2019AJ....158..199S

Query : 2019AJ....158..199S

2019AJ....158..199S - Astron. J., 158, 199-199 (2019/November-0)

The 2L1S/1L2S degeneracy for two microlensing planet candidates discovered by the KMTNet survey in 2017.

SHIN I.-G., YEE J.C., GOULD A., PENNY M.T., BOND I.A., ALBROW M.D., CHUNG S.-J., HAN C., HWANG K.-H., JUNG Y.K., RYU Y.-H., SHVARTZVALD Y., 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), ABE F., BARRY R., BENNETT D.P., BHATTACHARYA A., DONACHIE M., FUJII H., FUKUI A., HIRAO Y., ITOW Y., KAMEI Y., KONDO I., KOSHIMOTO N., LI M.C.A., MATSUBARA Y., MIYAZAKI S., MURAKI Y., NAGAKANE M., RANC C., RATTENBURY N.J., SUEMATSU H., SULLIVAN D.J., SUMI T., SUZUKI D., TRISTRAM P.J., YAMAKAWA T., YONEHARA A. (The MOA Collaboration), FOUQUE P., ZANG W. (The CFHT-K2C9 Microlensing Collaboration)

Abstract (from CDS):

We report two microlensing planet candidates discovered by the Korea Microlensing Telescope Network (KMTNet) survey in 2017. However, both events have the 2L1S/1L2S degeneracy, which is an obstacle to claiming the discovery of the planets with certainty unless the degeneracy can be resolved. For KMT-2017-BLG-0962, the degeneracy cannot be resolved. If the 2L1S solution is correct, KMT-2017-BLG-0962 might be produced by a super Jupiter-mass planet orbiting a mid-M-dwarf host star. For KMT-2017-BLG-1119, the light-curve modeling favors the 2L1S solution but higher-resolution observations of the baseline object tend to support the 1L2S interpretation rather than the planetary interpretation. This degeneracy might be resolved by a future measurement of the lens-source relative proper motion. This study shows that the problem of resolving 2L1S/1L2S degeneracy exists over a much wider range of conditions than those considered by the theoretical study of Gaudi (1998).

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

Journal keyword(s): planets and satellites: detection - gravitational lensing: micro

Simbad objects: 6

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Number of rows : 6
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 KMT-2017-BLG-0962 * 17 46 48.540 -26 10 48.07           ~ 2 0
2 KMT-2017-BLG-1119 * 17 52 10.630 -33 01 05.30           ~ 2 0
3 OGLE-2017-BLG-0019 * 17 52 18.74 -33 00 04.0           ~ 2 0
4 OGLE-2005-BLG-390 * 17 54 19.2 -30 22 38           KIII 54 1
5 NAME Baade Window reg 18 03.5 -30 01           ~ 643 3
6 NAME Galactic Bulge reg ~ ~           ~ 4794 0

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