2024PASP..136e4402B

Query : 2024PASP..136e4402B

2024PASP..136e4402B - Publ. Astron. Soc. Pac., 136, part no 5, 4402 (2024/May-0)

KMT-2023-BLG-1431Lb: A New q < 10–4 Microlensing Planet from a Subtle Signature.

BELL A., ZHANG J., ZANG W., JUNG Y.K., YEE J.C., YANG H., SUMI T., UDALSKI A. (The Leading Authors), ALBROW M.D., CHUNG S.-J., GOULD A., HAN C., HWANG K.-H., RYU Y.-H., SHIN I.-G., SHVARTZVALD Y., 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), TANG Y., McCORMICK J., DONG S., LIU Z., DE ALMEIDA L., MAO S., MAOZ D., ZHU W. (The MAP & μFUN Follow-up Team), 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., LMSCHENK 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), MROZ P., SKOWRON J., POLESKI R., SZYMANSKI M.K., SOSZYNSKI I., PIETRUKOWICZ P., KOZLOWSKI S., ULACZYK K., RYBICKI K.A., IWANEK P., WRONA M., GROMADZKI M. (The OGLE Collaboration)

Abstract (from CDS):

The current studies of microlensing planets are limited by small number statistics. Follow-up observations of high-magnification microlensing events can efficiently form a statistical planetary sample. Since 2020, the Korea Microlensing Telescope Network (KMTNet) and the Las Cumbres Observatory (LCO) global network have been conducting a follow-up program for high-magnification KMTNet events. Here, we report the detection and analysis of a microlensing planetary event, KMT-2023-BLG-1431, for which the subtle (0.05 mag) and short-lived (5 hr) planetary signature was characterized by the follow-up from KMTNet and LCO. A binary-lens single-source (2L1S) analysis reveals a planet/host mass ratio of q = (0.72 ± 0.07) × 10–4, and the single-lens binary-source (1L2S) model is excluded by Δχ2 = 80. A Bayesian analysis using a Galactic model yields estimates of the host star mass of ${M}_{\mathrm{host}}={0.57}_{-0.29}^{+0.33}\,{M}_{\odot }$, the planetary mass of ${M}_{\mathrm{planet}}={13.5}_{-6.8}^{+8.1}\,{M}_{\oplus }$, and the lens distance of ${D}_{{\rm{L}}}={6.9}_{-1.7}^{+0.8}$ kpc. The projected planet-host separation of ${a}_{\perp }={2.3}_{-0.5}^{+0.5}$ au or ${a}_{\perp }={3.2}_{-0.8}^{+0.7}$ au, subject to the close/wide degeneracy. We also find that without the follow-up data, the survey-only data cannot break the degeneracy of central/resonant caustics and the degeneracy of 2L1S/1L2S models, showing the importance of follow-up observations for current microlensing surveys.

Abstract Copyright: © 2024. The Astronomical Society of the Pacific. All rights reserved.

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

Simbad objects: 9

goto Full paper

goto View the references in ADS

Number of rows : 9
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-071b Pl 17 50 09.77 -34 40 23.5           ~ 52 1
2 OGLE-2018-BLG-0677 * 17 55 00.270 -32 00 59.51           ~ 15 0
3 MOA 2016-BLG-350 BD? 17 55 23.50 -30 12 26.1           ~ 41 0
4 KMT-2021-BLG-0171 Lev 17 56 58.180 -30 05 34.58           ~ 9 0
5 KMT-2023-BLG-1431 Lev 18 04 44.050 -29 44 38.11           ~ 2 0
6 KMT-2023-BLG-1431b Pl? 18 04 44.050 -29 44 38.11           ~ 1 0
7 KMT-2020-BLG-0414b Pl? 18 07 39.60 -28 29 06.8           ~ 12 0
8 MOA 2010-BLG-311 * 18 08 49.980 -25 57 04.27           ~ 15 0
9 NAME Galactic Bulge reg ~ ~           ~ 4794 0

To bookmark this query, right click on this link: simbad:objects in 2024PASP..136e4402B and select 'bookmark this link' or equivalent in the popup menu