2018ApJ...860...25W

Query : 2018ApJ...860...25W

2018ApJ...860...25W - Astrophys. J., 860, 25-25 (2018/June-2)

OGLE-2017-BLG-1130: the first binary gravitational microlens detected from Spitzer only.

WANG T., CALCHI NOVATI S., UDALSKI A., GOULD A., MAO S., ZANG W., BEICHMAN C., BRYDEN G., CAREY S., GAUDI B.S., HENDERSON C.B., SHVARTZVALD Y., YEE J.C. (The Spitzer Team), MROZ P., POLESKI R., SKOWRON J., SZYMANSKI M.K., SOSZYNSKI I., KOZLOWSKI S., PIETRUKOWICZ P., ULACZYK K., PAWLAK M. (The OGLE Collaboration), ALBROW M.D., CHUNG S.-J., HAN C., HWANG K.-H., JUNG Y.K., 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 R.W. (The KMTNet Collaboration)

Abstract (from CDS):

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 detected only 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.

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

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

Simbad objects: 3

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Number of rows : 3
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-2017-BLG-1130 * 18 01 36.93 -27 39 56.9           ~ 3 0
2 MOA 2014-BLG-307 BD? 18 02 29.2002 -28 23 46.549           ~ 28 0
3 OGLE-2005-BLG-169 * 18 06 05.32 -30 43 57.5     20.4     ~ 68 1

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