2025AJ....169..295Y

Query : 2025AJ....169..295Y

2025AJ....169..295Y - Astron. J., 169, 295 (2025/June-0)

Systematic Reanalysis of KMTNet Microlensing Events. II. Two New Planets in Giant-source Events.

YANG H., YEE J.C., ZHANG J., LEE C.-U., KIM D.-J., BOND I.A., UDALSKI A., HWANG K.-H., ZANG W., QIAN Q., GOULD A., MAO S. (The Leading Authors), ALBROW M.D., CHUNG S.-J., HAN C., JUNG Y.K., RYU Y.-H., SHIN I.-G., SHVARTZVALD Y., CHA S.-M., KIM H.-W., KIM S.-L., LEE D.-J., LEE Y., PARK B.-G., POGGE R.W. (The KMTNet Collaboration), ABE F., BANDO K., BENNETT D.P., BHATTACHARYA A., FUKUI A., HAMADA R., HAMADA S., HAMASAKI N., HIRAO Y., ISHITANI SILVA S., ITOW Y., KOSHIMOTO N., MATSUBARA Y., MIYAZAKI S., MURAKI Y., NAGAI T., NUNOTA K., OLMSCHENK G., RANC C., RATTENBURY N.J., SATOH Y., SUMI T., SUZUKI D., TERRY S.K., TRISTRAM P.J., VANDOROU A., YAMA H. (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. (The OGLE Collaboration)

Abstract (from CDS):

In this work, we continue to apply the updated KMTNet tender-love care photometric pipeline to historical microlensing events. We apply the pipeline to a subsample of events from the KMTNet database, which we refer to as the giant source sample. Leveraging the improved photometric data, we conduct a systematic search for anomalies within this sample. The search successfully uncovers four new planet-like anomalies and recovers two previously known planetary signals. After detailed analysis, two of the newly discovered anomalies are confirmed as clear planets: KMT-2019-BLG-0578 and KMT-2021-BLG-0736. Their planet-to-host mass ratios are q ∼ 4 × 10–3 and q ∼ 1 × 10–4, respectively. Another event, OGLE-2018-BLG-0421 (KMT-2018-BLG-0831), remains ambiguous. Both a stellar companion and a giant planet in the lens system could potentially explain the observed anomaly. The anomaly signal of the last event, MOA-2022-BLG-038 (KMT-2022-BLG-2342), is attributed to an extra source star. Within this sample, our procedure doubles the number of confirmed planets, demonstrating a significant enhancement in the survey sensitivity.

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

Journal keyword(s): Exoplanets - Photometry - Light curves - Gravitational microlensing - Gravitational microlensing exoplanet detection

Simbad objects: 12

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Number of rows : 12
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-1630 Lev 07 56 43.010 -29 52 39.11           ~ 1 0
2 KMT-2018-BLG-0831 Lev 17 51 58.730 -31 51 58.10           ~ 2 0
3 KMT-2021-BLG-0736 Lev 17 53 17.420 -29 42 44.71           ~ 1 0
4 OGLE-2016-BLG-0007 Lev 17 53 25.45 -29 38 32.1           ~ 6 0
5 2MASS J17544337-2844214 * 17 54 43.3746243771 -28 44 21.394424553           ~ 8 0
6 KMT-2022-BLG-0330 Lev 17 56 15.940 -28 06 16.31           ~ 1 0
7 KMT-2021-BLG-0147 Lev 17 56 53.960 -29 36 45.61           ~ 1 0
8 KMT-2019-BLG-0578 Lev 17 57 56.320 -27 47 41.50           ~ 1 0
9 KMT-2022-BLG-2342 Lev 17 58 04.530 -28 17 16.30           ~ 1 0
10 NAME Baade Window reg 18 03.5 -30 01           ~ 643 3
11 KMT-2019-BLG-2991 Lev 18 06 10.910 -27 29 07.69           ~ 3 0
12 NAME Galactic Bulge reg ~ ~           ~ 4794 0

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