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2019ApJ...871..179C - Astrophys. J., 871, 179-179 (2019/February-1)

Spitzer microlensing of MOA-2016-BLG-231L: a counter-rotating brown dwarf binary in the Galactic disk.

CHUNG S.-J., GOULD A., SKOWRON J., BOND I.A., ZHU W., ALBROW M.D., JUNG Y.K., HAN C., HWANG K.-H., RYU Y.-H., SHIN I.-G., SHVARTZVALD Y., YEE J.C., ZANG W., CHA S.-M., KIM D.-J., KIM H.-W., KIM S.-L., KIM Y.-H., LEE C.-U., LEE D.-J., LEE Y., PARK B.-G., POGGE R.W. (The KMTNet Collaboration), UDALSKI A., POLESKI R., MROZ P., PIETRUKOWICZ P., SZYMANSKI M.K., SOSZYNSKI I., KOZLOWSKI S., ULACZYK K., PAWLAK M. (The OGLE Collaboration), BEICHMAN C.A., BRYDEN G., CALCHI NOVATI S., CAREY S., GAUDI B.S., HENDERSON C.B. (The Spitzer Team), ABE F., BARRY R., BENNETT D.P., BHATTACHARYA A., DONACHIE M., FUKUI A., HIRAO Y., ITOW Y., KAWASAKI K., KONDO I., KOSHIMOTO N., LI M.C.A., MATSUBARA Y., MURAKI Y., MIYAZAKI S., NAGAKANE M., RANC C., RATTENBURY N.J., SUEMATSU H., SULLIVAN D.J., SUMI T., SUZUKI D., TRISTRAM P.J., YONEHARA A. (The MOA Collaboration)

Abstract (from CDS):

We analyze the binary microlensing event MOA-2016-BLG-231, which was observed from the ground and from Spitzer. The lens is composed of very-low-mass brown dwarfs (BDs) with M1=21–5+12 MJ and M2=9–2+5 MJ, and it is located in the Galactic disk DL=2.85–0.50+0.88 kpc. This is the fifth binary brown dwarf discovered by microlensing, and the BD binary is moving counter to the orbital motion of disk stars. Constraints on the lens physical properties come from late-time, non-caustic-crossing features of the Spitzer light curve. Thus, MOA-2016-BLG-231 shows how Spitzer plays a crucial role in resolving the nature of BDs in binary BD events with short timescales (<=10 days).

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

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

Simbad objects: 21

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