2023MNRAS.522.6055Z

Query : 2023MNRAS.522.6055Z

2023MNRAS.522.6055Z - Mon. Not. R. Astron. Soc., 522, 6055-6069 (2023/July-2)

KMT-2022-BLG-0440Lb: A new q < 10–4 microlensing planet with the central-resonant caustic degeneracy broken.

ZHANG J., ZANG W., JUNG Y.K., YANG H., GOULD A., SUMI T., MAO S., DONG S. (The Leading Authors), ALBROW M.D., CHUNG S.-J., HAN C., HWANG K.-H., RYU Y.-H., SHIN I.-G., SHVARTZVALD Y., YEE J.C., 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), QIAN Q., LIU Z., MAOZ D., PENNY M.T., ZHU W. (The MAP and {mu}FUN Follow-up Teams), ABE F., BARRY R., BENNETT D.P., BHATTACHARYA A., BOND I.A., FUJII H., FUKUI A., HAMADA R., HIRAO Y., ISHITANI SILVA S., ITOW Y., KIRIKAWA R., KONDO I., KOSHIMOTO N., MATSUBARA Y., MATSUMOTO S., MIYAZAKI S., MURAKI Y., OKAMURA A., OLMSCHENK G., RANC C., RATTENBURY N.J., SATOH Y., SUZUKI D., TODA T., TOMOYOSHI M., TRISTRAM P.J., VANDOROU A., YAMA H., YAMASHITA K. (The MOA Collaboration)

Abstract (from CDS):

We present the observations and analysis of a high-magnification microlensing planetary event, KMT-2022-BLG-0440, for which the weak and short-lived planetary signal was covered by both the KMTNet survey and follow-up observations. The binary-lens models with a central caustic provide the best fits, with a planet/host mass ratio, q = 0.75-1.00 × 10–4 at 1σ. The binary-lens models with a resonant caustic and a brown-dwarf mass ratio are both excluded by Δχ2 > 70. The binary-source model can fit the anomaly well but is rejected by the 'colour argument' on the second source. From Bayesian analyses, it is estimated that the host star is likely a K or M dwarf located in the Galactic disc, the planet probably has a Neptune-mass, and the projected planet-host separation is $1.9^{+0.6}_{-0.7}$ or $4.6^{+1.4}_{-1.7}$ au, subject to the close/wide degeneracy. This is the third q < 10–4 planet from a high-magnification planetary signal (A ≳ 65). Together with another such planet, KMT-2021-BLG-0171Lb, the ongoing follow-up program for the KMTNet high-magnification events has demonstrated its ability to detect high-magnification planetary signals for q < 10–4 planets, which are challenging for the current microlensing surveys.

Abstract Copyright: © 2023 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society

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

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 NAME EWS 2005-BLG-390b Pl 17 54 19.2 -30 22 38           ~ 80 1
2 NAME EWS 2018-BLG-0677b Pl? 17 55 00.270 -32 00 59.51           ~ 8 0
3 MOA 2015-BLG-281 BD? 17 55 01.020 -29 02 49.60           ~ 22 0
4 KMT-2021-BLG-0171b Pl? 17 56 58.180 -30 05 34.58           ~ 3 0
5 KMT-2021-BLG-1689b Pl? 17 58 18.620 -30 08 43.12           ~ 2 0
6 KMT-2021-BLG-1689 Lev 17 58 18.620 -30 08 43.12           ~ 6 0
7 KMT-2022-BLG-0440 Lev 17 58 20.060 -32 17 43.12           ~ 6 0
8 KMT-2022-BLG-0440b Pl? 17 58 20.060 -32 17 43.12           ~ 2 0
9 OGLE-2018-BLG-1185 * 17 59 10.26 -27 50 06.3           ~ 7 0
10 MOA 2010-BLG-353 * 18 05 12.940 -27 17 35.64           ~ 12 0
11 NAME EWS 2005-BLG-169b Pl 18 06 05.32 -30 43 57.5           ~ 42 1
12 MOA 2010-BLG-477 * 18 06 07.440 -31 27 16.12           ~ 18 1
13 KMT-2020-BLG-0414 * 18 07 39.60 -28 29 06.8           ~ 24 0
14 MOA 2012-BLG-527 * 18 08 04.62 -29 43 53.7           ~ 28 0
15 OGLE-2019-BLG-0960 * 18 16 03.43 -25 46 28.8           ~ 12 0
16 NAME Galactic Bulge reg ~ ~           ~ 4794 0

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