OGLE-2016-BLG-1266: A Probable Brown-Dwarf/Planet Binary at the Deuterium Fusion Limit (2018)
AuthorsAlbrow MD, Yee JC, Udalski A, Novati SC, Carey S, Henderson CB, Beichman C, Bryden G, Gaudi BS, Shvartzvald Y, Szymanśki MK, Mroź P, Skowron J, Poleski R, Soszynśki I, Kozlowski S, Pietrukowicz, Ulaczyk K, Pawlak M, Chung S-J, Gould A, Han C, Hwang K-H, Jung YK, Ryu Y-H, Shin I-G, Zhu W, Cha S-M, Kim D-J, Kim H-W, Kim S-L, Lee C-U, Lee D-J, Lee Y, Park B-G, Pogge RWshow all
We report the discovery, via the microlensing method, of a new very-low-mass binary system. By combining measurements from Earth and from the Spitzer telescope in Earth-trailing orbit, we are able to measure the microlensing parallax of the event, and find that the lens likely consists of an (12.0 \pm 0.6) M3 + (15.7 \pm 1.5) M3 super-Jupiter / brown-dwarf pair. The binary is located at a distance of (3.08 \pm 0.18) kpc in the Galactic Plane, and the components have a projected separation of (0.43 \pm 0.03) AU. Two alternative solutions with much lower likelihoods are also discussed, an 8- and 6-M3 model and a 90- and 70-M3 model. Although disfavored at the 3-o and 5-o levels, these alternatives cannot be rejected entirely. We show how the more-massive of these models could be tested with future direct imaging.
ANZSRC Fields of Research02 - Physical Sciences::0201 - Astronomical and Space Sciences::020110 - Stellar Astronomy and Planetary Systems
02 - Physical Sciences::0201 - Astronomical and Space Sciences