2017ApJ...845..129W

Query : 2017ApJ...845..129W

2017ApJ...845..129W - Astrophys. J., 845, 129-129 (2017/August-3)

Ground-based parallax confirmed by Spitzer: binary microlensing event MOA-2015-BLG-020.

WANG T., ZHU W., MAO S., BOND I.A., GOULD A., UDALSKI A., SUMI T., BOZZA V., RANC C., CASSAN A., YEE J.C., HAN C., ABE F., ASAKURA Y., BARRY R., BENNETT D.P., BHATTACHARYA A., DONACHIE M., EVANS P., FUKUI A., HIRAO Y., ITOW Y., KAWASAKI K., KOSHIMOTO N., LI M.C.A., LING C.H., MASUDA K., MATSUBARA Y., MIYAZAKI S., MURAKI Y., NAGAKANE M., OHNISHI K., RATTENBURY N., SAITO T., SHARAN A., SHIBAI H., SULLIVAN D.J., SUZUKI D., TRISTRAM P.J., YAMADA T., YONEHARA A. (The MOA Collaboration), KOZLOWSKI S., MROZ P., PAWLAK M., PIETRUKOWICZ P., POLESKI R., SKOWRON J., SOSZYNSKI I., SZYMANSKI M.K., ULACZYK K. (The OGLE Collaboration), BEICHMAN C., BRYDEN G., CALCHI NOVATI S., CAREY S., FAUSNAUGH M., GAUDI B.S., HENDERSON C.B., SHVARTZVALD Y., WIBKING B. (The Spitzer Team), ALBROW M.D., CHUNG S.-J., HWANG K.-H., JUNG Y.K., RYU Y.-H., SHIN I.-G., CHA S.-M., KIM D.-J., KIM H.-W., KIM S.-L., LEE C.-U., LEE Y., PARK B.-G., POGGE R.W. (The KMTNet Collaboration), STREET R.A., TSAPRAS Y., HUNDERTMARK M., BACHELET E., DOMINIK M., HORNE K., FIGUERA JAIMES R., WAMBSGANSS J., BRAMICH D.M., SCHMIDT R., SNODGRASS C., STEELE I.A., MENZIES J. (The RoboNet Collaboration)

Abstract (from CDS):

We present the analysis of the binary gravitational microlensing event MOA-2015-BLG-020. The event has a fairly long timescale (∼63 days) and thus the light curve deviates significantly from the lensing model that is based on the rectilinear lens-source relative motion. This enables us to measure the microlensing parallax through the annual parallax effect. The microlensing parallax parameters constrained by the ground-based data are confirmed by the Spitzer observations through the satellite parallax method. By additionally measuring the angular Einstein radius from the analysis of the resolved caustic crossing, the physical parameters of the lens are determined. It is found that the binary lens is composed of two dwarf stars with masses M1=0.606±0.028 M☉ and M2=0.125 ±0.006 M☉ in the Galactic disk. Assuming that the source star is at the same distance as the bulge red clump stars, we find the lens is at a distance DL=2.44±0.10 kpc. We also provide a summary and short discussion of all of the published microlensing events in which the annual parallax effect is confirmed by other independent observations.

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

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

Simbad objects: 12

goto Full paper

goto View the references in ADS

Number of rows : 12
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 BLG613.9 20182 * 17 32 23.41 -29 18 09.7           ~ 11 0
2 OGLE-2011-BLG-0417 * 17 34 33.11 -27 06 39.3           ~ 17 0
3 OGLE-2015-BLG-0479 * 17 43 40.55 -35 30 33.4           ~ 5 0
4 OGLE-2015-BLG-0196 * 17 45 58.30 -32 57 24.4           ~ 4 0
5 OGLE-2005-BLG-071 * 17 50 09.77 -34 40 23.5           ~ 62 1
6 OGLE-2016-BLG-0168 * 17 50 49.89 -31 45 30.1           ~ 6 0
7 OGLE-2006-BLG-109 * 17 52 34.55 -30 05 15.7     19.035   16.643 ~ 94 2
8 OGLE-2015-BLG-0102 * 17 52 52.78 -32 29 09.1           ~ 1 0
9 MOA 2015-BLG-20 * 17 52 52.780 -32 29 08.91           ~ 4 0
10 MOA 2014-BLG-307 BD? 18 02 29.2002 -28 23 46.549           ~ 28 0
11 OGLE-2009-BLG-020 * 18 04 20.960 -29 31 08.96           ~ 12 0
12 MOA 2007-BLG-379 ** 18 05 24.43 -26 25 18.8           ~ 58 1

To bookmark this query, right click on this link: simbad:objects in 2017ApJ...845..129W and select 'bookmark this link' or equivalent in the popup menu