2019ApJ...870...11B

Query : 2019ApJ...870...11B

2019ApJ...870...11B - Astrophys. J., 870, 11-11 (2019/January-1)

First assessment of the binary lens OGLE-2015-BLG-0232.

BACHELET E., BOZZA V., HAN C., UDALSKI A., BOND I.A., BEAULIEU J.-P., STREET R.A., KIM H.-I., BRAMICH D.M., CASSAN A., DOMINIK M., FIGUERA JAIMES R., HORNE K., HUNDERTMARK M., MAO S., MENZIES J., RANC C., SCHMIDT R., SNODGRASS C., STEELE I.A., TSAPRAS Y., WAMBSGANSS J. (The RoboNet Collaboration), MROZ P., SOSZYNSKI I., SZYMANSKI M.K., SKOWRON J., PIETRUKOWICZ P., KOZLOWSKI S., POLESKI R., ULACZYK K., PAWLAK M. (The OGLE Collaboration), 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., RATTENBURY N.J., SUEMATSU H., SULLIVAN D.J., SUMI T., SUZUKI D., TRISTRAM P.J., YONEHARA A. (The MOA Collaboration)

Abstract (from CDS):

We present an analysis of the microlensing event OGLE-2015-BLG-0232. This event is challenging to characterize for two reasons. First, the light curve is not well sampled during the caustic crossing due to the proximity of the full Moon impacting the photometry quality. Moreover, the source brightness is difficult to estimate because this event is blended with a nearby K dwarf star. We found that the light-curve deviations are likely due to a close brown dwarf companion (i.e., s = 0.55 and q = 0.06), but the exact nature of the lens is still unknown. We finally discuss the potential of follow-up observations to estimate the lens mass and distance in the future.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

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

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 OGLE-2015-BLG-0232 * 18 06 43.84 -32 54 27.3           ~ 2 0
2 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 1164 0
3 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2
4 NAME Galactic Bulge reg ~ ~           ~ 4794 0

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