu, W.; Cha, S. -. M.; Kim, S. -. L.; Kim, D. -. J.; Lee, C. -. U.; Lee, Y.; Park, B. -. G.; Skowron, J.; Mróz, P.; Pietrukowicz, P.; Kozłowski, S.; Poleski, R.; Szymański, M. K.; Soszyński, I.; Ulaczyk, K.; Pawlak, M.; Abe, F.; Asakura, Y.; Barry, R.; Bennett, D. P.; Bhattacharya, A.; Donachie, M.; Evans, P.; Fukui, A.; Hirao, Y.; Itow, Y.; Koshimoto, N.; Li, M. C. A.; Ling, C. H.; Masuda, K.; Matsubara, Y.; Muraki, Y.; Nagakane, M.; Ohnishi, K.; Ranc, C.; Rattenbury, N. J.; Saito, T.; Sharan, A.; Sullivan, D. J.; Sumi, T.; Suzuki, D.; Tristram, P. J.; Yamada, T.; Yonehara, A.
Date of Publication (YYYY-MM-DD):2017
Title of Journal:The Astronomical Journal
Issue / Number:4
Start Page:id. 133 (9 pp)
Audience:Not Specified
Abstract / Description:We report the discovery of a planet-mass companion to the microlens OGLE-2016-BLG-0263L. Unlike most low-mass companions that were detected through perturbations to the smooth and symmetric light curves produced by the primary, the companion was discovered through the channel of a repeating event, in which the companion itself produced its own single-mass light curve after the event produced by the primary had ended. Thanks to the continuous coverage of the second peak by high-cadence surveys, the possibility of the repeating nature due to source binarity is excluded with a 96% confidence level. The mass of the companion estimated by a Bayesian analysis is {M}{{p}}={4.1}-2.5+6.5 {M}{{J}}. The projected primary-companion separation is {a}\perp ={6.5}-1.9+1.3 au. The ratio of the separation to the snow-line distance of {a}\perp /{a}{sl}∼ 15.4 corresponds to the region beyond Neptune, the outermost planet of the solar system. We discuss the importance of high-cadence surveys in expanding the range of microlensing detections of low-mass companions and future space-based microlensing surveys.
Free Keywords:brown dwarfs; gravitational lensing: micro; planetary systems
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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