OGLE-2017-BLG-1130: The First Binary Gravitational Microlens Detected From Spitzer Only (2018)
We analyze the binary gravitational microlensing event OGLE-2017-BLG-1130 (mass ratio q~0.45), the first published case in which the binary anomaly was only detected by the Spitzer Space Telescope. This event provides strong evidence that some binary signals can be missed by observations from the ground alone but detected by Spitzer. We therefore invert the normal procedure, first finding the lens parameters by fitting the space-based data and then measuring the microlensing parallax using ground-based observations. We also show that the normal four-fold space-based degeneracy in the single-lens case can become a weak eight-fold degeneracy in binary-lens events. Although this degeneracy is resolved in event OGLE-2017-BLG-1130, it might persist in other events.
ANZSRC Fields of Research02 - Physical Sciences::0201 - Astronomical and Space Sciences::020102 - Astronomical and Space Instrumentation
02 - Physical Sciences::0201 - Astronomical and Space Sciences
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Ryu Y-H; Yee JC; Udalski A; Bond IA; Shvartzvald Y; Zang W; Jaimes RF; Jorgensen UG; Zhu W; Huang CX; Jung YK; Albrow MD; Chung S-J; Gould A; Han C; Hwang K-H; Shin I-G; Cha S-M; Kim D-J; Kim H-W; Kim S-L; Lee C-U; Lee D-J; Lee Y; Park B-G; Pogge RW; Novati SC; Carey S; Henderson CB; Beichman C; Gaudi BS; Mróz P; Poleski R; Skowron J; Szymanski MK; Soszynski I; Kozlowski S; Pietrukowicz P; Ulaczyk K; Pawlak M; Abe F; Asakura Y; Barry R; Bennett DP; Bhattacharya A; Donachie M; Evans P; Fukui A; Hirao Y; Itow Y; Kawasaki K; Koshimoto N; Li MCA; Ling CH; Masuda K; Matsubara Y; Miyazaki S; 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; Bryden G; Howell SB; Jacklin S; Penny MT; Mao S; Fouque P; Wang T; Street RA; Tsapras Y; Hundertmark M; Bachelet E; Dominik M; Li Z; Cross S; Cassan A; Horne K; Schmidt R; Wambsganss J; Ment SK; Maoz D; Snodgrass C; Steele IA; Bozza V; Burgdorf MJ; Ciceri S; D'Ago G; Evans DF; Hinse TC; Kerins E; Kokotanekova R; Longa P; MacKenzie J; Popovas A; Rabus M; Rahvar S; Sejadian S; Skottfelt J; Southworth J; Essen CV (2017)We report the discovery of OGLE-2016-BLG-1190Lb, which is likely to be the first Spitzer microlensing planet in the Galactic bulge/bar, an assignation that can be confirmed by two epochs of high-resolution imaging of the ...
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Spitzer Microlensing Parallax for OGLE-2017-BLG-0896 Reveals a Counter-Rotating Low-Mass Brown Dwarf Shvartzvald Y; Yee JC; Skowron J; Lee C-U; Udalski A; Novati SC; Bozza V; Beichman CA; Bryden G; Carey S; Gaudi BS; Henderson CB; Zhu W; Bachelet E; Bolt G; Christie G; Maoz D; Natusch T; Pogge RW; Street RA; Tan T-G; Tsapras Y; Pietrukowicz P; Soszyński I; Szymański MK; Mróz P; Poleski R; Kozłowski S; Ulaczyk K; Pawlak M; Rybicki KA; Iwanek P; Albrow MD; Cha S-M; Chung S-J; Gould A; Han C; Hwang K-H; Jung YK; Kim D-J; Kim H-W; Kim S-L; Lee D-J; Lee Y; Park B-G; Ryu Y-H; Shin I-G; Zang W; Dominik M; Helling C; Hundertmark M; Jørgensen UG; Longa-Peña P; Lowry S; Sajadian S; Burgdorf MJ; Campbell-White J; Ciceri S; Evans DF; Fujii YI; Hinse TC; Rahvar S; Rabus M; Skottfelt J; Snodgrass C; Southworth J (2018)The kinematics of isolated brown dwarfs in the Galaxy, beyond the solar neighborhood, is virtually unknown. Microlensing has the potential to probe this hidden population, as it can measure both the mass and five of the ...