2022A&A...663A.145H


Query : 2022A&A...663A.145H

2022A&A...663A.145H - Astronomy and Astrophysics, volume 663A, 145-145 (2022/7-1)

KMT-2021-BLG-1898: Planetary microlensing event involved with binary source stars.

HAN C., GOULD A., KIM D., JUNG Y.K., ALBROW M.D., CHUNG S.-J., HWANG K.-H., LEE C.-U., RYU Y.-H., SHIN I.-G., SHVARTZVALD Y., YEE J.C., ZANG W., CHA S.-M., KIM D.-J., KIM S.-L., LEE D.-J., LEE Y., PARK B.-G., POGGE R.W. (The KMTNet Collaboration)

Abstract (from CDS):


Aims. The light curve of the microlensing event KMT-2021-BLG-1898 exhibits a short-term central anomaly with double-bump features that cannot be explained by the usual binary-lens or binary-source interpretations. With the aim of interpreting the anomaly, we analyze the lensing light curve under various sophisticated models.
Methods. We find that the anomaly is explained by a model, in which both the lens and source are binaries (2L2S model). For this interpretation, the lens is a planetary system with a planet/host mass ratio of q ∼ 1.5 x 10–3, and the source is a binary composed of a turn off or a subgiant star and a mid K dwarf. The double-bump feature of the anomaly can also be depicted by a triple-lens model (3L1S model), in which the lens is a planetary system containing two planets. Among the two interpretations, the 2L2S model is favored over the 3L1S model not only because it yields a better fit to the data, by Δχ2 = [14.3-18.5], but also the Einstein radii derived independently from the two stars of the binary source result in consistent values. According to the 2L2S interpretation, KMT-2021-BLG-1898 is the third planetary lensing event occurring on a binary stellar system, following MOA-2010-BLG-117 and KMT-2018-BLG-1743.
Results. Under the 2L2S interpretation, we identify two solutions resulting from the close-wide degeneracy in determining the planet-host separation. From a Bayesian analysis, we estimate that the planet has a mass of ∼0.7-0.8 MJ, and it orbits an early M dwarf host with a mass of ∼0.5 M. The projected planet-host separation is ∼1.9 AU and ∼3.0 AU according to the close and wide solutions, respectively.

Abstract Copyright: © C. Han et al. 2022

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

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 - 2024
#notes
1 OGLE-2012-BLG-0026 * 17 34 18.7004610096 -27 08 33.867112596           ~ 51 1
2 OGLE-2016-BLG-1003 * 17 36 25.23 -27 11 19.9           ~ 8 0
3 2MASS J17424606-2722319 ** 17 42 46.0714267205 -27 22 32.082498230           ~ 6 0
4 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 14383 0
5 OGLE-2006-BLG-109 * 17 52 34.55 -30 05 15.7     19.035   16.643 ~ 87 2
6 KMT-2019-BLG-0797 * 17 53 48.090 -31 58 36.70           ~ 6 0
7 MOA 2018-BLG-182 * 17 56 03.36 -29 04 58.4           ~ 20 0
8 OGLE-2016-BLG-0613 ** 17 57 02.50 -28 06 58.2           ~ 23 0
9 OGLE-2018-BLG-1700 * 17 59 49.45 -28 31 43.1           ~ 21 0
10 OGLE-2019-BLG-1190 * 18 01 29.21 -28 46 37.7           ~ 11 0
11 NAME Baade Window reg 18 03.5 -30 01           ~ 612 3
12 MOA 2007-BLG-379 ** 18 05 24.43 -26 25 18.8           ~ 52 1
13 KMT-2020-BLG-0414 * 18 07 39.60 -28 29 06.8           ~ 13 0
14 MOA 2010-BLG-117 * 18 07 49.670 -25 20 40.69           ~ 14 0
15 KMT-2018-BLG-1743 * 18 17 08.010 -26 21 34.70           ~ 8 0
16 NAME Galactic Bulge reg ~ ~           ~ 4290 0

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