OGLE-2016-BLG-0263Lb: Microlensing Detection of a Very Low-mass Binary Companion through a Repeating Event Channel (2017)
© 2017. The American Astronomical Society. All rights reserved. We report the discovery of a planet-mass companion to the microlens OGLE-2016-BLG-0263L. Unlike most lowmass 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 α ⊥ = 6.5 1.9 1.3 au. The ratio of the separation to the snow-line distance of α ⊥ 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.
CitationHan C, Udalski A, Gould A, Bond IA, Albrow MD, Chung SJ, Jung YK, Ryu YH, Shin IG, Yee JC, Zhu W, Cha SM, Kim SL, Kim DJ, Lee CU, Lee Y, Park BG, Skowron J, Mróz P, Pietrukowicz P, Kozłowski S, Poleski R, Szymański MK, Soszyński I, Ulaczyk K, Pawlak M, Abe F, Asakura Y, Barry R, Bennett DP, Bhattacharya A, Donachie M, Evans P, Fukui A, Hirao Y, Itow Y, Koshimoto N, Li MCA, Ling CH, Masuda K, Matsubara Y, Muraki Y, Nagakane M, Ohnishi K, Ranc C, Rattenbury NJ, Saito T, Sharan A, Sullivan DJ, Sumi T, Suzuki D, Tristram PJ, Yamada T, Yamada T, Yonehara A (2017). OGLE-2016-BLG-0263Lb: Microlensing Detection of a Very Low-mass Binary Companion through a Repeating Event Channel. Astronomical Journal. 154(4). 133-133.
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Keywordsbrown dwarfs; gravitational lensing: micro; planetary systems
ANZSRC Fields of Research51 - Physical sciences::5101 - Astronomical sciences::510109 - Stellar astronomy and planetary systems
51 - Physical sciences::5101 - Astronomical sciences::510105 - General relativity and gravitational waves
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