2018AJ....155..261C

Query : 2018AJ....155..261C

2018AJ....155..261C - Astron. J., 155, 261-261 (2018/June-0)

Spitzer opens new path to break classic degeneracy for Jupiter-mass microlensing planet OGLE-2017-BLG-1140Lb.

CALCHI NOVATI S., SKOWRON J., JUNG Y.K., BEICHMAN C., BRYDEN G., CAREY S., GAUDI B.S., HENDERSON C.B., SHVARTZVALD Y., YEE J.C., ZHU W. (The Spitzer Team), UDALSKI A., SZYMANSKI M.K., MROZ P., POLESKI R., SOSZYNSKI I., KOZLOWSKI S., PIETRUKOWICZ P., ULACZYK K., PAWLAK M., RYBICKI K., IWANEK P. (The OGLE Collaboration), ALBROW M.D., CHUNG S.-J., GOULD A., HAN C., HWANG K.-H., RYU Y.-H., SHIN I.-G., ZANG 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 combined Spitzer and ground-based data for OGLE-2017-BLG-1140 and show that the event was generated by a Jupiter-class (mp≃1.6MJup) planet orbiting a mid-late M dwarf (M≃0.2M☉) that lies DLS≃1.0kpc in the foreground of the microlensed Galactic-bar source star. The planet-host projected separation is a⊥≃1.0au, i.e., well beyond the snow line. By measuring the source proper motion µs from ongoing long-term OGLE imaging and combining this with the lens-source relative proper motion µrel derived from the microlensing solution, we show that the lens proper motion µl=µrel+µs is consistent with the lens lying in the Galactic disk, although a bulge lens is not ruled out. We show that while the Spitzer and ground-based data are comparably well fitted by planetary (i.e., binary-lens (2L1S)) and binary-source (1L2S) models, the combination of Spitzer and ground-based data decisively favors the planetary model. This is a new channel to resolve the 2L1S/1L2S degeneracy, which can be difficult to break in some cases.

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

Journal keyword(s): gravitational lensing: micro

Simbad objects: 15

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Number of rows : 15
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-2015-BLG-1285 * 17 39 23.25 -27 49 13.0           ~ 5 0
3 OGLE-2017-BLG-1140 * 17 47 31.9261006416 -24 31 21.673742772           ~ 10 0
4 NAME EWS 2017-BLG-1140b Pl 17 47 31.9261006416 -24 31 21.673742772           ~ 6 0
5 OGLE-2015-BLG-1482 * 17 50 31.330 -30 53 19.30           ~ 10 0
6 NAME EWS 2005-BLG-390b Pl 17 54 19.2 -30 22 38           ~ 80 1
7 MOA 2015-BLG-281 BD? 17 55 01.020 -29 02 49.60           ~ 22 0
8 MOA 2016-BLG-350b Pl 17 55 23.50 -30 12 26.1           ~ 20 0
9 MOA 2016-BLG-350 BD? 17 55 23.50 -30 12 26.1           ~ 41 0
10 OGLE-2015-BLG-1459 * 17 56 09.90 -29 49 26.3           ~ 12 0
11 MOA 2016-BLG-383 * 17 58 52.30 -27 36 48.8           ~ 14 0
12 OGLE-2017-BLG-1130 * 18 01 36.93 -27 39 56.9           ~ 3 0
13 MOA 2014-BLG-307 BD? 18 02 29.2002 -28 23 46.549           ~ 28 0
14 MOA 2016-BLG-339 * 18 12 49.0702747824 -27 00 45.565682832           ~ 12 0
15 NAME Galactic Bar reg ~ ~           ~ 1458 0

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