2026AJ....171...41L

Query : 2026AJ....171...41L

2026AJ....171...41L - Astron. J., 171, 41 (2026/January-0)

KMT-2022-BLG-1818Lb,c: A Cold Super-Jupiter with a Saturn Sibling.

LI H., ZHANG J., HAN C., ZANG W., JUNG Y.K., UDALSKI A., SUMI T., YANG H., KUANG R., MAO S. (The Leading Authors), ALBROW M.D., CHUNG S.-J., GOULD A., HWANG K.-H., RYU Y.-H., SHIN I.-G., SHVARTZVALD Y., YEE J.C., CHA S.-M., KIM D.-J., KIM S.-L., LEE C.-U., LEE D.-J., LEE Y., PARK B.-G., POGGE R.W. (The KMTNet Collaboration), MONARD B., TANG Y., DONG S., LIU Z., CHRISTIE G., McCORMICK J., NATUSCH T., QIAN Q., MAOZ D., ZHU W. (The MAP and uFUN Follow-up Team), MROZ P., SZYMANSKI M.K., SKOWRON J., POLESKI R., SOSZYNSKI I., PIETRUKOWICZ P., KOZLOWSKI S., RYBICKI K.A., IWANEK P., ULACZYK K., WRONA M., GROMADZKI M., MROZ M.J. (The OGLE Collaboration), ABE F., BANDO K., BENNETT D.P., BHATTACHARYA A., BOND I.A., FUKUI A., HAMADA R., HAMADA S., HAMASAK N., HIRAO Y., ISHITANI SILVA S., KOSHIMOTO N., MATSUBARA Y., MIYAZAKI S., MURAKI Y., NAGAI T., NUNOTA K., OLMSCHENK G., RANC C., RATTENBURY N.J., SATOH Y., SUZUKI D., TERRY S., TRISTRAM P.J., VANDOROU A., YAMA H. (The MOA Collaboration)

Abstract (from CDS):

We present the discovery and analysis of the sixth microlensing two-planet system, KMT-2022-BLG-1818Lb,c, detected by a follow-up program targeting high-magnification events. The second planet was identified from implausible physical parameters for the models with a single planet. Both planets are subject to the well-known “close/wide” degeneracy, although for the first planet, which has a super-Jovian mass ratio of q2 ≃ 5 × 10–3 in both solutions, the close topology, with a normalized separation of s ≃ 0.70, is clearly preferred by Δχ2 = 26. However, contrary to all previous two-planet microlensing systems, the mass ratio for the second planet, q3, is substantially (factor of ∼10) different for the Close and Wide topologies of the first planet. While this degeneracy is resolved in the present case due to high-cadence follow-up observations, the appearance of this new degeneracy indicates the need for caution in the analysis of future two-planet systems. A Bayesian analysis suggests that the host is likely a K dwarf star in the Galactic disk. The first planet is probably a super-Jupiter on a Jupiter-like orbit, while the second planet is a Saturn-class planet on either a Mercury-like or Saturn-like orbit.

Abstract Copyright: © 2025. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Triple lens microlensing - Gravitational microlensing - Gravitational microlensing exoplanet detection

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

Simbad objects: 16

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Number of rows : 16
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 * 47 UMa PM* 10 59 27.9727514012 +40 25 48.920572724   5.66   4.7   G1-VFe-0.5 824 1
2 OGLE-2012-BLG-0026 * 17 34 18.7004610096 -27 08 33.867112596           ~ 55 1
3 OGLE-2013-BLG-0723 BD? 17 34 40.51 -27 26 53.2           ~ 23 0
4 OGLE-2019-BLG-0468 * 17 45 37.44 -24 26 50.2           G 14 0
5 KMT-2021-BLG-1077 * 17 45 57.390 -33 50 34.12           ~ 13 0
6 OGLE-2006-BLG-109 * 17 52 34.55 -30 05 15.7     19.035   16.643 ~ 94 2
7 MOA 2018-BLG-182 * 17 56 03.36 -29 04 58.4           ~ 26 0
8 MACHO 97-BLG-41 ** 17 56 20.7 -28 47 42           ~ 58 1
9 KMT-2022-BLG-1818c Pl 18 03 11.670 -27 28 52.00           ~ 1 0
10 KMT-2022-BLG-1818 * 18 03 11.670 -27 28 52.00           ~ 2 0
11 KMT-2022-BLG-1818b Pl 18 03 11.670 -27 28 52.00           ~ 1 0
12 KMT-2021-BLG-0322 * 18 03 38.800 -29 36 15.80           ~ 6 0
13 MOA 2007-BLG-379 ** 18 05 24.43 -26 25 18.8           ~ 58 1
14 KMT-2020-BLG-0414 * 18 07 39.60 -28 29 06.8           ~ 24 0
15 Kepler-539 Er* 19 56 29.3871979920 +41 52 00.317369676   13.150 12.519 12.342   G2V 82 0
16 NAME Galactic Bulge reg ~ ~           ~ 4794 0

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