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2017ApJ...843...59H - Astrophys. J., 843, 59-59 (2017/July-1)

OGLE-2016-BLG-1469L: microlensing binary composed of brown dwarfs.

HAN C., UDALSKI A., SUMI T., GOULD 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. (The KMTNet Collaboration), SOSZYNSKI I., MROZ P., PIETRUKOWICZ P., SZYMANSKI M.K., SKOWRON J., POLESKI R., KOZLOWSKI S., ULACZYK K., PAWLAK M. (The OGLE Collaboration), ABE F., ASAKURA Y., BENNETT D.P., BOND I.A., BHATTACHARYA A., DONACHIE M., FREEMAN M., 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., OYOKAWA H., RATTENBURY N.J., SAITO T., SHARAN A., SULLIVAN D.J., SUZUKI D., TRISTRAM P.J., YAMADA T., YAMADA T., YONEHARA A., BARRY R. (The MOA Collaboration)

Abstract (from CDS):

We report the discovery of a binary composed of two brown dwarfs, based on the analysis of the microlensing event OGLE-2016-BLG-1469. Thanks to the detection of both finite-source and microlens-parallax effects, we are able to measure both the masses M1∼0.05 M☉ and M2∼0.01 M☉, and the distance DL∼4.5 kpc, as well as the projected separation a⊥∼0.33 au. This is the third brown-dwarf binary detected using the microlensing method, demonstrating the usefulness of microlensing in detecting field brown-dwarf binaries with separations of less than 1 au.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): binaries: general - brown dwarfs - gravitational lensing: micro - gravitational lensing: micro

Simbad objects: 5

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