2023A&A...675A..71H

Query : 2023A&A...675A..71H

2023A&A...675A..71H - Astronomy and Astrophysics, volume 675A71 (2023/7-1)

Probable brown dwarf companions detected in binary microlensing events during the 2018-2020 seasons of the KMTNet survey.

HAN C., JUNG Y.K., KIM D., GOULD A., BOZZA V., BOND I.A., CHUNG S.-J., ALBROW M.D., HWANG K.-H., RYU Y.-H., SHIN I.-G., SHVARTZVALD Y., YANG H., ZANG W., CHA S.-M., KIM D.-J., KIM H.-W., KIM S.-L., LEE C.-U., LEE D.-J., YEE J.C., LEE Y., PARK B.-G., POGGE R.W., ABE F., BARRY R., BENNETT D.P., BHATTACHARYA A., FUJII H., FUKUI A., HIRAO Y., ISHITANI SILVA S., 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., SUMI T., SUZUKI D., TODA T., TRISTRAM P.J., VANDOROU A., YAMA H. and ITOW Y.

Abstract (from CDS):

Aims. We inspect the microlensing data of the KMTNet survey collected during the 2018-2020 seasons in order to find lensing events produced by binaries with brown dwarf (BD) companions.
Methods. In order to pick out binary-lens events with candidate BD lens companions, we conducted systematic analyses of all anomalous lensing events observed during the seasons from 2018 to 2020. By applying a selection criterion of mass ratio between the lens components of 0.03 ≲ q ≲ 0.1, we identify four binary-lens events with candidate BD companions, namely KMT-2018-BLG-0321, KMT-2018-BLG-0885, KMT-2019-BLG-0297, and KMT-2019-BLG-0335. For the individual events, we present interpretations of the lens systems and measure the observables that can be used to constrain the physical lens parameters.
Results. The masses of the lens companions estimated from the Bayesian analyses based on the measured observables indicate high probabilities that the lens companions are in the BD mass regime; that is, 59%, 68%, 66%, and 66% for the four respective events.

Abstract Copyright: © The Authors 2023

Journal keyword(s): gravitational lensing: micro - brown dwarfs

Simbad objects: 15

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Number of rows : 15
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 OGLE-2017-BLG-0614 Lev 17 26 08.080 -30 17 46.14           ~ 4 0
2 OGLE-2016-BLG-0890 Lev 17 30 25.690 -29 50 48.98           ~ 5 0
3 KMT-2019-BLG-0335 ** 17 31 21.72580320 -29 35 27.0050640           ~ 3 0
4 OGLE-2017-BLG-0896 * 17 39 30.98 -27 17 51.1           ~ 11 0
5 KMT-2018-BLG-0321 ** 17 41 36.4150836401 -22 09 52.530961619           ~ 3 0
6 KMT-2018-BLG-0357 Lev 17 44 12.200 -33 36 23.18           ~ 4 0
7 OGLE-2018-BLG-1489 Lev 17 45 46.600 -23 57 43.85           ~ 4 0
8 NAME EWS 2005-BLG-071b Pl 17 50 09.77 -34 40 23.5           ~ 52 1
9 OGLE-2018-BLG-0360 Lev 17 52 01.260 -31 08 54.71           ~ 4 0
10 KMT-2018-BLG-0885 ** 17 55 51.9015285072 -28 30 47.234523168           ~ 3 0
11 MOA 2019-BLG-131 ** 18 00 15.190 -28 57 55.01           ~ 3 0
12 NAME Baade Window reg 18 03.5 -30 01           ~ 643 3
13 KMT-2017-BLG-1757 Lev 18 05 50.000 -27 04 38.50           ~ 4 0
14 KMT-2020-BLG-0414b Pl? 18 07 39.60 -28 29 06.8           ~ 12 0
15 NAME Galactic Bulge reg ~ ~           ~ 4794 0

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